{"id":7252,"date":"2024-06-14T17:41:28","date_gmt":"2024-06-14T08:41:28","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=7252"},"modified":"2024-08-23T12:44:54","modified_gmt":"2024-08-23T03:44:54","slug":"sql-alter-table","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/sql-alter-table\/","title":{"rendered":"\u3010SQL\u3011ALTER TABLE\u6587\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u7528\u3044\u3066\u89e3\u8aac"},"content":{"rendered":"\n<h2 id=\"outline__1\" class=\"wp-block-heading\">ALTER TABLE\u3068\u306f<\/h2>\n\n\n<p>SQL\u306eALTER TABLE\u6587\u306f\u65e2\u5b58\u306e\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u3092\u5909\u66f4\u3067\u304d\u308b\u30af\u30a8\u30ea\u3067\u3059\u3002\u3053\u306e\u30af\u30a8\u30ea\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u5f93\u5c5e\u7684\u306a\u30b5\u30d6\u30d5\u30a9\u30fc\u30e0\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n<h4 id=\"outline__1_0_1\" class=\"wp-block-heading\">ALTER TABLE\u6587\u3067\u3067\u304d\u308b\u3053\u3068<\/h4>\n\n\n<p>\u30c6\u30fc\u30d6\u30eb\uff0f\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u540d\u79f0\u5909\u66f4<br \/>\u30ab\u30e9\u30e0\u5b9a\u7fa9\u306e\u5909\u66f4<br \/>\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8ffd\u52a0<br \/>\u30ab\u30e9\u30e0 \/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664<\/p>\n<p>\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306f\u3001ALTER TABLE\u6587\u3068\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u6307\u5b9a\u5f8c\u306b\u3001\u6307\u793a\u53e5\u3068\u5909\u66f4\u5185\u5bb9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__1_1\" class=\"wp-block-heading\">\u3010\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3011<\/h3>\n\n\n<p>\u300cALTER TABLE\u300d\u6587\u306e\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u3092\u89e3\u8aac\u3057\u3066\u3044\u304f\u306b\u3042\u305f\u3063\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u3068\u3057\u3066\u300c\u30c6\u30b9\u30c8\uff08test\uff09\u300d\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/p>\n<p><strong>\u300c\u30c6\u30b9\u30c8\uff08test\uff09\u300d\u30c6\u30fc\u30d6\u30eb<\/strong><\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>ID\uff08id\uff09<\/strong><\/td><td><strong><strong>\u6c0f\u540d\uff08name\uff09<\/strong><\/strong><\/td><td><strong><strong>\u6027\u5225\uff08gender\uff09<\/strong><\/strong><\/td><td><strong><strong>\u70b9\u6570\uff08point\uff09<\/strong><\/strong><\/td><\/tr><tr><td>1001<\/td><td>\u79cb\u5c71<\/td><td>\u7537<\/td><td>80<\/td><\/tr><tr><td>1002<\/td><td>\u4e45\u4fdd\u7530<\/td><td>\u5973<\/td><td>100<\/td><\/tr><tr><td>1003<\/td><td>\u4f50\u3005\u6728<\/td><td>\u5973<\/td><td>65<\/td><\/tr><tr><td>1004<\/td><td>\u4f50\u85e4<\/td><td>\u7537<\/td><td>75<\/td><\/tr><tr><td>1005<\/td><td>\u9234\u6728<\/td><td>\u5973<\/td><td>60<\/td><\/tr><tr><td>1006<\/td><td>\u7530\u4e2d<\/td><td>\u7537<\/td><td>90<\/td><\/tr><tr><td>1007<\/td><td>\u571f\u5c4b<\/td><td>\u5973<\/td><td>55<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"margin-top:4%;\"><a href=\"https:\/\/techmania.jp\/\"><p style=\"text-align:center; font-weight:bold; color:black; text-decoration:underline black;\">\u3042\u306a\u305f\u306e\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6\u304c<span style=\"color: red;\">\u5fc5\u305a<\/span>\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><span style=\"color: black;\">\u30fb<\/span><span style=\"color: blue;\">\u597d\u5f85\u9047<\/span><span style=\"color: black;\">\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/span>\n<\/p><\/a>\n<\/div>\n\n<div style=\"text-align:center; margin-top:1%;\"><a href=\"https:\/\/techmania.jp\/\"><img decoding=\"async\" style=\"filter:drop-shadow(0px 0px 2px 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\/02\/stop.png\"><\/a>\n<\/div>\n\n<div style=\"margin-top:0%;\"><a href=\"https:\/\/techmania.jp\/\">\n<p style=\"text-align:center; font-weight:bold; color:black; text-decoration:underline