{"id":5659,"date":"2023-09-22T17:08:00","date_gmt":"2023-09-22T08:08:00","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=5659"},"modified":"2026-03-19T20:33:15","modified_gmt":"2026-03-19T11:33:15","slug":"sql-case","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/sql-case\/","title":{"rendered":"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"},"content":{"rendered":"

SQL<\/a>\u306eCASE\u5f0f\u306f\u6761\u4ef6\u5206\u5c90\u3092\u884c\u3046\u3068\u304d\u306b\u4f7f\u3044\u307e\u3059\u3002<\/span><\/span>\u6761\u4ef6\u5206\u5c90\u3068\u306f\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u3001\u5b9f\u884c\u3059\u308b\u51e6\u7406\u3092\u5207\u308a\u66ff\u3048\u308b\u4ed5\u7d44\u307f\u306e\u3053\u3068\u3067\u3059\u3002<\/span><\/p>\n

\u672c\u8a18\u4e8b\u3067\u306fCASE\u5f0f\u306e\u6a5f\u80fd\u306b\u3064\u3044\u3066\u5177\u4f53\u4f8b\u3092\u4ea4\u3048\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u4eca\u5f8c\u306eSQL\u5b66\u7fd2\u306e\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n

CASE\u5f0f\u3068\u306f\uff1f<\/h2>\n\n\n

SQL\u306eCASE\u5f0f\u3068\u306f\u3001SELECT\u53e5\u3084UPDATE\u53e5\u306a\u3069\u306eSQL\u6587\u4e2d\u3067\u300c\u6761\u4ef6\u5206\u5c90\u51e6\u7406\u300d\u3092\u884c\u3046\u306e\u306b\u7528\u3044\u3089\u308c\u308b\u30af\u30a8\u30ea\uff08\u547d\u4ee4\u6587\uff09\u3067\u3059\u3002CASE\u5f0f\u306f\u30c7\u30fc\u30bf\u3054\u3068\u306b\u6307\u5b9a\u6761\u4ef6\u306b\u3042\u3066\u306f\u307e\u308b\u304b\u3092\u5224\u5b9a\u3057\u3001\u5224\u5b9a\u7d50\u679c\u306b\u5fdc\u3058\u3066\u7570\u306a\u308b\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002<\/span>CASE\u5f0f\u3092\u4f7f\u3046\u3053\u3068\u3067\u30af\u30a8\u30ea\u306e\u67d4\u8edf\u6027\u304c\u9ad8\u307e\u308a\u3001\u7c21\u5358\u306b\u6761\u4ef6\u5206\u5c90\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u6761\u4ef6\u306b\u5fdc\u3058\u305f\u7d50\u679c\u306e\u53d6\u5f97\u3084\u30c7\u30fc\u30bf\u306e\u52a0\u5de5\u3068\u3044\u3063\u305f\u30c7\u30fc\u30bf\u64cd\u4f5c\u3092\u5bb9\u6613\u306b\u3059\u308b\u975e\u5e38\u306b\u4fbf\u5229\u306a\u6a5f\u80fd\u306a\u306e\u3067\u3001\u3053\u306e\u6a5f\u4f1a\u306b\u305c\u3072\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n

\n<\/a>

\u3042\u306a\u305f\u306e\u3054\u5e0c\u671b\u306b\u6cbf\u3063\u305f\u6848\u4ef6<\/span>\u304c\u5fc5\u305a\u898b\u3064\u304b\u308a\u307e\u3059
\u3010\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u5411\u3051\u3011\u9ad8\u53ce\u5165<\/span>\u30fb\u597d\u5f85\u9047<\/span>\u306e\u6848\u4ef6\u3092\u3054\u7d39\u4ecb<\/p><\/a>\n<\/div>\n

\"TECH<\/a><\/div>\n
\n<\/a>

\u226b\u307e\u305a\u306f\u7c21\u535860<\/span>\u79d2\u3067\u7121\u6599\u304a\u554f\u3044\u5408\u308f\u305b<\/span>\u304b\u3089\u226a<\/p><\/a>\n\n\n\n

<\/p>\n\n\n\n

CASE\u5f0f\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n

CASE\u5f0f\u306f\u3001\u6761\u4ef6\u306b\u5bfe\u3059\u308b\u5224\u5b9a\u7d50\u679c\u306b\u5fdc\u3058\u3066\u52d5\u7684\u306a\u51fa\u529b\u7d50\u679c\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/span>
CASE\u5f0f\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/span><\/span><\/p>\n\n\n

