{"id":4761,"date":"2018-06-21T11:52:47","date_gmt":"2018-06-21T02:52:47","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=4761"},"modified":"2023-05-27T23:18:31","modified_gmt":"2023-05-27T14:18:31","slug":"%e3%80%90sql%e3%80%91case%e5%bc%8f%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=4761","title":{"rendered":"\u3010SQL\u3011CASE\u5f0f\u306b\u3064\u3044\u3066"},"content":{"rendered":"<h2>CASE\u5f0f\u306e\u7a2e\u985e<\/h2>\n<p>\u4ee5\u4e0b\u30012\u3064\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5358\u7d14CASE\u5f0f<\/li>\n<li>\u691c\u7d22CASE\u5f0f<\/li>\n<\/ul>\n<h3>\u691c\u7d22CASE\u5f0f<\/h3>\n<p>\u5358\u7d14CASE\u5f0f\u306e\u4e0a\u4f4d\u4e92\u63db\u3067\u3059\u3002\u5358\u7d14CASE\u5f0f\u306e\u6a5f\u80fd\u3092\u5168\u3066\u542b\u3093\u3067\u3044\u307e\u3059\u3002\u691c\u7d22CASE\u5f0f\u3060\u3051\u899a\u3048\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>\u691c\u7d22CASE\u5f0f\u306e\u69cb\u6587<\/h2>\n<pre class=\"lang:default decode:true\">CASE WHEN \u6761\u4ef61 THEN \u7d50\u679c1\r\n     WHEN \u6761\u4ef62 THEN \u7d50\u679c2\r\n     ELSE \u305d\u306e\u4ed6\u306e\u7d50\u679c\r\nEND<\/pre>\n<p>WHEN\u53e5\u3067\u6307\u5b9a\u3059\u308b\u6761\u4ef6\u3068\u306f\u3001<span style=\"color: #ff0000;\"><strong>\u623b\u308a\u5024\u304c\u771f\u7406\u5024\uff08TRUE\/FALSE\/UNKNOWN\uff09\u304c\u5909\u3048\u308b\u3088\u3046\u306a\u5f0f<\/strong><\/span>\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u623b\u308a\u5024\u304c\u300cTRUE\u300d\u3067\u3042\u308c\u3070\u3001THEN\u53e5\u306e\u7d50\u679c\u304c\u8fd4\u308a\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057\u3001\u4f55\u3082\u6761\u4ef6\u306b\u8a72\u5f53\u3059\u308b\u3082\u306e\u304c\u306a\u304b\u3063\u305f\u5834\u5408\u306f\u3001ELSE\u3067\u6307\u5b9a\u3055\u308c\u305f\u5024\u304c\u7d50\u679c\u3068\u3057\u3066\u8fd4\u308a\u307e\u3059\u3002<\/p>\n<h3>ELSE\u53e5\u306b\u3064\u3044\u3066<\/h3>\n<p>ELSE\u53e5\uff08\u4f55\u3082\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u51e6\u7406\u3055\u308c\u308b\u7d50\u679c\uff09\u306f\u3001<span style=\"color: #ff0000;\"><strong>\u7701\u7565\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u305d\u306e\u5834\u5408\u306f<span style=\"color: #ff0000;\"><strong>\u300cELSE NULL\u300d<\/strong><\/span>\u3068\u3044\u3046\u51e6\u7406\u306b\u81ea\u52d5\u3067\u5909\u63db\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u5fc5\u305a\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>CASE\u5f0f\u306e\u30e1\u30ea\u30c3\u30c8<\/h2>\n<ul>\n<li>CASE\u5f0f\u306f\u3001\u3069\u306eRDBMS\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u3066\u975e\u5e38\u306b\u6c4e\u7528\u6027\u304c\u9ad8\u3044\u8a18\u8ff0\u65b9\u6cd5<\/li>\n<li>CASE\u5f0f\u306f\u3001\u3042\u304f\u307e\u3067\u300c\u5f0f\u300d\u3068\u3044\u3046\u6271\u3044\u306a\u306e\u3067\u3001\u5f0f\u3092\u4f7f\u3048\u308b\u53e5\u3067\u3042\u308c\u3070\u3069\u3053\u306b\u3067\u3082\u8a18\u8ff0\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<h3>CASE\u5f0f\u306f\u3001\u3069\u306eRDBMS\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u3066\u975e\u5e38\u306b\u6c4e\u7528\u6027\u304c\u9ad8\u3044\u8a18\u8ff0\u65b9\u6cd5<\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u5024\u306b\u3088\u3063\u3066\u3001\u7d50\u679c\u3092\u5206\u5c90\u3055\u305b\u308b\u95a2\u6570\u3068\u3057\u3066\u306f\u3001Oracle\u3067\u3042\u308c\u3070\u300cDECODE\u95a2\u6570\u300d\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u308c\u306fOracle\u3067\u3057\u304b\u4f7f\u3048\u305a\u6c4e\u7528\u6027\u304c\u4f4e\u3044\u3067\u3059\u3002<\/p>\n<p>CASE\u5f0f\u3067\u3042\u308c\u3070\u3001<span