{"id":5382,"date":"2025-03-07T21:30:59","date_gmt":"2025-03-07T12:30:59","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=5382"},"modified":"2026-10-08T15:51:33","modified_gmt":"2026-10-08T06:51:33","slug":"sql-exists","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/sql-exists\/","title":{"rendered":"\u3010SQL\u3011EXISTS\u3068\u306f\uff1fNOT EXISTS\u30fbIN\u3068\u306e\u9055\u3044\u3084\u4f7f\u3044\u65b9\u3092\u5b9f\u4f8b\u3067\u89e3\u8aac"},"content":{"rendered":"<p>SQL\u306eEXISTS\u306f\u3001\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u6761\u4ef6\u306b\u5408\u3046\u30c7\u30fc\u30bf\u304c\u300c\u3042\u308b\u304b\u3069\u3046\u304b\u300d\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u7d5e\u308a\u8fbc\u3080\u305f\u3081\u306e\u53e5\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u57fa\u672c\u306e\u66f8\u304d\u65b9\u3092\u5b9f\u884c\u7d50\u679c\u4ed8\u304d\u3067\u89e3\u8aac\u3057\u305f\u3046\u3048\u3067\u3001NOT EXISTS\u3084IN\u30fbJOIN\u3068\u306e\u9055\u3044\u3001UPDATE\u30fbDELETE\u30fbCASE\u5f0f\u3067\u306e\u4f7f\u3044\u65b9\u307e\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n<div class=\"bgBox\">\n<p><strong>\uff1c\u3053\u306e\u8a18\u4e8b\u306e\u8981\u70b9\uff1e<\/strong><\/p>\n<ul>\n<li>EXISTS\u306f\u3001\u6761\u4ef6\u306b\u5408\u3046\u30c7\u30fc\u30bf\u304c\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u300c\u3042\u308b\u304b\u3069\u3046\u304b\u300d\u3092\u8abf\u3079\u308b\u305f\u3081\u306e\u53e5<\/li>\n<li>\u30b5\u30d6\u30af\u30a8\u30ea\u304c1\u884c\u3067\u3082\u8fd4\u305b\u3070\u300cTRUE\u300d\u30011\u884c\u3082\u8fd4\u3055\u306a\u3051\u308c\u3070\u300cFALSE\u300d\u306b\u306a\u308b<\/li>\n<li>\u53cd\u5bfe\u306b\u300c\u306a\u3044\u30c7\u30fc\u30bf\u300d\u3092\u63a2\u3057\u305f\u3044\u3068\u304d\u306fNOT EXISTS\u3092\u4f7f\u3046<\/li>\n<\/ul>\n<\/div>\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">EXISTS\u53e5\u306e\u6982\u8981\u3068\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n<p><a href=\"https:\/\/techmania.jp\/blog\/sql0001\/\" target=\"_blank\" rel=\"noopener\">SQL<\/a>\u306f\u3001<a href=\"https:\/\/techmania.jp\/blog\/database0001\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9<\/a>\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3057\u305f\u308a\u3001\u8ffd\u52a0\u30fb\u66f4\u65b0\u30fb\u524a\u9664\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306e\u8a00\u8a9e\u3067\u3059\u3002SQL\u306e\u547d\u4ee4\u6587\uff08\u30af\u30a8\u30ea\uff09\u306f\u3001SELECT\u306a\u3069\u306e\u300c\u6587\u300d\u306b\u3001WHERE\u306a\u3069\u306e\u300c\u53e5\u300d\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u66f8\u304d\u307e\u3059\u3002EXISTS\u3082\u53e5\u306e1\u3064\u306a\u306e\u3067\u5358\u72ec\u3067\u306f\u4f7f\u3048\u305a\u3001SELECT\u6587\u306a\u3069\u306e\u4e2d\u3067<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\u30b5\u30d6\u30af\u30a8\u30ea\u300d\u3068\u4e00\u7dd2\u306b\u4f7f\u3044\u307e\u3059<\/span>\u3002<\/p>\n\n\n<h3 id=\"outline__1_1\" class=\"wp-block-heading\">EXISTS\u3068\u306f\uff1f<\/h3>\n\n\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">SQL\u306e\u300cEXISTS\u300d\u3068\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u304b\u5426\u304b\u3092\u8abf\u3079\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u308b\u53e5\u3067\u3059\u3002<br \/>EXISTS\u53e5\u306f\u5fc5\u305a\u30b5\u30d6\u30af\u30a8\u30ea\u3068\u4f75\u7528\u3055\u308c\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u3067<span class=\"c-user01\" style=\"font-weight:bold;\">1\u3064\u4ee5\u4e0a\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3057\u305f\u5834\u5408\u306f\u300cTRUE\u300d<\/span>\u3092\u8fd4\u3057\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u300cFALSE\u300d<\/span>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/span><\/span><\/p>\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c6\u30fc\u30d6\u30eb\u306e\u30ab\u30e9\u30e0\u306b\u5bfe\u3057\u3066\u8907\u96d1\u306a\u6761\u4ef6\u3092\u4ed8\u3051\u3066\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u308a\u51fa\u3059\u5834\u5408\u3001\u305d\u308c\u305e\u308c\u306e\u6761\u4ef6\u306b\u5408\u308f\u305b\u3066SELECT\u6587\u3092\u8907\u6570\u56de\u4f7f\u7528\u3059\u308b\u3068\u3044\u3046\u65b9\u6cd5\u3092\u3068\u308b\u3053\u3068\u3082\u8003\u3048\u3089\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<br \/>\u3067\u3059\u304c\u3001\u81a8\u5927\u306a\u91cf\u306e\u30c6\u30fc\u30d6\u30eb\u30c7\u30fc\u30bf\u306e\u306a\u304b\u304b\u3089\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u3059\u308b\u305f\u3081\u306b\u4f55\u5ea6\u3082\u540c\u3058\u3088\u3046\u306a\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u306e\u306f\u52b9\u7387\u304c\u60aa\u304f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u51e6\u7406\u3082\u91cd\u304f\u306a\u308b\u306e\u3067\u3001\u826f\u3044\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/span><\/span><\/p>\n<p>\u305d\u3093\u306a\u3068\u304d\u3001EXISTS\u53e5\u3092\u4f7f\u7528\u3057\u3066\u6761\u4ef6\u3092\u7d30\u304b\u304f\u7d5e\u308a\u8fbc\u3081\u3070\u3001\u5fc5\u8981\u306a\u60c5\u5831\u3092\u52b9\u7387\u7684\u306b\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">\u306a\u304a\u3001\u6761\u4ef6\u4ed8\u304d\u3067\u51fa\u529b\u3092\u884c\u3046\u5834\u5408\u306fIN\u53e5\u3084JOIN\u53e5\u306a\u3069\u3092\u4f7f\u3046\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u304c\u3001EXISTS\u3092\u4f7f\u3048\u3070\u3088\u308a\u7c21\u5358\u306b\u6761\u4ef6\u4ed8\u304d\u306eSELECT\u6587\u3092\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/span><\/span><\/p>\n<p><strong>\u3010\u4f7f\u7528\u30a4\u30e1\u30fc\u30b8\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30c6\u30fc\u30d6\u30ebA  -- \u5916\u5074\u306eSQL\uff08\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\uff09\nwhere exists (\n\tselect * from \u30c6\u30fc\u30d6\u30ebB  -- EXISTS\u5185\u306eSQL\uff08\u30b5\u30d6\u30af\u30a8\u30ea\uff09\n\twhere \u30c6\u30fc\u30d6\u30ebB.\u5217 = \u30c6\u30fc\u30d6\u30ebA.\u5217  -- \u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u7d10\u3065\u3051\u308b\u6761\u4ef6\n)<\/code><\/pre><\/div>\n\n\n<p>\u300c&#8211;\u300d\u304b\u3089\u884c\u672b\u307e\u3067\u306f\u30b3\u30e1\u30f3\u30c8\u3067\u3001SQL\u3068\u3057\u3066\u306f\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002MySQL\u3067\u306f\u3001<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/comments.html\" target=\"_blank\" rel=\"noopener\">MySQL\u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306e\u30b3\u30e1\u30f3\u30c8\u69cb\u6587<\/a>\u306b\u3042\u308b\u3068\u304a\u308a\u3001\u300c&#8211;\u300d\u306e\u5f8c\u308d\u306b\u534a\u89d2\u30b9\u30da\u30fc\u30b9\u304c\u5fc5\u8981\u3067\u3059\u3002\u307b\u304b\u306e\u8a00\u8a9e\u306e\u611f\u899a\u3067<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\/\/\u300d\u3068\u66f8\u304f\u3068\u69cb\u6587\u30a8\u30e9\u30fc<\/span>\u306b\u306a\u308b\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4e2d\u306b\u300c\u30c6\u30fc\u30d6\u30ebB.\u5217 = \u30c6\u30fc\u30d6\u30ebA.\u5217\u300d\u306e\u3088\u3046\u306a\u7d10\u3065\u3051\u306e\u6761\u4ef6\u3092\u66f8\u304d\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u30c6\u30fc\u30d6\u30ebA\u306e\u884c\u3054\u3068\u306b\u300c\u5bfe\u5fdc\u3059\u308b\u884c\u304c\u30c6\u30fc\u30d6\u30ebB\u306b\u3042\u308b\u304b\u300d\u3092\u8abf\u3079\u308b<\/span>\u306e\u304c\u57fa\u672c\u306e\u5f62\u3067\u3059\u3002<\/p>\n\n<p>EXISTS\u53e5\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u304b\u5426\u304b\u3092\u8abf\u3079\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u5177\u4f53\u7684\u306a\u5024\u3092\u8fd4\u3059\u5fc5\u8981\u306f\u306a\u304f\u3001\u5c11\u306a\u304f\u3068\u30821\u884c\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3042\u3066\u306f\u307e\u308b\u304b\u3069\u3046\u304b\u3067\u300cTRUE\u300d\u307e\u305f\u306f\u300cFALSE\u300d\u3092\u8fd4\u3059\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306eSELECT\u6587\u3067\u306f\u3001\u5177\u4f53\u7684\u306a\u5024\u3067\u306f\u306a\u304f\u3001\u5358\u306b\u300cSELECT *\u300d\u3084\u300cSELECT 1\u300d\u3068\u66f8\u304f\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__1_2\" class=\"wp-block-heading\">\u30b5\u30d6\u30af\u30a8\u30ea\u3068\u306f\uff1f<\/h3>\n\n\n<p>\u300c\u30b5\u30d6\u30af\u30a8\u30ea\u300d\u3068\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u5185\u306b\u30cd\u30b9\u30c8\uff08\u5165\u308c\u5b50\uff09\u3055\u308c\u305f\u30af\u30a8\u30ea<\/span>\u306e\u3053\u3068\u3067\u3059\u3002SQL\u6587\u306e\u4e00\u90e8\u3068\u3057\u3066\u5185\u90e8\u3067\u5b9f\u884c\u3055\u308c\u3001\u305d\u306e\u5b9f\u884c\u7d50\u679c\u3092\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u306b\u63d0\u4f9b\u3057\u307e\u3059\u3002SELECT\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u3088\u304f\u7528\u3044\u3089\u308c\u3001\u65e5\u672c\u8a9e\u3067\u306f\u300c\u526f\u554f\u3044\u5408\u308f\u305b\u300d\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u305f\u30c7\u30fc\u30bf\u306e\u51fa\u529b\u3092\u884c\u3046\u306b\u306f\u300c\u30b5\u30d6\u30af\u30a8\u30ea\u300d\u304c\u6709\u52b9\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u30013000\u4ef6\u306e\u793e\u54e1\u30c7\u30fc\u30bf\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u300c\u5e73\u5747\u5e74\u9f62\u3088\u308a\u3082\u9ad8\u3044\u793e\u54e1\u3060\u3051\u3092\u51fa\u529b\u3059<span style=\"color: #000000;\">\u308b\u300d\u3068\u3044\u3063\u305f\u6761\u4ef6\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u542b\u3093\u3060\u30af\u30a8\u30ea\u306f\u5148\u306b\u30b5\u30d6\u30af\u30a8\u30ea\u304b\u3089\u5b9f\u884c\u3055\u308c\u3001\u305d\u306e\u5b9f\u884c\u7d50\u679c\u3092\u4e00\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u898b\u306a\u3057\u3066\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/span><\/span><\/p>\n<p>\u305f\u3060\u3057\u3001\u3053\u308c\u306f\u30b5\u30d6\u30af\u30a8\u30ea\u304c\u5916\u5074\u306e\u30af\u30a8\u30ea\u306e\u5217\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\u306e\u8a71\u3067\u3059\u3002EXISTS\u3067\u3088\u304f\u4f7f\u3046\u300c\u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u3092\u53c2\u7167\u3059\u308b\u30b5\u30d6\u30af\u30a8\u30ea\u300d\u306f<strong>\u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea<\/strong>\u3068\u547c\u3070\u308c\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5916\u5074\u306e\u30af\u30a8\u30ea\u306e1\u884c\u3054\u3068\u306b\u30b5\u30d6\u30af\u30a8\u30ea\u304c\u8a55\u4fa1\u3055\u308c\u307e\u3059<\/span>\u3002\u304f\u308f\u3057\u3044\u52d5\u304d\u306f\u300cEXISTS\u306e\u4f7f\u7528\u4f8b\u300d\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010where\u53e5\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u8a18\u8ff0\u4f8b\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30c6\u30fc\u30d6\u30ebA\nwhere \u9805\u76ee &gt; (select \u9805\u76ee from \u30c6\u30fc\u30d6\u30ebB where \u6761\u4ef6);<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__1_3\" class=\"wp-block-heading\">\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4f7f\u7528\u4f8b<\/h3>\n\n\n<p><strong>\u3010\u58f2\u308a\u4e0a\u3052\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+------------+--------+\n| \u6c0f\u540d       | \u793e\u54e1\u30b3\u30fc\u30c9 | \u58f2\u4e0a\u984d |\n+------------+------------+--------+\n| \u4f50\u85e4 \u592a\u90ce  | 10001      | 200    |\n| \u9234\u6728 \u6b21\u90ce  | 10002      | 150    |\n| \u9ad8\u6a4b \u4e09\u90ce  | 10003      | 100    |\n+------------+------------+--------+<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u30af\u30a8\u30ea\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select \u6c0f\u540d,\u58f2\u4e0a\u984d from \u58f2\u308a\u4e0a\u3052\nwhere \u58f2\u4e0a\u984d &gt; (select AVG(\u58f2\u4e0a\u984d) from \u58f2\u308a\u4e0a\u3052);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+--------+\n| \u6c0f\u540d       | \u58f2\u4e0a\u984d |\n+------------+--------+\n| \u4f50\u85e4 \u592a\u90ce  | 200    |\n+------------+--------+<\/code><\/pre>\n\n\n<p>\u307e\u305a\u3001(select AVG(\u58f2\u4e0a\u984d) from \u58f2\u308a\u4e0a\u3052) \u306e\u90e8\u5206\u3067<span class=\"c-user01\" style=\"font-weight:bold;\">\u793e\u5185\u5168\u54e1\u306e\u58f2\u4e0a\u984d\u306e\u5e73\u5747\u5024\u3092\u8a08\u7b97<\/span>\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u90e8\u5206\u304c\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u3067<span class=\"c-user01\" style=\"font-weight:bold;\">\u5e73\u5747\u5024\u3088\u308a\u3082\u9ad8\u3044\u58f2\u4e0a\u984d\u3092\u51fa\u3057\u3066\u3044\u308b\u793e\u54e1\u3092\u8868\u793a<\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">SELECT\u6587\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-select\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/ss0.webp\" alt=\"\u3010SQL\u3011\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308bSELECT\u6587\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u790e\u304b\u3089\u89e3\u8aac\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u3011\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308bSELECT\u6587\u306e\u4f7f\u3044\u65b9\u3092\u57fa\u790e\u304b\u3089\u89e3\u8aac<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<div style=\"margin-top:4%;\">\n<a href=\"https:\/\/techmania.jp\/\"><\/a><p style=\"text-align:center; text-decoration:underline black; font-weight:bold;\">\u3042\u306a\u305f\u306e<span style=\"color: red;\">\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6<\/span>\u304c\u5fc5\u305a\u898b\u3064\u304b\u308a\u307e\u3059<br>\u3010\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u5411\u3051\u3011<span style=\"color: red;\">\u9ad8\u53ce\u5165<\/span>\u30fb<span style=\"color: blue;\">\u597d\u5f85\u9047<\/span>\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/p><\/a>\n<\/div>\n<div style=\"text-align:center; margin-top:1%;\"><a href=\"https:\/\/techmania.jp\/\"><img decoding=\"async\" style=\"filter: drop-shadow(0px 0px 3px rgba(0,0,0,0.3)); width:300px;\" alt=\"TECH MANIA \u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\" src=\"https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2024\/01\/fl1.png\"><\/a><\/div>\n<div>\n<a href=\"https:\/\/techmania.jp\/\"><\/a><p style=\"margin-top: 1%;text-align:center; text-decoration:underline black; font-weight:bold;\">\u226b\u307e\u305a\u306f\u7c21\u5358<span style=\"color: blue;\">60<\/span>\u79d2\u3067<span style=\"color: red;\">\u7121\u6599\u304a\u554f\u3044\u5408\u308f\u305b<\/span>\u304b\u3089\u226a<\/p><\/a>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">EXISTS\u306e\u4f7f\u7528\u4f8b<\/h2>\n\n\n<p>\u4f8b\u3068\u3057\u3066\u30011\u3064\u4ee5\u4e0a\u306e\u5546\u54c1\u3092\u8cfc\u5165\u3057\u305f\u30e6\u30fc\u30b6\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   |\n| \u9234\u6728 \u6b21\u90ce  | 100002   |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   |\n+------------+----------+<\/code><\/pre>\n\n\n<p><strong>\u3010\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+----------+--------+\n| \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570 |\n+----------+--------+\n| 100001   | 2      |\n| 100003   | 1      |\n+----------+--------+<\/code><\/pre>\n\n\n<p><strong>\u3010EXISTS\u306e\u30b5\u30f3\u30d7\u30eb\u30af\u30a8\u30ea\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30e6\u30fc\u30b6\nwhere exists (select 1 from \u6ce8\u6587 where \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p><strong>\u30dd\u30a4\u30f3\u30c8\u2460<\/strong><\/p>\n<p>\u300c\u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID\u300d\u300c\u6ce8\u6587.\u30e6\u30fc\u30b6ID\u300d\u3068\u3044\u3046\u8868\u8a18\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u306f\u300c\u30c6\u30fc\u30d6\u30eb\u540d.\u8981\u7d20\u540d\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3001\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u4f55\u306e\u9805\u76ee\u306a\u306e\u304b\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u30dd\u30a4\u30f3\u30c8\u2461<\/strong><\/p>\n<p>\u4e0a\u8a182\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u3001\u3069\u3061\u3089\u306b\u3082\u300c\u30e6\u30fc\u30b6ID\u300d\u304c\u8a18\u5165\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u3067\u53c2\u7167\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u4e0a\u306e\u5024\u304c\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u53c2\u7167\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u4e0a\u306e\u5024\u3068\u4e00\u81f4\u3059\u308b\u5834\u5408\u306b\u300cTRUE\u300d\u3092\u8fd4\u3057\u307e\u3059\u3002\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u306e\u7d10\u3065\u3051\u3092\u3057\u306a\u3044\u3068\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u304c\u8868\u793a\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059<\/span>\u3002<\/p>\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   |\n+------------+----------+<\/code><\/pre>\n\n\n<p>WHERE\u4ee5\u4e0b\u306e\u6761\u4ef6\u304c\u300cTRUE\u300d\u306b\u306a\u308b\u30e6\u30fc\u30b6\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u62bd\u51fa\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30af\u30a8\u30ea\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306e1\u884c\u3054\u3068\u306b\u30b5\u30d6\u30af\u30a8\u30ea\u304c\u8a55\u4fa1\u3055\u308c\u307e\u3059\u30021\u884c\u305a\u3064\u898b\u308b\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u5224\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306e\u884c<\/strong><\/td><td><strong>\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u540c\u3058\u30e6\u30fc\u30b6ID\u306e\u884c\u304c\u3042\u308b\u304b<\/strong><\/td><td><strong>EXISTS\u306e\u7d50\u679c<\/strong><\/td><td><strong>\u51fa\u529b<\/strong><\/td><\/tr><tr><td>\u4f50\u85e4 \u592a\u90ce\uff08100001\uff09<\/td><td>\u3042\u308b\uff08\u6ce8\u6587\u65702\uff09<\/td><td>TRUE<\/td><td>\u51fa\u529b\u3055\u308c\u308b<\/td><\/tr><tr><td>\u9234\u6728 \u6b21\u90ce\uff08100002\uff09<\/td><td>\u306a\u3044<\/td><td>FALSE<\/td><td>\u51fa\u529b\u3055\u308c\u306a\u3044<\/td><\/tr><tr><td>\u9ad8\u6a4b \u4e09\u90ce\uff08100003\uff09<\/td><td>\u3042\u308b\uff08\u6ce8\u6587\u65701\uff09<\/td><td>TRUE<\/td><td>\u51fa\u529b\u3055\u308c\u308b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>EXISTS\u304c\u898b\u3066\u3044\u308b\u306e\u306f<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\u884c\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u300d\u3060\u3051<\/span>\u306a\u306e\u3067\u3001\u6ce8\u6587\u6570\u306e\u5024\uff082\u30841\uff09\u306f\u7d50\u679c\u306b\u5f71\u97ff\u3057\u307e\u305b\u3093\u3002<\/p>\n<p>\u5148\u8ff0\u306e\u30dd\u30a4\u30f3\u30c8\u2461\u3067\u3082\u7d39\u4ecb\u3057\u307e\u3057\u305f\u304c\u3001\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u7d10\u3065\u3051\u308b\u304b\u5426\u304b\u3067\u51fa\u529b\u3055\u308c\u308b\u30c7\u30fc\u30bf\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7d10\u3065\u3051\u3092\u884c\u308f\u306a\u3044\u5834\u5408\u306f\u3001\u30b5\u30d6\u30af\u30a8\u30ea\uff08EXISTS\u306e\u5f8c\u308d\u306b\u66f8\u304b\u308c\u308b\u62ec\u5f27\u306e\u5185\u5074\u306eSQL\u30af\u30a8\u30ea\uff09\u306e\u7d50\u679c\u304c\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306e\u3069\u306e\u884c\u306b\u5bfe\u3057\u3066\u3082\u540c\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u5024\u304c1\u4ef6\u3067\u3082\u5b58\u5728\u3059\u308c\u3070\u3059\u3079\u3066\u306e\u884c\u304c\u51fa\u529b\u3055\u308c\u30011\u4ef6\u3082\u5b58\u5728\u3057\u306a\u3051\u308c\u30701\u884c\u3082\u51fa\u529b\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u3092<strong>\u300c\u5b58\u5728\u5224\u5b9a\u300d<\/strong>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u7d10\u3065\u3051\u3092\u66f8\u304d\u5fd8\u308c\u305f\u30af\u30a8\u30ea\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30e6\u30fc\u30b6\nwhere exists (select 1 from \u6ce8\u6587);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   |\n| \u9234\u6728 \u6b21\u90ce  | 100002   |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   |\n+------------+----------+<\/code><\/pre>\n\n\n<p>\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u884c\u304c1\u4ef6\u3067\u3082\u3042\u308c\u3070\u5e38\u306b\u300cTRUE\u300d\u306b\u306a\u308b\u305f\u3081\u3001\u6ce8\u6587\u3057\u3066\u3044\u306a\u3044\u9234\u6728\u3055\u3093\u307e\u3067\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u300c\u8cfc\u5165\u3057\u305f\u30e6\u30fc\u30b6\u3060\u3051\u3092\u51fa\u3057\u305f\u3044\u306e\u306b\u5168\u54e1\u8868\u793a\u3055\u308c\u308b\u300d\u3068\u304d\u306f\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4e2d\u306b<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID\u300d\u306e\u6761\u4ef6\u304c\u3042\u308b\u304b<\/span>\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u4e00\u65b9\u3067\u3001\u7d10\u3065\u3051\u3092\u884c\u3046\u5834\u5408\u306f\u3001\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u306e1\u884c\u3054\u3068\u306b\u3001\u305d\u306e\u884c\u306e\u5024\u3092\u4f7f\u3063\u3066\u30b5\u30d6\u30af\u30a8\u30ea\u304c\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3092<strong>\u300c\u76f8\u95a2\u526f\u554f\u5408\u305b\uff08\u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\uff09\u300d<\/strong>\u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u300cselect 1\u300d\u3084\u300cselect *\u300d\u306e\u610f\u5473<\/h3>\n\n\n<p>EXISTS\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u306f\u3001\u5177\u4f53\u7684\u306a\u5024\u3067\u306f\u306a\u304f\u30011\u3064\u4ee5\u4e0a\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u304b\u5426\u304b\u3060\u3051\u304c\u4f7f\u308f\u308c\u307e\u3059\u3002SELECT\u306e\u5f8c\u308d\u306b\u306f\u4f55\u304b\u3057\u3089\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u4f55\u3092\u66f8\u3044\u3066\u3082\u7d50\u679c\u306f\u5909\u308f\u3089\u306a\u3044<\/span>\u305f\u3081\u3001\u300c*\u300d\u3084\u300c1\u300d\u3092\u4f7f\u3046\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u4e0a\u306e\u30b5\u30f3\u30d7\u30eb\u30af\u30a8\u30ea\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u300cselect &#8216;ABC&#8217; from \u6ce8\u6587 where \u2026\u300d\u306e\u3088\u3046\u306b\u56fa\u5b9a\u306e\u6587\u5b57\u5217\u306b\u5909\u3048\u3066\u3082\u3001\u7d50\u679c\u306f\u540c\u3058\u4f50\u85e4\u3055\u3093\u3068\u9ad8\u6a4b\u3055\u3093\u306e2\u884c\u3067\u3059\u3002<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/exists-and-not-exists-subqueries.html\" target=\"_blank\" rel=\"noopener\">MySQL\u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306eEXISTS\u306e\u30da\u30fc\u30b8<\/a>\u3067\u3082\u3001EXISTS\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u306eSELECT\u30ea\u30b9\u30c8\u306f\u7121\u8996\u3055\u308c\u308b\u305f\u3081\u9055\u3044\u306f\u306a\u3044\u3068\u8aac\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u300c*\u300d\u3068\u300c1\u300d\u306e\u3069\u3061\u3089\u3092\u4f7f\u3046\u304b\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u30c1\u30fc\u30e0\u306e\u66f8\u304d\u65b9\u306b\u5408\u308f\u305b\u308c\u3070\u554f\u984c\u3042\u308a\u307e\u305b\u3093<\/span>\u3002<\/p>\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">EXISTS\u53e5\u306f\u3069\u3046\u3044\u3046\u3068\u304d\u306b\u4f7f\u3046\u3068\u4fbf\u5229\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SQL\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u3001\u5b9f\u969b\u306bEXISTS\u53e5\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u30b1\u30fc\u30b9\u306e\u4f8b\u3092\u6319\u3052\u3066\u307f\u307e\u3057\u305f\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">EXISTS\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u300d\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u7d5e\u308a\u8fbc\u307f\u305f\u3044<\/span>\u30b1\u30fc\u30b9\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<ul>\n<li>\u300c\u30e6\u30fc\u30b6\u300d\u306e\u3046\u3061\u5c11\u306a\u304f\u3068\u30821\u3064\u306e\u5546\u54c1\u3092\u8cfc\u5165\u3057\u305f\u300c\u30e6\u30fc\u30b6\u300d\u3092\u51fa\u529b\u3057\u305f\u3044<\/li>\n<li>\u300c\u793e\u54e1\u30c7\u30fc\u30bf\u300d\u306e\u3046\u3061\u3001\u300c\u90e8\u7f72\u30c7\u30fc\u30bf\u300d\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u90e8\u7f72\u306b\u6240\u5c5e\u3057\u3066\u3044\u308b\u300c\u793e\u54e1\u30ec\u30b3\u30fc\u30c9\u300d\u3092\u51fa\u529b\u3057\u305f\u3044<\/li>\n<li>\u300c\u4f01\u696d\u30c7\u30fc\u30bf\u300d\u306e\u3046\u3061\u3001\u300c\u6c42\u4eba\u30c7\u30fc\u30bf\u300d\u306b\u300c\u30ab\u30c6\u30b4\u30ea\u30fc\u300d\u304c\u300cIT\u300d\u306e\u6c42\u4eba\u30921\u4ef6\u4ee5\u4e0a\u63b2\u8f09\u3057\u3066\u3044\u308b\u300c\u4f01\u696d\u30ec\u30b3\u30fc\u30c9\u300d\u3092\u51fa\u529b\u3057\u305f\u3044<\/li>\n<li>\u300c\u793e\u54e1\u30c7\u30fc\u30bf\u300d\u3068\u300c\u90e8\u7f72\u30c7\u30fc\u30bf\u300d\u306e\u3046\u3061\u3001\u300c\u793e\u54e1\u30c7\u30fc\u30bf\u300d\u306e\u300cID\u300d\u3068\u300c\u90e8\u7f72\u30c7\u30fc\u30bf\u300d\u306e\u300c\u793e\u54e1ID\u300d\u304c\u4e00\u81f4\u3057\u3001\u4e14\u3064\u3001\u300c\u90e8\u7f72\u30b3\u30fc\u30c9\u300d\u304c\u300c3\u300d\u306e\u300c\u793e\u54e1\u30ec\u30b3\u30fc\u30c9\u300d\u3092\u51fa\u529b\u3057\u305f\u3044<\/li>\n<\/ul>\n\n<p>\u5b9f\u969b\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u5834\u9762\u3067\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<\/strong><\/p>\n<p>\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001EXISTS\u53e5\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u300c\u5728\u5eab\u30c6\u30fc\u30d6\u30eb\u300d\u306e\u3046\u3061\u3001\u8a72\u5f53\u3059\u308b\u5546\u54c1\u5728\u5eab\u304c1\u3064\u4ee5\u4e0a\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u30c7\u30fc\u30bf\u5206\u6790<\/strong><\/p>\n<p>\u30c7\u30fc\u30bf\u5206\u6790\u3067\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u308b\u306e\u306bEXISTS\u53e5\u304c\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u300c\u5546\u54c1\u8cfc\u5165\u30c6\u30fc\u30d6\u30eb\u300d\u5bfe\u8c61\u306e\u671f\u9593\u3067\u7279\u5b9a\u306e\u5546\u54c1\u3092\u8cfc\u5165\u3057\u305f\u30e6\u30fc\u30b6\u3092\u8abf\u3079\u308b\u3068\u3044\u3063\u305f\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">NOT EXISTS\u53e5\u3068\u306f\uff1f<\/h2>\n\n\n<p>NOT EXISTS\u53e5\u3068\u306f\u3001EXISTS\u53e5\u3068\u53cd\u5bfe\u306e\u6a5f\u80fd\u3092\u6301\u3061\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u300cTRUE\u300d\u3092\u8fd4\u3057\u3001\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u300cFALSE\u300d\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u300c\u4e00\u5ea6\u3082\u6ce8\u6587\u3057\u3066\u3044\u306a\u3044\u30e6\u30fc\u30b6\u300d\u300c\u307e\u3060\u4e00\u5ea6\u3082\u4f7f\u308f\u308c\u3066\u3044\u306a\u3044\u30c7\u30fc\u30bf\u300d\u306e\u3088\u3046\u306b\u3001<strong>\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u5fdc\u3059\u308b\u884c\u304c1\u4ef6\u3082\u306a\u3044\u30ec\u30b3\u30fc\u30c9<\/strong>\u3092\u63a2\u3057\u305f\u3044\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">NOT EXISTS\u306e\u4f7f\u7528\u4f8b<\/h3>\n\n\n<p><strong>\u3010\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   |\n| \u9234\u6728 \u6b21\u90ce  | 100002   |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   |\n+------------+----------+<\/code><\/pre>\n\n\n<p><strong>\u3010\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+----------+--------+\n| \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570 |\n+----------+--------+\n| 100001   | 2      |\n| 100003   | 1      |\n+----------+--------+<\/code><\/pre>\n\n\n<p><strong>\u3010NOT EXISTS\u3092\u4f7f\u7528\u3059\u308b\u30af\u30a8\u30ea\u4f8b\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30e6\u30fc\u30b6\nwhere not exists (select 1 from \u6ce8\u6587 where \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u9234\u6728 \u6b21\u90ce  | 100002   |\n+------------+----------+<\/code><\/pre>\n\n\n<p>\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u884c\u304c\u306a\u3044<span