\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/h3>\n\n\n\n
SELECT 1\u307e\u305f\u306f[\u30ab\u30e9\u30e0\u540d]                             \/\/\u3059\u3079\u3066\u307e\u305f\u306f\u7279\u5b9a\u306e\u30ab\u30e9\u30e0\u3092\u53d6\u5f97\n  CASE [\u30ab\u30e9\u30e0\u540d]                                  \/\/[\u30ab\u30e9\u30e0\u540d]\u3092\u5bfe\u8c61\u3068\u3057\u3066\u6761\u4ef6\u5206\u5c90\n      WHEN [\u6761\u4ef6A] THEN [\u51e6\u7406A]       \/\/\u6761\u4ef6A\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u51e6\u7406A\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n      WHEN [\u6761\u4ef6B] THEN [\u51e6\u7406B]       \/\/\u6761\u4ef6B\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u51e6\u7406B\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n      ELSE [\u51e6\u7406C]              \/\/\u4e0a\u8a18\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u306b\u51e6\u7406C\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n  END AS [\uff5e]                            \/\/CASE\u5f0f\u306e\u30ab\u30e9\u30e0\u3092\"\uff5e\"\u3068\u3044\u3046\u30ab\u30e9\u30e0\u540d\u306b\u3059\u308b\nFROM [\u30c6\u30fc\u30d6\u30eb\u540d];                                         \/\/[\u30c6\u30fc\u30d6\u30eb\u540d]\u304b\u3089\u53d6\u5f97<\/pre><\/div>\n\n\n
\u25c6CASE\u5f0f\u306e\u8a18\u8ff0\u30eb\u30fc\u30eb<\/strong><\/p>\n
CASE\u5f0f\u3067\u306f\u300cCASE\u300d\u3068\u300cEND\u300d\u3067\u56f2\u307e\u308c\u305f\u7b87\u6240\u306b\u6761\u4ef6\u5206\u5c90\u3092\u66f8\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u4ee5\u4e0b\u306e\u90e8\u5206\u304c\u6761\u4ef6\u5206\u5c90\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n
WHEN [\u6761\u4ef6] THEN [\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u8868\u793a\u3059\u308b\u5185\u5bb9]\n      ELSE [\u4e0a\u8a18\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u306b\u8868\u793a\u3059\u308b\u5185\u5bb9]<\/pre><\/div>\n\n\n\n
\u6761\u4ef6\u306f\u8907\u6570\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u6700\u521d\u306b\u4e00\u81f4\u3057\u305f\u6761\u4ef6\u306b\u5bfe\u5fdc\u3059\u308b\u7d50\u679c\u3092\u8fd4\u3057\u3001\u305d\u308c\u4ee5\u964d\u306e\u6761\u4ef6\u306f\u8a55\u4fa1\u3055\u308c\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u3069\u306e\u6761\u4ef6\u306b\u3082\u5f53\u3066\u306f\u307e\u3089\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\u306b\u306f\u300cELSE\u300d\u3092\u4f7f\u3044\u307e\u3059\u3002\u30de\u30b9\u30c8\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u7121\u6761\u4ef6\u3067\u300cELSE NULL\u300d\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u3001\u30d0\u30b0\u306e\u767a\u751f\u5143\u306b\u306a\u308a\u304b\u306d\u306a\u3044\u306e\u3067\u3064\u3051\u308b\u306e\u304c\u30d9\u30bf\u30fc\u3067\u3059\u3002<\/p>\n\n\n\n
\u6307\u5b9a\u6761\u4ef6\u306f\u660e\u78ba\u306b\u793a\u3057\u3001\u6307\u5b9a\u6761\u4ef6\u540c\u58eb\u304c\u6392\u4ed6\u7684\u3067\u3042\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u53ef\u8aad\u6027\u304c\u4e0a\u304c\u308a\u3001\u30df\u30b9\u3082\u8d77\u3053\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
WHERE\u53e5\u3084HAVING\u53e5\u3068\u306e\u9055\u3044<\/h2>\n\n\n\n