style=\"color: #ff0000;\"><strong>\u6a19\u6e96SQL\u306e\u305f\u3081\u6c4e\u7528\u6027\u306f\u9ad8\u3044<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<h4>\u4ed6\u306eDBMS\u306e\u65b9\u8a00\u306f\u4f7f\u3063\u305f\u65b9\u304c\u3044\u3044\u306e\uff1f<\/h4>\n<p>\u4f8b\u3048\u3070\u3001Oracle\u3067\u3042\u308c\u3070\u3001DECODE\u95a2\u6570\u3001MySQL\u3067\u3042\u308c\u3070\u3001IF\u95a2\u6570\u304cCASE\u5f0f\u3068\u540c\u3058\u6a5f\u80fd\u3092\u6301\u3064\u95a2\u6570\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306f<span style=\"color: #ff0000;\"><strong>\u7279\u5b9a\u306eDBMS\u3067\u3057\u304b\u52d5\u304b\u306a\u3044\u3067\u3059\u3057\u3001CASE\u5f0f\u306b\u6bd4\u3079\u308b\u3068\u67d4\u8edf\u6027\u304c\u5c11\u3057\u306a\u3044\u306e\u3067\u3001\u3042\u307e\u308a\u4f7f\u308f\u306a\u3044\u65b9\u304c\u3088\u3044<\/strong><\/span>\u3067\u3057\u3087\u3046\u3002<\/p>\n<h3>CASE\u5f0f\u306f\u3001\u3042\u304f\u307e\u3067\u300c\u5f0f\u300d\u3068\u3044\u3046\u6271\u3044\u306a\u306e\u3067\u3001\u300c\u5f0f\u300d\u3092\u4f7f\u3048\u308b\u53e5\u3067\u3042\u308c\u3070\u3069\u3053\u306b\u3067\u3082\u66f8\u3051\u308b\u3002<\/h3>\n<p>\u4f8b\u3048\u3070\u3001<span style=\"color: #ff0000;\"><strong>\u96c6\u7d04\u95a2\u6570(SUM\u3001MAX\u7b49)\u306e\u4e2d<\/strong><\/span>\u306b\u3082\u8a18\u8ff0\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>CASE\u5f0f\u306f\u3001<span style=\"color: #ff0000;\"><strong>\u5b9f\u884c\u6642\u306b\u8a55\u4fa1\u3055\u308c\u3066\u4e00\u3064\u306e\u5024\u306b\u5b9a\u307e\u308a\u307e\u3059\u3002<\/strong><\/span><\/p>\n<p>GROUP BY\u53e5\u3068\u4f75\u7528\u3059\u308c\u3070\u3001HAVING\u53e5\u3092\u4f7f\u308f\u306a\u304f\u3066\u3082SQL\u3092\u66f8\u3051\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ed6\u306b\u306f\u3001\u4f8b\u3048\u3070\u4e0b\u8a18\u306e\u3088\u3046\u306b\u3001<span style=\"color: #ff0000;\"><strong>\u5217\u540d\u3084\u3001\u5b9a\u6570\u3092\u66f8\u3051\u308b\u5834\u6240<\/strong><\/span>\u306b\u306f\u3069\u3053\u306b\u3067\u3082\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>SELECT\u53e5<\/li>\n<li>WHERE\u53e5<\/li>\n<li>ORDER\u00a0 BY\u53e5<\/li>\n<\/ul>\n<p>\u975e\u5e38\u306b\u81ea\u7531\u5ea6\u304c\u9ad8\u304f\u4fbf\u5229\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"CASE\u5f0f\u306e\u7a2e\u985e \u4ee5\u4e0b\u30012\u3064\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002 \u5358\u7d14CASE\u5f0f \u691c\u7d22CASE\u5f0f \u691c\u7d22CASE\u5f0f \u5358\u7d14CASE\u5f0f\u306e\u4e0a\u4f4d\u4e92\u63db\u3067\u3059\u3002\u5358\u7d14CASE\u5f0f\u306e\u6a5f\u80fd\u3092\u5168\u3066\u542b\u3093\u3067\u3044\u307e\u3059\u3002\u691c\u7d22CASE\u5f0f\u3060\u3051\u899a\u3048\u308c\u3070\u826f\u3044\u3067\u3057\u3087\u3046\u3002 \u691c\u7d22CASE [&hellip;]","protected":false},"author":1,"featured_media":4823,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[24],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/4761"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4761"}],"version-history":[{"count":15,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/4761\/revisions"}],"predecessor-version":[{"id":20590,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/4761\/revisions\/20590"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/media\/4823"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4761"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}