class=\"c-user01\" style=\"font-weight:bold;\">\u9234\u6728\u3055\u3093\u3060\u3051\u304c\u300cTRUE\u300d<\/span>\u306b\u306a\u308a\u3001\u51fa\u529b\u3055\u308c\u307e\u3059\u3002EXISTS\u306e\u4f7f\u7528\u4f8b\u3067\u51fa\u529b\u3055\u308c\u305f\u4f50\u85e4\u3055\u3093\u30fb\u9ad8\u6a4b\u3055\u3093\u3068\u306f\u3061\u3087\u3046\u3069\u9006\u306e\u7d50\u679c\u3067\u3059\u3002EXISTS\u3068\u540c\u3058\u304f\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u5185\u306e\u300c\u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID\u300d\u3092\u66f8\u304d\u5fd8\u308c\u308b\u3068\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b1\u4ef6\u3067\u3082\u884c\u304c\u3042\u308c\u3070<span class=\"c-user01\" style=\"font-weight:bold;\">1\u884c\u3082\u51fa\u529b\u3055\u308c\u306a\u304f\u306a\u308b<\/span>\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">EXISTS\u53e5\u3068\u985e\u4f3c\u6587\u6cd5\u306e\u6bd4\u8f03<\/h2>\n\n\n\n<h3 id=\"outline__4_1\" class=\"wp-block-heading\">EXISTS\u3068IN\u306e\u6bd4\u8f03<\/h3>\n\n\n<p>EXISTS\u53e5\u3068IN\u53e5\u306f\u3069\u3061\u3089\u3082\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u6271\u3044\u307e\u3059\u304c\u3001EXISTS\u53e5\u304c\u5b58\u5728\u306e\u6709\u7121\u306e\u307f\u3092\u51fa\u529b\u3059\u308b\u306e\u306b\u5bfe\u3057\u3001IN\u53e5\u306f\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30b3\u30fc\u30c9\u3092\u3059\u3079\u3066\u51fa\u529b\u3057\u3001\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u3067\u5024\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002\u307e\u305f\u3001IN\u53e5\u306f\u30ab\u30e9\u30e0\u540d\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001EXISTS\u53e5\u3067\u306f\u4e0d\u8981\u3067\u3059\u3002EXISTS\u53e5\u306f\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3057\u305f\u6642\u70b9\u3067\u691c\u7d22\u3092\u6253\u3061\u5207\u308b\u305f\u3081\u3001IN\u53e5\u3088\u308a\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u512a\u308c\u3066\u3044\u308b\u3068\u3044\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5177\u4f53\u7684\u306a\u5024\u3092\u6bd4\u8f03\u3059\u308b\u5834\u5408\u306fIN\u53e5<\/span>\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b<span class=\"c-user01\" style=\"font-weight:bold;\">\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u7121\u306e\u307f\u3092\u78ba\u8a8d\u3059\u308b\u5834\u5408\u306bEXISTS\u53e5<\/span>\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u306a\u304a\u3001MySQL 8.0.16\u4ee5\u964d\u3067\u306f\u3001EXISTS\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u306b\u3082IN\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u3068\u540c\u3058\u6700\u9069\u5316\uff08\u30bb\u30df\u7d50\u5408\u3078\u306e\u5909\u63db\uff09\u304c\u9069\u7528\u3055\u308c\u308b\u3068<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/semijoins.html\" target=\"_blank\" rel=\"noopener\">MySQL\u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306e\u6e96\u7d50\u5408\u5909\u63db\u306e\u30da\u30fc\u30b8<\/a>\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u73fe\u5728\u306eMySQL\u3067\u306f\u66f8\u304d\u65b9\u3060\u3051\u3067\u901f\u3055\u304c\u6c7a\u307e\u308b\u3068\u306f\u9650\u3089\u306a\u3044\u305f\u3081\u3001\u901f\u5ea6\u304c\u6c17\u306b\u306a\u308b\u5834\u5408\u306fEXPLAIN\u3067\u5b9f\u884c\u8a08\u753b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u300c\u6ce8\u6587\u3057\u305f\u3053\u3068\u306e\u3042\u308b\u30e6\u30fc\u30b6\u300d\u3092IN\u3067\u66f8\u304f\u3068\u3001\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u7d50\u679c\u306fEXISTS\u306e\u4f7f\u7528\u4f8b\u3068\u540c\u3058\u304f\u3001\u4f50\u85e4\u3055\u3093\u3068\u9ad8\u6a4b\u3055\u3093\u306e2\u884c\u3067\u3059\u3002<\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select * from \u30e6\u30fc\u30b6\nwhere \u30e6\u30fc\u30b6ID in (select \u30e6\u30fc\u30b6ID from \u6ce8\u6587);<\/code><\/pre><\/div>\n\n\n<p>IN\u53e5\u306e\u4f7f\u3044\u65b9\u3084\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u6d3b\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql0004\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/20211110\/iStock-1279561653.jpg\" alt=\"\u3010SQL\u5165\u9580\u3011IN\u53e5\u306e\u4f7f\u3044\u65b9\u3084\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u6d3b\u7528\u65b9\u6cd5\u3092\u89e3\u8aac\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u5165\u9580\u3011IN\u53e5\u306e\u4f7f\u3044\u65b9\u3084\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u6d3b\u7528\u65b9\u6cd5\u3092\u89e3\u8aac<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n<p>\u5426\u5b9a\u5f62\u306e\u300cNOT IN\u300d\u3068\u300cNOT EXISTS\u300d\u306b\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">NULL\u306e\u6271\u3044\u306b\u5927\u304d\u306a\u9055\u3044<\/span>\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u30e6\u30fc\u30b6ID\u304cNULL\u306e\u884c\u304c1\u4ef6\u307e\u304e\u308c\u8fbc\u3093\u3067\u3044\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\uff08\u30e6\u30fc\u30b6ID\u304cNULL\u306e\u884c\u3092\u8ffd\u52a0\uff09\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+----------+--------+\n| \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570 |\n+----------+--------+\n| 100001   | 2      |\n| 100003   | 1      |\n| NULL     | 3      |\n+----------+--------+<\/code><\/pre>\n\n\n<p><strong>\u3010NOT IN\u3068NOT EXISTS\u306e\u6bd4\u8f03\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>-- NOT IN\uff1a1\u884c\u3082\u8fd4\u3089\u306a\u3044\uff08Empty set\uff09\nselect * from \u30e6\u30fc\u30b6\nwhere \u30e6\u30fc\u30b6ID not in (select \u30e6\u30fc\u30b6ID from \u6ce8\u6587);\n\n-- NOT EXISTS\uff1a\u9234\u6728 \u6b21\u90ce\uff08100002\uff09\u304c\u8fd4\u308b\nselect * from \u30e6\u30fc\u30b6\nwhere not exists (select 1 from \u6ce8\u6587 where \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p>NOT IN\u306f\u300c100002\u306f\u3001100001\u3067\u3082100003\u3067\u3082NULL\u3067\u3082\u306a\u3044\u300d\u3068\u3044\u3046\u6bd4\u8f03\u3092\u884c\u3044\u307e\u3059\u3002SQL\u3067\u306fNULL\u3068\u306e\u6bd4\u8f03\u7d50\u679c\u304c\u300cTRUE\u300d\u306b\u3082\u300cFALSE\u300d\u306b\u3082\u306a\u3089\u306a\u3044\uff08\u4e0d\u660e\uff09\u305f\u3081\u3001\u6761\u4ef6\u5168\u4f53\u304c\u300cTRUE\u300d\u306b\u306a\u3089\u305a\u3001\u9234\u6728\u3055\u3093\u3082\u51fa\u529b\u3055\u308c\u307e\u305b\u3093\u3002\u4e00\u65b9\u3001NOT EXISTS\u306f\u300c\u540c\u3058\u30e6\u30fc\u30b6ID\u306e\u884c\u304c\u3042\u308b\u304b\u300d\u3060\u3051\u3092\u898b\u308b\u306e\u3067\u3001NULL\u306e\u884c\u304c\u3042\u3063\u3066\u3082\u671f\u5f85\u3069\u304a\u308a\u306e\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u5217\u306bNULL\u304c\u5165\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">NOT IN\u3067\u306f\u306a\u304fNOT EXISTS\u3092\u4f7f\u3046\u306e\u304c\u5b89\u5168<\/span>\u3067\u3059\u3002NULL\u3092\u542b\u3080\u5834\u5408\u306eNOT IN\u306e\u7d50\u679c\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/www.postgresql.org\/docs\/current\/functions-subquery.html#FUNCTIONS-SUBQUERY-NOTIN\" target=\"_blank\" rel=\"noopener\">PostgreSQL\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306eNOT IN\u306e\u8aac\u660e<\/a>\u3067\u3082\u89e3\u8aac\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>NULL\u306e\u6271\u3044\u65b9\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-null\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/sn0.png\" alt=\"\u3010SQL\u3011NULL\u306e\u6271\u3044\u65b9\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u3011NULL\u306e\u6271\u3044\u65b9\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<h3 id=\"outline__4_2\" class=\"wp-block-heading\">EXISTS\u3068JOIN\u306e\u6bd4\u8f03<\/h3>\n\n\n<p>JOIN\u53e5\u306f\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3057\u30661\u3064\u306e\u7d50\u679c\u3092\u51fa\u529b\u3057\u307e\u3059\u304c\u3001EXISTS\u53e5\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u7d50\u5408\u3092\u3057\u307e\u305b\u3093\u3002\u3088\u3063\u3066\u3001\u7d50\u5408\u7d50\u679c\u5168\u4f53\u3092\u51fa\u529b\u3055\u305b\u308b\u5834\u5408\u306fJOIN\u53e5\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u7121\u306e\u307f\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u306fEXISTS\u53e5\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u7d50\u679c\u306e\u9055\u3044\u304c\u306f\u3063\u304d\u308a\u51fa\u308b\u306e\u306f\u3001\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u4e00\u81f4\u3059\u308b\u884c\u304c\u8907\u6570\u3042\u308b\u3068\u304d\u3067\u3059\u3002\u4f8b\u3068\u3057\u3066\u3001\u4f50\u85e4\u3055\u3093\u304c\u3082\u30461\u56de\u6ce8\u6587\u3057\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u304c\u6b21\u306e3\u884c\u306b\u306a\u3063\u305f\u3068\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\uff08\u4f50\u85e4\u3055\u3093\u306e\u6ce8\u6587\u30921\u884c\u8ffd\u52a0\uff09\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+----------+--------+\n| \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570 |\n+----------+--------+\n| 100001   | 2      |\n| 100003   | 1      |\n| 100001   | 5      |\n+----------+--------+<\/code><\/pre>\n\n\n<p><strong>\u3010INNER JOIN\u3067\u66f8\u3044\u305f\u5834\u5408\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6\u540d, \u6ce8\u6587.\u6ce8\u6587\u6570 from \u30e6\u30fc\u30b6\ninner join \u6ce8\u6587 on \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID\norder by \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID, \u6ce8\u6587.