black;\">\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\n<\/p><\/a>\n<\/div>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">\u30c6\u30fc\u30d6\u30eb\uff0f\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u540d\u79f0\u5909\u66f4<\/h2>\n\n\n<p><span style=\"color: #0000ff;\"><span style=\"color: #000000;\">ALTER TABLE\u6587\u306bRENAME\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c6\u30fc\u30d6\u30eb\u540d\uff0f\u30ab\u30e9\u30e0\u540d\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u540d\u79f0\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/span><\/span><\/p>\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u5909\u66f4<\/h3>\n\n\n<p>\u5909\u66f4\u5bfe\u8c61\u306e\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u5f8c\u308d\u306bRENAME TO\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d RENAME TO \u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u540d;<\/code><\/pre>\n\n\n<p>\u305f\u3060\u3001\u8a72\u5f53\u30c6\u30fc\u30d6\u30eb\u3092\u53c2\u7167\u3059\u308b\u30d3\u30e5\u30fc\u3084\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3042\u308b\u5834\u5408\u306f\u305d\u308c\u3089\u306b\u5f71\u97ff\u304c\u3042\u308b\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002ALTER TABLE\u6587\u306e\u5b9f\u884c\u524d\u306b\u5f71\u97ff\u5148\u3092\u78ba\u8a8d\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\u540d\u306e\u5909\u66f4<\/h3>\n\n\n<p>\u5909\u66f4\u5bfe\u8c61\u306e\u30ab\u30e9\u30e0\u540d\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306fRENAME COLUMN\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u30ab\u30e9\u30e0\u540d TO \u65b0\u3057\u3044\u30ab\u30e9\u30e0\u540d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d RENAME COLUMN \u30ab\u30e9\u30e0\u540d TO \u65b0\u3057\u3044\u30ab\u30e9\u30e0\u540d;<\/code><\/pre>\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u3066\u30ab\u30e9\u30e0\u540d\u3092\u5909\u66f4\u3057\u307e\u3059\u3002\u300cID\u300d\u30ab\u30e9\u30e0\u540d\u3092\u300cid\u300d\u304b\u3089\u300cstudent_id\u300d\u306b\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE test RENAME COLUMN id TO student_id;<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Field<\/strong><\/td><td><strong>Type<\/strong><\/td><td><strong>Null<\/strong><\/td><td><strong>Key<\/strong><\/td><td><strong>Default<\/strong><\/td><td><strong>Extra<\/strong><\/td><\/tr><tr><td><strong>student_id<\/strong><\/td><td>int<\/td><td>NO<\/td><td>PRI<\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>name<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>gender<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>point<\/strong><\/td><td>int<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u30ab\u30e9\u30e0\u540d\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>ID\uff08student_id\uff09<\/strong><\/td><td><strong><strong>\u6c0f\u540d\uff08name\uff09<\/strong><\/strong><\/td><td><strong><strong>\u6027\u5225\uff08gender\uff09<\/strong><\/strong><\/td><td><strong><strong>\u70b9\u6570\uff08point\uff09<\/strong><\/strong><\/td><\/tr><tr><td>1001<\/td><td>\u79cb\u5c71<\/td><td>\u7537<\/td><td>80<\/td><\/tr><tr><td>1002<\/td><td>\u4e45\u4fdd\u7530<\/td><td>\u5973<\/td><td>100<\/td><\/tr><tr><td>1003<\/td><td>\u4f50\u3005\u6728<\/td><td>\u5973<\/td><td>65<\/td><\/tr><tr><td>1004<\/td><td>\u4f50\u85e4<\/td><td>\u7537<\/td><td>75<\/td><\/tr><tr><td>1005<\/td><td>\u9234\u6728<\/td><td>\u5973<\/td><td>60<\/td><\/tr><tr><td>1006<\/td><td>\u7530\u4e2d<\/td><td>\u7537<\/td><td>90<\/td><\/tr><tr><td>1007<\/td><td>\u571f\u5c4b<\/td><td>\u5973<\/td><td>55<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"outline__2_3\" class=\"wp-block-heading\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d\u306e\u5909\u66f4<\/h3>\n\n\n<p>\u5909\u66f4\u5bfe\u8c61\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306fRENAME INDEX\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d TO \u65b0\u3057\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d RENAME INDEX \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d TO \u65b0\u3057\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d;<\/code><\/pre>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8ffd\u52a0<\/h2>\n\n\n<p>ALTER