WHERE\u53e5\u3084HAVING\u53e5\u3067\u3082\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u30c7\u30fc\u30bf\u306e\u7d5e\u308a\u8fbc\u307f\u3092\u884c\u3048\u307e\u3059\u304c\u3001\u51fa\u529b\u7d50\u679c\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u52a0\u3048\u308b\u3068\u3044\u3063\u305f\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u305d\u306e\u70b9\u3001CASE\u5f0f\u3067\u306f\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u3092\u5143\u306b\u4f55\u304b\u3057\u3089\u306e\u51e6\u7406\u3092\u52a0\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u305f\u3068\u3048\u3070\u3001\u30c6\u30b9\u30c8\u306e\u70b9\u6570\u304c60\u70b9\u4ee5\u4e0a\u306e\u751f\u5f92\u306b\u306f\u201d\u5408\u683c\u201d\u300160\u70b9\u672a\u6e80\u306e\u751f\u5f92\u306b\u306f\u201d\u4e0d\u5408\u683c\u201d\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u51fa\u529b\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u5358\u7d14CASE\u5f0f\u3068\u691c\u7d22CASE\u5f0f<\/h3>\n\n\n\n
CASE\u5f0f\u306b\u306f\u5358\u7d14CASE\u5f0f\u3068\u691c\u7d22CASE\u5f0f\u306e2\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
\u5358\u7d14CASE\u5f0f\u3068\u306f<\/h4>\n\n\n
\u5358\u7d14CASE\u5f0f\u306f\u7279\u5b9a\u306e\u5024\u3092\u6761\u4ef6\u3068\u3057\u3066\u3001\u305d\u306e\u5024\u306b\u4e00\u81f4\u3059\u308b\u304b\u5426\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u4e00\u81f4\u3059\u308b\u5024\u304c\u3042\u308b\u5834\u5408\u306f\u305d\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u7d50\u679c\u3092\u8fd4\u3057\u3001\u306a\u3044\u5834\u5408\u306f\u3001ELSE\u3067\u6307\u5b9a\u3055\u308c\u305f\u30c7\u30d5\u30a9\u30eb\u30c8\u7d50\u679c\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5024\u306b\u3088\u3063\u3066\u7d50\u679c\u3092\u5206\u5c90\u3055\u305b\u308b\u5834\u5408\u306b\u3053\u306e\u5358\u7d14CASE\u5f0f\u304c\u7528\u3044\u3089\u308c\u307e\u3059\u3002<\/span><\/span><\/p>\n
\u25c6\u5358\u7d14CASE\u5f0f\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/strong><\/p>\n\n\n
SELECT 1                                                  \/\/\u3059\u3079\u3066\u306e\u30ab\u30e9\u30e0\u3092\u53d6\u5f97\n  CASE [\u30ab\u30e9\u30e0\u540d]                                  \/\/[\u30ab\u30e9\u30e0\u540d]\u3092\u5bfe\u8c61\u3068\u3057\u3066\u6761\u4ef6\u5206\u5c90\n      WHEN [\u5024A] THEN [\u51e6\u7406A]               \/\/\u5024A\u306e\u5834\u5408\u306b\u51e6\u7406A\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n      WHEN [\u5024B] THEN [\u51e6\u7406B]          \/\/\u5024B\u3092\u6e80\u305f\u3059\u5834\u5408\u306b\u51e6\u7406B\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n      ELSE [\u51e6\u7406C]                    \/\/\u4e0a\u8a18\u5024\u3067\u306a\u3044\u5834\u5408\u306b\u51e6\u7406C\uff08\u8868\u793a\u3059\u308b\u5185\u5bb9\uff09\u3092\u884c\u3046\n  END AS [\uff5e]                            \/\/CASE\u5f0f\u306e\u30ab\u30e9\u30e0\u3092\"\uff5e\"\u3068\u3044\u3046\u30ab\u30e9\u30e0\u540d\u306b\u3059\u308b\nFROM [\u30c6\u30fc\u30d6\u30eb\u540d];                                         \/\/[\u30c6\u30fc\u30d6\u30eb\u540d]\u304b\u3089\u53d6\u5f97<\/pre><\/div>\n\n\n\n
\n\"\u5358\u7d14case\u5f0f\"\n\n\n
\u25c6\u5177\u4f53\u4f8b<\/strong><\/p>\n\n\n
CASE \u6027\u5225\n    WHEN '\u7537' THEN 1\n    WHEN '\u5973' THEN 2\n    ELSE 0\nEND<\/pre><\/div>\n\n\n
\u4e0a\u8a18\u306e\u4f8b\u3067\u306fgender\u5217\u306e\u5024\u306b\u5fdc\u3058\u3066\u7570\u306a\u308b\u7d50\u679c\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002’\u7537’\u306e\u5834\u5408\u306f\u300c1\u300d\u3001’\u5973’\u306e\u5834\u5408\u306f\u300c2\u300d\u3001\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u300c0\u300d\u3068\u3044\u3046\u8868\u793a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u5358\u7d14CASE\u5f0f\u306e\u7279\u5fb4<\/strong><\/span><\/p>\n