\u6ce8\u6587\u6570;<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+--------+\n| \u30e6\u30fc\u30b6\u540d   | \u6ce8\u6587\u6570 |\n+------------+--------+\n| \u4f50\u85e4 \u592a\u90ce  | 2      |\n| \u4f50\u85e4 \u592a\u90ce  | 5      |\n| \u9ad8\u6a4b \u4e09\u90ce  | 1      |\n+------------+--------+<\/code><\/pre>\n\n\n<p>JOIN\u306f<span class=\"c-user01\" style=\"font-weight:bold;\">\u4e00\u81f4\u3057\u305f\u884c\u306e\u6570\u3060\u3051\u7d50\u679c\u3092\u8fd4\u3059<\/span>\u305f\u3081\u3001\u6ce8\u6587\u304c2\u4ef6\u3042\u308b\u4f50\u85e4\u3055\u3093\u306f2\u884c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u4e00\u65b9\u3001\u540c\u3058\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3066EXISTS\u306e\u4f7f\u7528\u4f8b\u3068\u540c\u3058\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u7d50\u679c\u306f\u4f50\u85e4\u3055\u3093\u3068\u9ad8\u6a4b\u3055\u3093\u306e2\u884c\u306e\u307e\u307e\u3067\u3001\u4f50\u85e4\u3055\u3093\u306f1\u884c\u3057\u304b\u51fa\u529b\u3055\u308c\u307e\u305b\u3093\u3002EXISTS\u306f\u300c\u4e00\u81f4\u3059\u308b\u884c\u304c\u3042\u308b\u304b\u300d\u3060\u3051\u3092\u5224\u5b9a\u3059\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u300c\u6ce8\u6587\u3057\u305f\u3053\u3068\u306e\u3042\u308b\u30e6\u30fc\u30b6\u306e\u4e00\u89a7\u300d\u306e\u3088\u3046\u306b\u3001\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u304c\u4e0d\u8981\u3067\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u91cd\u8907\u3055\u305b\u305f\u304f\u306a\u3044\u5834\u5408\u306fEXISTS\u304c\u5411\u3044\u3066\u3044\u307e\u3059<\/span>\u3002\u6ce8\u6587\u6570\u306e\u3088\u3046\u306b\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u3082\u8868\u793a\u3057\u305f\u3044\u5834\u5408\u306fJOIN\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001NOT EXISTS\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">LEFT JOIN\uff08\u5de6\u5916\u90e8\u7d50\u5408\uff09\u3068\u300cIS NULL\u300d\u306e\u7d44\u307f\u5408\u308f\u305b<\/span>\u3067\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002LEFT JOIN\u3067\u306f\u3001\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u4e00\u81f4\u3059\u308b\u884c\u304c\u306a\u3044\u5834\u5408\u3067\u3082\u5de6\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u884c\u306f\u6b8b\u308a\u3001\u76f8\u624b\u5074\u306e\u5217\u306fNULL\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u6027\u8cea\u3092\u4f7f\u3063\u3066\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u5074\u304cNULL\u306e\u884c\u3060\u3051\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\uff08\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306f\u5143\u306e2\u884c\u306e\u72b6\u614b\u3067\u3059\uff09\u3002<\/p>\n<p><strong>\u3010NOT EXISTS\u3068\u540c\u3058\u7d50\u679c\u306b\u306a\u308bLEFT JOIN\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select \u30e6\u30fc\u30b6.* from \u30e6\u30fc\u30b6\nleft join \u6ce8\u6587 on \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID = \u6ce8\u6587.\u30e6\u30fc\u30b6ID\nwhere \u6ce8\u6587.\u30e6\u30fc\u30b6ID is null;<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u9234\u6728 \u6b21\u90ce  | 100002   |\n+------------+----------+<\/code><\/pre>\n\n\n<p>\u7d50\u679c\u306fNOT EXISTS\u306e\u4f7f\u7528\u4f8b\u3068\u540c\u3058\u3067\u3059\u3002\u3069\u3061\u3089\u3067\u3082\u66f8\u3051\u307e\u3059\u304c\u3001\u300c\u6ce8\u6587\u304c\u5b58\u5728\u3057\u306a\u3044\u30e6\u30fc\u30b6\u300d\u3068\u3044\u3046\u610f\u56f3\u304c\u305d\u306e\u307e\u307e\u8aad\u307f\u53d6\u308c\u308bNOT EXISTS\u306e\u307b\u3046\u304c\u3001\u521d\u5fc3\u8005\u306b\u306f\u5206\u304b\u308a\u3084\u3059\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>JOIN\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-join\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/join0.png\" alt=\"\u3010SQL\u5165\u9580\u3011JOIN\u3067SQL\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\uff08INNER JOIN, OUTER JOIN\uff09\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u5165\u9580\u3011JOIN\u3067SQL\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\uff08INNER JOIN, OUTER JOIN\uff09<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<h3 id=\"outline__4_3\" class=\"wp-block-heading\">EXISTS\u3068\u901a\u5e38\u306e\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u6bd4\u8f03<\/h3>\n\n\n<p>\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f2\u3064\u306e\u5024\u3092\u6bd4\u8f03\u3057\u3066\u51fa\u529b\u3092\u884c\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5024\u540c\u58eb\u3092\u6bd4\u8f03\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u6bd4\u8f03\u6f14\u7b97\u5b50<\/span>\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u7121\u306e\u307f\u3092\u77e5\u308a\u305f\u3044\u5834\u5408\u306fEXISTS\u53e5\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">UPDATE\u6587\u30fbDELETE\u6587\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/h2>\n\n\n<p>\u5b9f\u306f\u3001EXISTS\u3092\u4f7f\u3046\u306e\u306fSELECT\u6587\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u306bUPDATE\u6587\u3084DELETE\u6587\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u8a72\u5f53\u3059\u308b\u30c7\u30fc\u30bf\u306e\u307f\u3092\u66f4\u65b0\u30fb\u524a\u9664\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__5_1\" class=\"wp-block-heading\">UPDATE\u6587\u3067EXISTS\u3092\u4f7f\u3046<\/h3>\n\n\n<p>\u30e1\u30a4\u30f3\u30af\u30a8\u30ea\u306bUPDATE\u6587\u3092\u7528\u3044\u308b\u3068\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u884c\u3060\u3051\u3092\u66f4\u65b0\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u69cb\u6587\u4f8b\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>update \u30c6\u30fc\u30d6\u30eb\u540d set \u30ab\u30e9\u30e0\u540d = \u5024 where exists ( \u30b5\u30d6\u30af\u30a8\u30ea );<\/code><\/pre><\/div>\n\n\n<p>\u3088\u304f\u4f7f\u3046\u306e\u304c\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u300cSET\u53e5\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u5024\u3092\u8a08\u7b97\u3057\u3001WHERE EXISTS\u3067\u66f4\u65b0\u5bfe\u8c61\u3092\u7d5e\u308b\u300d<\/span>\u3068\u3044\u3046\u5f62\u3067\u3059\u3002\u4f8b\u3068\u3057\u3066\u3001\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306b\u300c\u6ce8\u6587\u6570\u5408\u8a08\u300d\u5217\u3092\u8ffd\u52a0\u3057\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u96c6\u8a08\u3057\u305f\u5024\u3092\u66f8\u304d\u8fbc\u3093\u3067\u307f\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\uff08\u6ce8\u6587\u6570\u5408\u8a08\u5217\u3092\u8ffd\u52a0\u3001\u521d\u671f\u5024\u306f0\uff09\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+------------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570\u5408\u8a08 |\n+------------+----------+------------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   | 0          |\n| \u9234\u6728 \u6b21\u90ce  | 100002   | 0          |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   | 0          |\n+------------+----------+------------+<\/code><\/pre>\n\n\n<p>\u307e\u305a\u3001WHERE EXISTS\u3092\u4ed8\u3051\u305a\u306b\u66f4\u65b0\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u3010WHERE EXISTS\u304c\u306a\u3044UPDATE\u6587\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>update \u30e6\u30fc\u30b6\nset \u6ce8\u6587\u6570\u5408\u8a08 = (select sum(\u6ce8\u6587\u6570) from \u6ce8\u6587 where \u6ce8\u6587.\u30e6\u30fc\u30b6ID = \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+------------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570\u5408\u8a08 |\n+------------+----------+------------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   | 2          |\n| \u9234\u6728 \u6b21\u90ce  | 100002   | NULL       |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   | 1          |\n+------------+----------+------------+<\/code><\/pre>\n\n\n<p>WHERE\u53e5\u304c\u306a\u3044\u305f\u3081\u3001\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306e\u5168\u884c\u304c\u66f4\u65b0\u5bfe\u8c61\u306b\u306a\u308a\u307e\u3059\u3002\u6ce8\u6587\u304c\u306a\u3044\u9234\u6728\u3055\u3093\u306f\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u96c6\u8a08\u7d50\u679c\u304cNULL\u306b\u306a\u308a\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5143\u306e0\u304cNULL\u3067\u4e0a\u66f8\u304d<\/span>\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u6ce8\u6587\u304c\u3042\u308b\u30e6\u30fc\u30b6\u3060\u3051\u3092\u66f4\u65b0\u3057\u305f\u3044\u5834\u5408\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">WHERE EXISTS\u3067\u5bfe\u8c61\u3092\u7d5e\u308a\u307e\u3059<\/span>\u3002<\/p>\n<p><strong>\u3010WHERE EXISTS\u3067\u66f4\u65b0\u5bfe\u8c61\u3092\u7d5e\u3063\u305fUPDATE\u6587\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>update \u30e6\u30fc\u30b6\nset \u6ce8\u6587\u6570\u5408\u8a08 = (select sum(\u6ce8\u6587\u6570) from \u6ce8\u6587 where \u6ce8\u6587.\u30e6\u30fc\u30b6ID = \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID)\nwhere exists (select 1 from \u6ce8\u6587 where \u6ce8\u6587.