TABLE\u6587\u306bADD\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30c6\u30fc\u30d6\u30eb\u306b\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0<\/h3>\n\n\n<p>\u30c6\u30fc\u30d6\u30eb\u306b\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u306fADD COLUMN\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306f\u3001\u8ffd\u52a0\u3059\u308b\u4f4d\u7f6e\u3092\u30af\u30a8\u30ea\u306e\u6700\u5f8c\u306b\u4ed8\u3051\u52a0\u3048\u307e\u3059\u3002\u4f4d\u7f6e\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u5f8c\u308d\u306e\u4f4d\u7f6e\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD COLUMN \u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b;\n\n\/* \u30c6\u30fc\u30d6\u30eb\u306e\u5148\u982d\u306b\u8ffd\u52a0\u3059\u308b\u5834\u5408 *\/\nALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD COLUMN \u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b FIRST;\n\n\/* \u30ab\u30e9\u30e0\u300cid\u300d\u306e\u5f8c\u308d\u306b\u8ffd\u52a0\u3059\u308b\u5834\u5408 *\/\nALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD COLUMN \u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b AFTER id;<\/code><\/pre>\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u3066\u300c\u5408\u5426\uff08pass\/fail\uff09\u300d\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE test ADD COLUMN pass\/fail varchar;<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Field<\/strong><\/td><td><strong>Type<\/strong><\/td><td><strong>Null<\/strong><\/td><td><strong>Key<\/strong><\/td><td><strong>Default<\/strong><\/td><td><strong>Extra<\/strong><\/td><\/tr><tr><td><strong>student_id<\/strong><\/td><td>int<\/td><td>NO<\/td><td>PRI<\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>name<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>gender<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>point<\/strong><\/td><td>int<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>pass\/fail<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u30ab\u30e9\u30e0\u540d\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>ID\uff08id\uff09<\/strong><\/td><td><strong><strong>\u6c0f\u540d\uff08name\uff09<\/strong><\/strong><\/td><td><strong><strong>\u6027\u5225\uff08gender\uff09<\/strong><\/strong><\/td><td><strong><strong>\u70b9\u6570\uff08point\uff09<\/strong><\/strong><\/td><td><strong>\u5408\u5426\uff08pass\/fail\uff09<\/strong><\/td><\/tr><tr><td>1001<\/td><td>\u79cb\u5c71<\/td><td>\u7537<\/td><td>80<\/td><td><\/td><\/tr><tr><td>1002<\/td><td>\u4e45\u4fdd\u7530<\/td><td>\u5973<\/td><td>100<\/td><td><\/td><\/tr><tr><td>1003<\/td><td>\u4f50\u3005\u6728<\/td><td>\u5973<\/td><td>65<\/td><td><\/td><\/tr><tr><td>1004<\/td><td>\u4f50\u85e4<\/td><td>\u7537<\/td><td>75<\/td><td><\/td><\/tr><tr><td>1005<\/td><td>\u9234\u6728<\/td><td>\u5973<\/td><td>60<\/td><td><\/td><\/tr><tr><td>1006<\/td><td>\u7530\u4e2d<\/td><td>\u7537<\/td><td>90<\/td><td><\/td><\/tr><tr><td>1007<\/td><td>\u571f\u5c4b<\/td><td>\u5973<\/td><td>55<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8ffd\u52a0<\/h3>\n\n\n<p>\u30c6\u30fc\u30d6\u30eb\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u5834\u5408\u306fADD INDEX\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u8ffd\u52a0\u3059\u308b\u30ab\u30e9\u30e0\u540d \u5b9a\u7fa9\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD INDEX \u8ffd\u52a0\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d \u5b9a\u7fa9;\n\n\/* \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5148\u982d\u306b\u8ffd\u52a0\u3059\u308b\u5834\u5408 *\/\nALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD COLUMN \u8ffd\u52a0\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d \u5b9a\u7fa9 FIRST;\n\n\/* \u30a4\u30f3\u30c7\u30c3\u30af\u30b9&#91;id]\u306e\u5f8c\u308d\u306b\u8ffd\u52a0\u3059\u308b\u5834\u5408 *\/\nALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d ADD COLUMN \u8ffd\u52a0\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d \u5b9a\u7fa9 AFTER