\u30e6\u30fc\u30b6ID = \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+------------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID | \u6ce8\u6587\u6570\u5408\u8a08 |\n+------------+----------+------------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   | 2          |\n| \u9234\u6728 \u6b21\u90ce  | 100002   | 0          |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   | 1          |\n+------------+----------+------------+<\/code><\/pre>\n\n\n<p>\u9234\u6728\u3055\u3093\u306e\u884c\u306f\u66f4\u65b0\u5bfe\u8c61\u304b\u3089\u5916\u308c\u305f\u305f\u3081\u30010\u306e\u307e\u307e\u6b8b\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u6ce8\u6587\u6570\u5408\u8a08\u5217\u306bNOT NULL\u5236\u7d04\u304c\u4ed8\u3044\u3066\u3044\u308b\u5834\u5408\u3001MySQL\u306e\u521d\u671f\u8a2d\u5b9a\uff08<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/sql-mode.html\" target=\"_blank\" rel=\"noopener\">MySQL\u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306eSQL\u30e2\u30fc\u30c9<\/a>\u3067\u8aac\u660e\u3055\u308c\u3066\u3044\u308bSTRICT\u30e2\u30fc\u30c9\uff09\u3067\u306f1\u3064\u76ee\u306eUPDATE\u6587\u306f\u300cERROR 1048 (23000): Column &#8216;\u6ce8\u6587\u6570\u5408\u8a08&#8217; cannot be null\u300d\u3068\u306a\u308a\u3001\u66f4\u65b0\u3055\u308c\u307e\u305b\u3093\u3002\u3069\u3061\u3089\u306e\u5834\u5408\u3082\u3001WHERE EXISTS\u3067\u5bfe\u8c61\u3092\u7d5e\u3063\u3066\u304a\u3051\u3070\u9632\u3052\u307e\u3059\u3002<\/p>\n<p>UPDATE\u6587\u306f\u3001WHERE\u53e5\u306e\u66f8\u304d\u65b9\u3092\u9593\u9055\u3048\u308b\u3068\u610f\u56f3\u3057\u306a\u3044\u884c\u307e\u3067\u5909\u66f4\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002MySQL\u3067\u306f\u5b9f\u884c\u5f8c\u306b\u300cRows matched\uff08\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u305f\u884c\u6570\uff09\u300d\u3068\u300cChanged\uff08\u5b9f\u969b\u306b\u5909\u66f4\u3055\u308c\u305f\u884c\u6570\uff09\u300d\u304c\u8868\u793a\u3055\u308c\u308b\u306e\u3067\u3001\u60f3\u5b9a\u3069\u304a\u308a\u306e\u4ef6\u6570\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002WHERE EXISTS\u3092\u4ed8\u3051\u305fUPDATE\u6587\u3067\u306f\u3001\u3069\u3061\u3089\u30822\uff08\u4f50\u85e4\u3055\u3093\u3068\u9ad8\u6a4b\u3055\u3093\uff09\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>UPDATE\u6587\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-update\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/sql-update0.png\" alt=\"\u3010SQL\u3011UPDATE\u6587\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u89e3\u8aac\uff01\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u6761\u4ef6\u306b\u5408\u308f\u305b\u3066\u66f4\u65b0\u3059\u308b\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u3011UPDATE\u6587\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u89e3\u8aac\uff01\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u6761\u4ef6\u306b\u5408\u308f\u305b\u3066\u66f4\u65b0\u3059\u308b<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<h3 id=\"outline__5_2\" class=\"wp-block-heading\">DELETE\u6587\u3067EXISTS\u3092\u4f7f\u3046<\/h3>\n\n\n<p>DELETE\u6587\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u884c\u3060\u3051\u3092\u524a\u9664\u3067\u304d\u307e\u3059\u3002\u7279\u306bNOT EXISTS\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u300c\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u304c1\u4ef6\u3082\u306a\u3044\u30ec\u30b3\u30fc\u30c9\u300d\u3092\u524a\u9664\u3059\u308b<\/span>\u4f7f\u3044\u65b9\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u4f8b\u3068\u3057\u3066\u3001\u4e00\u5ea6\u3082\u6ce8\u6587\u3057\u3066\u3044\u306a\u3044\u30e6\u30fc\u30b6\u3092\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u524a\u9664\u3057\u307e\u3059\uff08\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306f\u5143\u306e2\u884c\u306e\u72b6\u614b\u3067\u3059\uff09\u3002<\/p>\n<p><strong>\u3010NOT EXISTS\u3092\u4f7f\u3063\u305fDELETE\u6587\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>delete from \u30e6\u30fc\u30b6\nwhere not exists (select 1 from \u6ce8\u6587 where \u6ce8\u6587.\u30e6\u30fc\u30b6ID = \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID);<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u5b9f\u884c\u5f8c\u306e\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u30e6\u30fc\u30b6ID |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | 100001   |\n| \u9ad8\u6a4b \u4e09\u90ce  | 100003   |\n+------------+----------+<\/code><\/pre>\n\n\n<p>\u6ce8\u6587\u304c\u306a\u3044\u9234\u6728\u3055\u3093\u306e1\u884c\u3060\u3051\u304c\u524a\u9664\u3055\u308c\u307e\u3057\u305f\u3002MySQL\u3067\u306f\u5b9f\u884c\u5f8c\u306b\u300cQuery OK, 1 row affected\u300d\u3068\u8868\u793a\u3055\u308c\u3001\u524a\u9664\u3055\u308c\u305f\u884c\u6570\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><span class=\"c-user01\" style=\"font-weight:bold;\">\u524a\u9664\u3057\u305f\u884c\u306f\u5143\u306b\u623b\u305b\u306a\u3044<\/span>\u305f\u3081\u3001\u5b9f\u884c\u524d\u306b\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002\u3053\u306eDELETE\u6587\u306eWHERE\u53e5\u306f\u300cNOT EXISTS\u306e\u4f7f\u7528\u4f8b\u300d\u306eSELECT\u6587\u3068\u540c\u3058\u6761\u4ef6\u306a\u306e\u3067\u3001\u5148\u306b\u305d\u306eSELECT\u6587\u3092\u5b9f\u884c\u3059\u308c\u3070\u3001\u524a\u9664\u3055\u308c\u308b\u884c\uff08\u9234\u6728\u3055\u3093\u306e1\u884c\uff09\u3092\u4e8b\u524d\u306b\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u30b5\u30d6\u30af\u30a8\u30ea\u5185\u306e\u7d10\u3065\u3051\u6761\u4ef6\u3092\u66f8\u304d\u5fd8\u308c\u308b\u3068\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b1\u884c\u3067\u3082\u3042\u308b\u9650\u308a1\u884c\u3082\u524a\u9664\u3055\u308c\u305a\u3001\u9006\u306b\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u304c\u7a7a\u3060\u3068\u30e6\u30fc\u30b6\u5168\u54e1\u304c\u524a\u9664\u3055\u308c\u3066\u3057\u307e\u3046\u70b9\u306b\u3082\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>DELETE\u6587\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-delete\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/sqld00.png\" alt=\"\u3010SQL\u3011\u30c7\u30fc\u30bf\u524a\u9664\u300cDELETE\u6587\u300d\u306e\u4f7f\u3044\u65b9\u3002\u5168\u4ef6\u524a\u9664\u30fb\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u53c2\u7167\u3082\u89e3\u8aac\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">\u3010SQL\u3011\u30c7\u30fc\u30bf\u524a\u9664\u300cDELETE\u6587\u300d\u306e\u4f7f\u3044\u65b9\u3002\u5168\u4ef6\u524a\u9664\u30fb\u8907\u6570\u30c6\u30fc\u30d6\u30eb\u53c2\u7167\u3082\u89e3\u8aac<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">CASE\u5f0f\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SQL\u3067\u6761\u4ef6\u5206\u5c90\u3092\u3059\u308b\u3068\u304d\u306b\u306fCASE\u5f0f\u3092\u4f7f\u3044\u307e\u3059\u304c\u3001\u3053\u306eCASE\u5f0f\u306e\u4e2d\u3067\u3082EXISTS\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u3010\u69cb\u6587\u4f8b\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>case\n    when exists (\u30b5\u30d6\u30af\u30a8\u30ea1) then &#39;\u50241&#39;\n    when exists (\u30b5\u30d6\u30af\u30a8\u30ea2) then &#39;\u50242&#39;\n    ...\n    else &#39;\u4f8b\u5916\u5024&#39;\nend<\/code><\/pre><\/div>\n\n\n<p>CASE\u5f0f\u306f<span class=\"c-user01\" style=\"font-weight:bold;\">\u6700\u5f8c\u306b\u5fc5\u305a\u300cend\u300d\u3092\u66f8\u304d\u307e\u3059<\/span>\u3002WHEN\u306f\u4e0a\u304b\u3089\u9806\u306b\u5224\u5b9a\u3055\u308c\u3001\u6700\u521d\u306b\u300cTRUE\u300d\u306b\u306a\u3063\u305fWHEN\u306e\u5024\u304c\u8fd4\u308a\u307e\u3059\u3002\u3069\u308c\u306b\u3082\u3042\u3066\u306f\u307e\u3089\u306a\u3044\u5834\u5408\u306fELSE\u306e\u5024\u304c\u8fd4\u308a\u307e\u3059\u3002<\/p>\n<p>WHERE\u53e5\u306eEXISTS\u306f\u300c\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u884c\u3060\u3051\u3092\u6b8b\u3059\u300d\u4f7f\u3044\u65b9\u3067\u3057\u305f\u304c\u3001CASE\u5f0f\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5168\u54e1\u3092\u51fa\u529b\u3057\u305f\u3046\u3048\u3067\u300c\u3042\u308a\uff0f\u306a\u3057\u300d\u306e\u5217\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059<\/span>\u3002<\/p>\n<p><strong>\u3010CASE\u5f0f\u3068EXISTS\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30af\u30a8\u30ea\u4f8b\u3011<\/strong><\/p>\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-sql\" data-lang=\"SQL\"><code>select \u30e6\u30fc\u30b6\u540d,\n  case\n    when exists (select 1 from \u6ce8\u6587 where \u6ce8\u6587.\u30e6\u30fc\u30b6ID = \u30e6\u30fc\u30b6.\u30e6\u30fc\u30b6ID) then &#39;\u8cfc\u5165\u3042\u308a&#39;\n    else &#39;\u8cfc\u5165\u306a\u3057&#39;\n  end as \u8cfc\u5165\u72b6\u6cc1\nfrom \u30e6\u30fc\u30b6;<\/code><\/pre><\/div>\n\n\n<p><strong>\u3010\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>+------------+----------+\n| \u30e6\u30fc\u30b6\u540d   | \u8cfc\u5165\u72b6\u6cc1 |\n+------------+----------+\n| \u4f50\u85e4 \u592a\u90ce  | \u8cfc\u5165\u3042\u308a |\n| \u9234\u6728 \u6b21\u90ce  | \u8cfc\u5165\u306a\u3057 |\n| \u9ad8\u6a4b \u4e09\u90ce  | \u8cfc\u5165\u3042\u308a |\n+------------+----------+<\/code><\/pre>\n\n\n<p>\u6ce8\u6587\u306e\u4ef6\u6570\u3084\u6ce8\u6587\u6570\u306b\u306f\u95a2\u4fc2\u306a\u304f\u3001\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b1\u884c\u3067\u3082\u3042\u308c\u3070\u300c\u8cfc\u5165\u3042\u308a\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">CASE\u5f0f\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u3082\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u3061\u3089\u3082\u5408\u308f\u305b\u3066\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"techmania-recirc\">\n<style>\n.techmania-recirc{margin:24px 0;font-family:-apple-system,\"Hiragino Kaku Gothic ProN\",\"Yu Gothic\",sans-serif;}\n.techmania-recirc__label{font-size:14px;color:#333;margin-bottom:8px;font-weight:bold;}\n.techmania-recirc__box{display:flex;align-items:center;gap:16px;border:1px solid #ddd;border-radius:4px;padding:12px 16px;text-decoration:none;transition:background .2s;}\n.techmania-recirc__box:hover{background:#f7f9fc;}\n.techmania-recirc__thumb{width:96px;aspect-ratio:6\/4;object-fit:cover;border-radius:4px;flex-shrink:0;}\n.techmania-recirc__title{color:#2952cc;font-size:15px;line-height:1.6;flex:1;}\n.techmania-recirc__arrow{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:#2952cc;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;}\n<\/style>\n<div class=\"techmania-recirc__label\">\u25bc\u3042\u308f\u305b\u3066\u30c1\u30a7\u30c3\u30af\u25bc<\/div>\n<a class=\"techmania-recirc__box\" href=\"https:\/\/techmania.jp\/blog\/sql-case\/\">\n  <img decoding=\"async\" class=\"techmania-recirc__thumb\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/sqlc00.png\" alt=\"SQL\uff5cCASE\u5f0f\u3067\u6761\u4ef6\u5206\u5c90\u3092\u51e6\u7406\u3059\u308b\u3010SELECT\u53e5\u304b\u3089UPDATE\u53e5\u307e\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3011\" loading=\"lazy\">\n  <span class=\"techmania-recirc__title\">SQL\uff5cCASE\u5f0f\u3067\u6761\u4ef6\u5206\u5c90\u3092\u51e6\u7406\u3059\u308b\u3010SELECT\u53e5\u304b\u3089UPDATE\u53e5\u307e\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3011<\/span>\n  <span class=\"techmania-recirc__arrow\">\u25b6<\/span>\n<\/a>\n<\/div>\n\n\n\n<h2 id=\"outline__7\" class=\"wp-block-heading\">EXISTS\u3092\u4f7f\u3046\u3068\u304d\u306b\u6c17\u3092\u4ed8\u3051\u308b\u3053\u3068\u306f\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u975e\u5e38\u306b\u4fbf\u5229\u306aEXISTS\u53e5\u3067\u3059\u304c\u3001\u30af\u30a8\u30ea\u306e\u4e2d\u306b\u7d44\u307f\u8fbc\u3080\u969b\u306f\u3044\u304f\u3064\u304b\u6ce8\u610f\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__7_1\" class=\"wp-block-heading\">\u30af\u30a8\u30ea\u3092\u5de5\u592b\u3057\u306a\u3044\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4e0b\u304c\u308a\u3084\u3059\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">EXISTS\u3092\u4f7f\u7528\u3057\u3066\u30ec\u30b3\u30fc\u30c9\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u53c2\u7167\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u7dcf\u30ec\u30b3\u30fc\u30c9\u6570\u306b\u5fdc\u3058\u3066\u6bd4\u8f03\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u3042\u308c\u3070\u305d\u3053\u3067\u51e6\u7406\u306f\u7d42\u4e86\u3057\u307e\u3059\u304c\u3001\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306f\u5168\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u306e\u3067\u3001\u30ec\u30b3\u30fc\u30c9\u6570\u304c\u591a\u304f\u306a\u308c\u3070\u306a\u308b\u307b\u3069\u51e6\u7406\u306f\u9045\u304f\u306a\u308a\u3084\u3059\u3044\u3068\u3044\u3046\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u3092\u53c2\u7167\u3059\u308b\u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u5916\u5074\u306e\u30af\u30a8\u30ea\u306e1\u884c\u3054\u3068\u306b\u8a55\u4fa1\u3055\u308c\u307e\u3059<\/span>\u3002\u4eca\u56de\u306e\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u306f3\u884c\u306a\u306e\u3067\u6c17\u306b\u306a\u308a\u307e\u305b\u3093\u304c\u3001\u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u6570\u5341\u4e07\u884c\u3042\u308b\u3068\u3001\u305d\u306e\u3076\u3093\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u8a55\u4fa1\u56de\u6570\u3082\u5897\u3048\u3066\u9045\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30af\u30a8\u30ea\u3067\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u306f\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u3067\u7d10\u3065\u3051\u306b\u4f7f\u3046\u5217\uff08\u4eca\u56de\u306e\u4f8b\u3067\u306f\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306e\u30e6\u30fc\u30b6ID\uff09\u306b<span class=\"c-user01\" style=\"font-weight:bold;\">\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a<\/span>\u3057\u3001\u5916\u5074\u306e\u30af\u30a8\u30ea\u3082WHERE\u53e5\u3067\u5fc5\u8981\u306a\u884c\u306b\u7d5e\u308a\u8fbc\u3080\u306a\u3069\u306e\u5de5\u592b\u3092\u3059\u308b\u3088\u3046\u306b\u610f\u8b58\u3057\u307e\u3057\u3087\u3046\u3002\u9045\u3044\u3068\u611f\u3058\u305f\u3068\u304d\u306f\u3001EXPLAIN\u3067\u5b9f\u884c\u8a08\u753b\u3092\u78ba\u8a8d\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002EXPLAIN\u306e\u4f7f\u3044\u65b9\u306f<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/ja\/explain.html\" target=\"_blank\" rel=\"noopener\">MySQL\u516c\u5f0f\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u306eEXPLAIN\u306e\u30da\u30fc\u30b8<\/a>\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__7_2\" class=\"wp-block-heading\">EXISTS\u3082\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u8106\u5f31\u6027\u306b\u3064\u306a\u304c\u308b\u5834\u5408\u304c\u3042\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">SQL\u306b\u306f\u300c<strong>SQL\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3<\/strong>\u300d\u3068\u3044\u3046\u30b5\u30a4\u30d0\u30fc\u653b\u6483\u306e\u624b\u6cd5\u304c\u3042\u308a\u3001\u9069\u5207\u306a\u5bfe\u7b56\u3092\u53d6\u3089\u306a\u3044\u3068<span class=\"c-user01\" style=\"font-weight:bold;\">\u6a5f\u5bc6\u60c5\u5831\u306e\u6d41\u51fa\u3084\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u7834\u58ca<\/span>\u3068\u3044\u3063\u305f\u640d\u5bb3\u3092\u53d7\u3051\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">EXISTS\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3082\u4f8b\u5916\u3067\u306f\u306a\u304f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u60c5\u5831\u3092\u5165\u529b\u3059\u308b\u969b\u306f\u8a18\u53f7\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\uff08\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u304a\u3051\u308b\u5404\u7a2e\u8a18\u53f7\u306e\u6587\u5b57\u304c\u6301\u3064\u6a5f\u80fd\u3092\u55aa\u5931\u3055\u305b\u3001\u305f\u3060\u306e\u6587\u5b57\u3068\u8a8d\u8b58\u3055\u305b\u308b\u3088\u3046\u306b\u3059\u308b\u51e6\u7406\uff09\u3057\u305f\u308a\u3001\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u30fc\uff08\u7279\u5b9a\u306e\u8a18\u53f7\u3084\u6587\u5b57\u3092\u4e8b\u524d\u306b\u5165\u308c\u3066\u304a\u304d\u3001\u5b9f\u969b\u306e\u5024\u306f\u305d\u306e\u6587\u5b57\u306b\u3042\u3068\u304b\u3089\u4ee3\u5165\u3059\u308b\u65b9\u6cd5\uff09\u3092\u7528\u3044\u305f\u308a\u3059\u308b\u306a\u3069\u306e\u5bfe\u7b56\u3092\u53d6\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5177\u4f53\u7684\u306a\u5bfe\u7b56\u306f\u3001IPA\uff08\u60c5\u5831\u51e6\u7406\u63a8\u9032\u6a5f\u69cb\uff09\u306e<a href=\"https:\/\/www.ipa.go.jp\/security\/vuln\/websecurity\/sql.html\" target=\"_blank\" rel=\"noopener\">\u300c\u5b89\u5168\u306a\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u4f5c\u308a\u65b9\u300d\u306eSQL\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u306e\u30da\u30fc\u30b8<\/a>\u3067\u3082\u89e3\u8aac\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u306bSQL\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u306b\u3088\u308b\u30b5\u30a4\u30d0\u30fc\u653b\u6483\u306f\u6bce\u5e74\u591a\u304f\u306e\u4f01\u696d\u3067\u767a\u751f\u3057\u3001\u591a\u5927\u306a\u640d\u5bb3\u3092\u4e0e\u3048\u3066\u3044\u308b\u653b\u6483\u624b\u6cd5\u3067\u3059\u3002\u696d\u52d9\u3067SQL\u3092\u4f7f\u3046\u5834\u5408\u306b\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\u3082\u3057\u3063\u304b\u308a\u3068\u610f\u8b58<\/span>\u3057\u3066\u304a\u304d\u305f\u3044\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h2 id=\"outline__8\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n<p>EXISTS\u306f\u3001<span class=\"c-user01\" style=\"font-weight:bold;\">\u30b5\u30d6\u30af\u30a8\u30ea\u304c1\u884c\u4ee5\u4e0a\u8fd4\u3059\u304b\u3069\u3046\u304b\u3060\u3051\u3092\u5224\u5b9a\u3059\u308b<\/span>\u53e5\u3067\u3059\u3002\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4e2d\u3067\u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u7d10\u3065\u3051\u308b\u6761\u4ef6\u3092\u66f8\u304d\u3001\u5916\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306e1\u884c\u3054\u3068\u306b\u300c\u5bfe\u5fdc\u3059\u308b\u884c\u304c\u3042\u308b\u304b\u300d\u3092\u8abf\u3079\u308b\u306e\u304c\u57fa\u672c\u306e\u4f7f\u3044\u65b9\u3067\u3059\u3002\u4f3c\u305f\u66f8\u304d\u65b9\u3068\u306e\u4f7f\u3044\u5206\u3051\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u3084\u308a\u305f\u3044\u3053\u3068<\/strong><\/td><td><strong>\u304a\u3059\u3059\u3081\u306e\u66f8\u304d\u65b9<\/strong><\/td><\/tr><tr><td>\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u3060\u3051\u3092\u53d6\u308a\u51fa\u3057\u305f\u3044<\/td><td>EXISTS<\/td><\/tr><tr><td>\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u304c1\u4ef6\u3082\u306a\u3044\u30ec\u30b3\u30fc\u30c9\u3092\u53d6\u308a\u51fa\u3057\u305f\u3044<\/td><td>NOT EXISTS\uff08NULL\u304c\u3042\u308b\u3068\u7d50\u679c\u304c\u5909\u308f\u308bNOT IN\u3088\u308a\u5b89\u5168\uff09<\/td><\/tr><tr><td>\u6c7a\u307e\u3063\u305f\u5024\u306e\u30ea\u30b9\u30c8\u306b\u542b\u307e\u308c\u308b\u304b\u3067\u7d5e\u308a\u8fbc\u307f\u305f\u3044<\/td><td>IN<\/td><\/tr><tr><td>\u76f8\u624b\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u3082\u4e00\u7dd2\u306b\u8868\u793a\u3057\u305f\u3044<\/td><td>JOIN\uff08\u4e00\u81f4\u3059\u308b\u884c\u306e\u6570\u3060\u3051\u7d50\u679c\u304c\u5897\u3048\u308b\u70b9\u306b\u6ce8\u610f\uff09<\/td><\/tr><tr><td>\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3067\u66f4\u65b0\u30fb\u524a\u9664\u306e\u5bfe\u8c61\u3092\u7d5e\u308a\u305f\u3044<\/td><td>UPDATE\u6587\u30fbDELETE\u6587\u306eWHERE\u53e5\u3067EXISTS \/ NOT