id;<\/code><\/pre>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664<\/h2>\n\n\n<p>\u30ab\u30e9\u30e0\u3092\u524a\u9664\u3059\u308b\u5834\u5408\u306fDROP COLUMN\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u524a\u9664\u3059\u308b\u30ab\u30e9\u30e0\u540d\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n<h3 id=\"outline__4_1\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\u306e\u524a\u9664<\/h3>\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d DROP COLUMN \u30ab\u30e9\u30e0\u540d;<\/code><\/pre>\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u3066\u300c\u6027\u5225\uff08gender\uff09\u300d\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE test DROP COLUMN gender;<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Field<\/strong><\/td><td><strong>Type<\/strong><\/td><td><strong>Null<\/strong><\/td><td><strong>Key<\/strong><\/td><td><strong>Default<\/strong><\/td><td><strong>Extra<\/strong><\/td><\/tr><tr><td><strong>student_id<\/strong><\/td><td>int<\/td><td>NO<\/td><td>PRI<\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>name<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>point<\/strong><\/td><td>int<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u304c\u524a\u9664\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>ID\uff08id\uff09<\/strong><\/td><td><strong><strong>\u6c0f\u540d\uff08name\uff09<\/strong><\/strong><\/td><td><strong><strong>\u70b9\u6570\uff08point\uff09<\/strong><\/strong><\/td><\/tr><tr><td>1001<\/td><td>\u79cb\u5c71<\/td><td>80<\/td><\/tr><tr><td>1002<\/td><td>\u4e45\u4fdd\u7530<\/td><td>100<\/td><\/tr><tr><td>1003<\/td><td>\u4f50\u3005\u6728<\/td><td>65<\/td><\/tr><tr><td>1004<\/td><td>\u4f50\u85e4<\/td><td>75<\/td><\/tr><tr><td>1005<\/td><td>\u9234\u6728<\/td><td>60<\/td><\/tr><tr><td>1006<\/td><td>\u7530\u4e2d<\/td><td>90<\/td><\/tr><tr><td>1007<\/td><td>\u571f\u5c4b<\/td><td>55<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"outline__4_2\" class=\"wp-block-heading\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664<\/h3>\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u524a\u9664\u3059\u308b\u5834\u5408\u306f\u3001DROP INDEX\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u524a\u9664\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d DROP INDEX \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d;<\/code><\/pre>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">\u30ab\u30e9\u30e0\u5b9a\u7fa9\u306e\u5909\u66f4<\/h2>\n\n\n<p>\u30ab\u30e9\u30e0\u306e\u5b9a\u7fa9\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306fMODIFY COLUMN\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b \u5236\u7d04\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d MODIFY COLUMN \u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b \u5236\u7d04;<\/code><\/pre>\n\n\n<p>\u30ab\u30e9\u30e0\u540d\u3068\u5b9a\u7fa9\u306e\u5909\u66f4\u3092\u540c\u6642\u306b\u884c\u3046\u5834\u5408\u306fCHANGE COLUMN\u53e5\u3092\u8a18\u8ff0\u3057\u3001\u7d9a\u3044\u3066\u300c\u30ab\u30e9\u30e0\u540d \u65b0\u3057\u3044\u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b \u5236\u7d04\u300d\u3068\u3044\u3046\u5f62\u5f0f\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE \u30c6\u30fc\u30d6\u30eb\u540d MODIFY COLUMN \u30ab\u30e9\u30e0\u540d \u30c7\u30fc\u30bf\u578b \u5236\u7d04;<\/code><\/pre>\n\n\n<p>\u30b5\u30f3\u30d7\u30eb\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u3066\u300c\u6027\u5225\uff08gender\uff09\u300d\u30ab\u30e9\u30e0\u306e\u5b9a\u7fa9\u3092\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u3010\u5b9f\u884c\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\"><code>ALTER TABLE test MODIFY COLUMN gender int;<\/code><\/pre>\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Field<\/strong><\/td><td><strong>Type<\/strong><\/td><td><strong>Null<\/strong><\/td><td><strong>Key<\/strong><\/td><td><strong>Default<\/strong><\/td><td><strong>Extra<\/strong><\/td><\/tr><tr><td><strong>student_id<\/strong><\/td><td>int<\/td><td>NO<\/td><td>PRI<\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>name<\/strong><\/td><td>varchar<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>gender<\/strong><\/td><td>int<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><tr><td><strong>point<\/strong><\/td><td>int<\/td><td>YES<\/td><td><\/td><td>NULL<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u6307\u5b9a\u3057\u305f\u30ab\u30e9\u30e0\u306e\u5b9a\u7fa9\u304c\u5909\u66f4\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n<h2 id=\"outline__6\" 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\"><span style=\"color: #000000;\">\u62bd\u51fa\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b<strong>\u300cHAVING\u300d<\/strong>\u53e5<\/span><\/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<\/a><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql0004\/\" target=\"_blank\" rel=\"noopener\"><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-substring\/\" target=\"_blank\" rel=\"noopener\">\u6587\u5b57\u5217\u3092\u5207\u308a\u51fa\u3059<strong>\u300cSUBSTRING\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<\/a><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-order-by\/\" target=\"_blank\" rel=\"noopener\"><strong>\u300cORDE<\/strong><\/a><a style=\"color: #000000;\" href=\"https:\/\/techmania.jp\/blog\/sql-order-by\/\" target=\"_blank\" rel=\"noopener\"><strong>R 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__7\" 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\">\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 \/><strong>\u30fb\u305f\u3057\u304b\u306a\u80b2\u6210\u5b9f\u7e3e\u3068\u89aa\u8eab\u306a\u6559\u80b2\u3000\uff5e\u30bb\u30ab\u30f3\u30c9\u30ad\u30e3\u30ea\u30a2\u3092\u5168\u529b\u652f\u63f4\uff5e<\/strong><br \/><strong>\u30fb\u8b1b\u5e2b\u304c\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3000\uff5e\u201c\u672c\u5f53\u201d\u306e\u958b\u767a\u30ce\u30a6\u30cf\u30a6\u3092\u76f4\u306b\u5b66\u3079\u308b\uff5e<\/strong><br \/><strong>\u30fb\u5c02\u5c5e\u8b1b\u5e2b\u304c\u5b66\u7fd2\u3092\u5fb9\u5e95\u30b5\u30dd\u30fc\u30c8\u3000\uff5e\u300c\u308f\u304b\u3089\u306a\u3044\u300d\u3092\u5fb9\u5e95\u89e3\u6c7a\uff5e<\/strong><br \/><strong>\u30fb\u5b9f\u52d9\u30d9\u30fc\u30b9\u3067\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3000\uff5e\u5b9f\u8df5\u7684\u306a\u51dd\u7e2e\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0\uff5e<\/strong><\/p>\n<\/div>\n<p>\u3053\u306e\u3088\u3046\u306a\u7279\u5fb4\u3092\u6301\u3064\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306fIT\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b9\u30bf\u30fc\u30c8\u30e9\u30a4\u30f3\u3068\u3057\u3066\u6700\u9069\u3067\u3059\u3002<br \/>\u8a71\u3092\u805e\u304d\u305f\u3044\u30fb\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u3068\u3044\u3046\u65b9\u306f<a href=\"https:\/\/techmania.jp\/lp\/2\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089<\/a>\u304b\u3089\u304a\u6c17\u8efd\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>","protected":false},"excerpt":{"rendered":"ALTER TABLE\u3068\u306f SQL\u306eALTER TABLE\u6587\u306f\u65e2\u5b58\u306e\u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u3092\u5909\u66f4\u3067\u304d\u308b\u30af\u30a8\u30ea\u3067\u3059\u3002\u3053\u306e\u30af\u30a8\u30ea\u306b\u306f\u3001\u3044\u304f\u3064\u304b\u5f93\u5c5e\u7684\u306a\u30b5\u30d6\u30d5\u30a9\u30fc\u30e0\u304c\u3042\u308a\u307e\u3059\u3002 ALTER TABLE\u6587\u3067\u3067\u304d\u308b\u3053\u3068 \u30c6\u30fc\u30d6\u30eb\uff0f\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u540d\u79f0\u5909\u66f4\u30ab\u30e9\u30e0\u5b9a\u7fa9\u306e\u5909\u66f4\u30ab\u30e9\u30e0\uff0f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u8ffd\u52a0\u30ab\u30e9\u30e0 \/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u524a\u9664 \u30c6\u30fc\u30d6\u30eb\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306f\u3001ALTER TABLE\u6587\u3068\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u540d\u306e\u6307\u5b9a [&hellip;]","protected":false},"author":8,"featured_media":7267,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/at0.png","fifu_image_alt":"\u3010SQL\u3011ALTER 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