EXISTS<\/td><\/tr><tr><td>\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3067\u8868\u793a\u3059\u308b\u5024\u3092\u5909\u3048\u305f\u3044<\/td><td>CASE\u5f0f\u306e\u4e2d\u3067EXISTS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u307e\u305a\u306f\u8a18\u4e8b\u5185\u306e\u30e6\u30fc\u30b6\u30c6\u30fc\u30d6\u30eb\u3068\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u3063\u3066\u3001\u7d10\u3065\u3051\u6761\u4ef6\u3092\u4ed8\u3051\u305f\u5834\u5408\u3068\u5916\u3057\u305f\u5834\u5408\u3067\u7d50\u679c\u304c\u3069\u3046\u5909\u308f\u308b\u304b\u3092\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<h2 id=\"outline__9\" class=\"wp-block-heading\">SQL\u95a2\u9023\u8a18\u4e8b<\/h2>\n\n\n<div class=\"bgBox\">\n<ul>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql0002\/\" target=\"_blank\" rel=\"noopener\">RDB\u3092\u64cd\u4f5c\u3059\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a00\u8a9e<strong>\u300cSQL\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/nosql-notonlysql\/\" target=\"_blank\" rel=\"noopener\">RDB\u4ee5\u5916\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<strong>\u300cNoSQL\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/post-3185\/\" target=\"_blank\" rel=\"noopener\">RDB\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<strong>\u300cMySQL\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/postgresql\/\" target=\"_blank\" rel=\"noopener\">RDB\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<strong>\u300cPostgreSQL\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-server\/\" target=\"_blank\" rel=\"noopener\">RDB\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<strong>\u300cSQL Server\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sqlite\/\" target=\"_blank\" rel=\"noopener\">RDB\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0<strong>\u300cSQLite\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-phpmyadmin\/\" target=\"_blank\" rel=\"noopener\">\u30d6\u30e9\u30a6\u30b6\u4e0a\u3067MySQL\u3092\u7ba1\u7406\u3067\u304d\u308b<strong>\u300cphpMyAdmin\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-select\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308b<strong>\u300cSELECT\u300d<\/strong>\u6587<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-insert\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3059\u308b<strong>\u300cINSERT\u300d<\/strong>\u6587<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-delete\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3059\u308b<strong>\u300cDELETE\u300d<\/strong>\u6587<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-update\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u3092\u66f4\u65b0\u3059\u308b<strong>\u300cUPDATE\u300d<\/strong>\u6587<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-alter-table\/\" target=\"_blank\" rel=\"noopener\">\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b<strong>\u300cALTER TABLE\u300d<\/strong>\u6587<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql0003\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b<strong>\u300cWHERE\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-having\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b<strong>\u300cHAVING\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql0004\/\" target=\"_blank\" rel=\"noopener\">\u8907\u6570\u306e\u62bd\u51fa\u6761\u4ef6\u3092\u307e\u3068\u3081\u308b<strong>\u300cIN\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-distinct\/\" target=\"_blank\" rel=\"noopener\">\u91cd\u8907\u30ec\u30b3\u30fc\u30c9\u3092\u9664\u5916\u3059\u308b<strong>\u300cDISTINCT\u300d<\/strong><\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql0005\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u7bc4\u56f2\u3092\u6307\u5b9a\u3059\u308b<strong>\u300cBETWEEN\u300d<\/strong>\u6f14\u7b97\u5b50<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-exists\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u6761\u4ef6\u3092\u6e80\u305f\u3059\u30ec\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u306e\u6709\u7121\u3092\u8abf\u3079\u308b<strong>\u300cEXISTS\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-count\/\" target=\"_blank\" rel=\"noopener\">\u30ec\u30b3\u30fc\u30c9\u4ef6\u6570\u3092\u53d6\u5f97\u3059\u308b\u96c6\u8a08\u95a2\u6570<strong>\u300cCOUNT\u300d<\/strong>\u95a2\u6570<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-group-by\/\" target=\"_blank\" rel=\"noopener\">\u30ec\u30b3\u30fc\u30c9\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b<strong>\u300cGROUP BY\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-order-by\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u7d50\u679c\u3092\u4e26\u3073\u66ff\u3048\u308b<strong>\u300cORDER BY\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-join\/\" target=\"_blank\" rel=\"noopener\">\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u30c7\u30fc\u30bf\u3092\u7d50\u5408\u3059\u308b<strong>\u300cJOIN\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-inner-join\/\" target=\"_blank\" rel=\"noopener\">\u5185\u90e8\u7d50\u5408<strong>\u300cINNER JOIN\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-union\/\" target=\"_blank\" rel=\"noopener\">\u62bd\u51fa\u7d50\u679c\u3092\u7d71\u5408\u3057\u3066\u8868\u793a\u3059\u308b<strong>\u300cUNION\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-like\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u306e\u66d6\u6627\u691c\u7d22<strong>\u300cLIKE\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-limit\/\" target=\"_blank\" rel=\"noopener\">\u30c7\u30fc\u30bf\u306e\u53d6\u5f97\u4ef6\u6570\u3092\u5236\u9650\u3059\u308b<strong>\u300cLIMIT\u300d<\/strong>\u53e5<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-case\/\" target=\"_blank\" rel=\"noopener\">\u6761\u4ef6\u5206\u5c90\u51e6\u7406<strong>\u300cCASE\u300d<\/strong>\u5f0f<\/a><\/span><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-null\/\" target=\"_blank\" rel=\"noopener\"><strong>\u300cNULL\u300d<\/strong>\u306e\u6271\u3044\u65b9<\/a><\/span><\/li>\n<li><a href=\"https:\/\/techmania.jp\/blog\/sql-primary-key\/\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #000000;\">\u300c\u4e3b\u30ad\u30fc\u300d<\/span><\/strong><span style=\"color: #000000;\">\u3068\u306f\uff1f<\/span><\/a><\/li>\n<li><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-foreign-key\/\" target=\"_blank\" rel=\"noopener\"><strong>\u300c\u5916\u90e8\u30ad\u30fc\u300d<\/strong>\u3068\u306f\uff1f<\/a><\/span><\/li>\n<\/ul>\n<\/div>\n\n\n<h2 id=\"outline__10\" class=\"wp-block-heading\">SQL\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u306b\u306f\u3001\u77e5\u8b58\u3092\u3064\u3051\u306a\u304c\u3089\u5b9f\u969b\u306b\u624b\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u306a\u3069\u3001\u30a4\u30f3\u30d7\u30c3\u30c8\u3068\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u72ec\u5b66\u306e\u5834\u5408\u306f\u3001\u6709\u8b58\u8005\u306b\u8cea\u554f\u304c\u3067\u304d\u305f\u308a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u3082\u3089\u3048\u308b\u3088\u3046\u306a\u74b0\u5883\u304c\u3042\u308b\u3068\u3001\u7406\u89e3\u5ea6\u304c\u6df1\u307e\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3001SQL\u306b\u9650\u3089\u305a\u3001IT\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u969b\u3001\u3069\u3046\u3057\u3066\u3082\u8ab2\u984c\u306b\u3076\u3064\u304b\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7279\u306b\u72ec\u5b66\u3060\u3068\u3001\u308f\u304b\u3089\u306a\u3044\u90e8\u5206\u3092\u30d7\u30ed\u306b\u8cea\u554f\u3067\u304d\u308b\u6a5f\u4f1a\u3092\u78ba\u4fdd\u3057\u306b\u304f\u304f\u3001\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u304c\u7d9a\u304d\u306b\u304f\u3044\u3068\u3044\u3046\u5074\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u72ec\u5b66\u3067\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u81ea\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002\u8cbb\u7528\u306f\u639b\u304b\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u5206\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u3084\u3059\u3044\u3067\u3059\u3002\u3057\u3063\u304b\u308a\u3068\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3057\u3066\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u305f\u3044\u3068\u3044\u3046\u4eba\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306a\u3089\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u304c\u304a\u3059\u3059\u3081\uff01<\/strong><\/span><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/yuudou.png\" class=\"post-img\" alt=\"\" loading=\"lazy\">\n\n\n<p>IT\u30b9\u30ad\u30eb\u9700\u8981\u306e\u9ad8\u307e\u308a\u3068\u3068\u3082\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3082\u5897\u3048\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046\u3079\u304d\u304b\u8ff7\u3063\u3066\u3057\u307e\u3046\u4eba\u3082\u3044\u308b\u3067\u3057\u3087\u3046\u3002\u305d\u3093\u306a\u65b9\u306b\u306f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\uff01\u3053\u308c\u307e\u3067\u591a\u304f\u306eIT\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u80b2\u6210\u30fb\u8f29\u51fa\u3057\u3066\u304d\u305f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3092\u958b\u8b1b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"bgBox\">\n<p><strong>\uff1c\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306e\u7279\u5fb4\uff1e<\/strong><br 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