{"id":14863,"date":"2021-11-07T19:08:52","date_gmt":"2021-11-07T10:08:52","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=14863"},"modified":"2023-05-27T23:13:57","modified_gmt":"2023-05-27T14:13:57","slug":"%e3%80%90sql%e3%80%91%e7%af%84%e5%9b%b2%e3%82%92%e9%9b%86%e8%a8%88%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=14863","title":{"rendered":"\u3010SQL\u3011GROUP BY\u3067\u7bc4\u56f2\u3092\u96c6\u8a08\u3059\u308b\u65b9\u6cd5(\u30d1\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ab\u30c3\u30c8\u3001\u90e8\u5206\u96c6\u7d04)"},"content":{"rendered":"<h2>\u7bc4\u56f2\u3092\u96c6\u8a08\u3059\u308b<\/h2>\n<p>SELECT\u53e5\u306eCASE\u5f0f\u3067\u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u3066\u3044\u305f\u3060\u304d\u3001\u305d\u308c\u3092GROUP BY\u3067\u6307\u5b9a\u3059\u308c\u3070\u7bc4\u56f2\u3067\u306e\u96c6\u8a08\u3092\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3092<span style=\"color: #ff0000;\"><strong>\u300c\u30d1\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ab\u30c3\u30c8\u300d<\/strong><\/span>\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n<h2>\u66f8\u304d\u65b9<\/h2>\n<p>\u305f\u3060\u3001\u3053\u306e\u66f8\u304d\u65b9\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u306e\u3067\u3059\u304c\u3001<span style=\"color: #ff0000;\"><strong>\u6a19\u6e96\u9055\u53cd<\/strong><\/span>\u306b\u306f\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">select CASE WHEN age &lt; 20 THEN '\u5b50\u4f9b'\r\n            WHEN age BETWEEN 20 AND 69 THEN '\u6210\u4eba'\r\n            WHEN age &gt;= 70 THEN '\u8001\u4eba'\r\n       ELSE NULL END AS \u5e74\u4ee3,count(*) as \u4eba\u6570\r\nfrom Persons\r\nGROUP BY \u5e74\u4ee3<\/pre>\n<p>\u306a\u304a\u3001\u4ee5\u4e0b\u306e\u5185\u5bb9\u3068\u7b49\u4fa1\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u66f8\u304d\u65b9\u304c<span style=\"color: #ff0000;\"><strong>SQL\u6a19\u6e96<\/strong><\/span>\u3067\u306e\u66f8\u304d\u65b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true \">select CASE WHEN age &lt; 20 THEN '\u5b50\u4f9b'\r\n            WHEN age BETWEEN 20 AND 69 THEN '\u6210\u4eba'\r\n            WHEN age &gt;= 70 THEN '\u8001\u4eba'\r\n       ELSE NULL END AS \u5e74\u4ee3,count(*) as \u4eba\u6570\r\nfrom Persons\r\nGROUP BY CASE WHEN age &lt; 20 THEN '\u5b50\u4f9b'\r\n            WHEN age BETWEEN 20 AND 69 THEN '\u6210\u4eba'\r\n            WHEN age &gt;= 70 THEN '\u8001\u4eba'\r\n       ELSE NULL END;<\/pre>\n<p>GROUP BY\u53e5\u306b\u306f\u5217\u540d\u3060\u3051\u3092\u6307\u5b9a\u3059\u308b\u3082\u306e\u3068\u8a8d\u8b58\u3057\u3066\u3044\u308b\u4eba\u304c\u591a\u3044\u306e\u3067\u3059\u304c\u3001CASE\u5f0f\u3092\u5229\u7528\u3057\u305f\u7bc4\u56f2\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u7bc4\u56f2\u3067\u306e\u96c6\u8a08\u304c\u53ef\u80fd\u306b\u306a\u308b\u30c6\u30af\u30cb\u30c3\u30af\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30d1\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ab\u30c3\u30c8\u306f\u5b9f\u884c\u8a08\u753b\u306b\u306f\u5f71\u97ff\u3059\u308b\uff1f<\/h2>\n<p>GROUP BY\u3067CASE\u5f0f\u3092\u4f7f\u3063\u3066\u3082\u666e\u901a\u306bGROUP BY\u3092\u4f7f\u3046\u5834\u5408\u306e\u5b9f\u884c\u8a08\u753b\u306b\u306a\u308a\u7279\u306b\u5f71\u97ff\u306f\u3057\u306a\u3044\u3067\u3059\u3002\u3082\u3061\u308d\u3093\u3001\u82e5\u5e72CASE\u5f0f\u306e\u6f14\u7b97\u306f\u767a\u751f\u3059\u308b\u306e\u3067\u901a\u5e38\u306eGROUP BY\u306b\u6bd4\u3079\u305f\u3089CPU\u6f14\u7b97\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u306f\u767a\u751f\u3059\u308b\u306e\u3067\u3059\u304c\u3001\u5b9f\u884c\u8a08\u753b\u306e\u30a2\u30af\u30bb\u30b9\u30d1\u30b9\u306b\u306f\u5168\u304f\u5f71\u97ff\u306f\u306a\u3044\u306e\u3067\u30d1\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ab\u30c3\u30c8\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u306f\u307b\u3068\u3093\u3069\u5f71\u97ff\u306f\u306a\u3044\u3068\u898b\u3066\u826f\u3044\u3067\u3059\u3002<\/p>\n<h2>PARTITION BY\u53e5\u3068\u6bd4\u3079\u305f\u3089\u3069\u3046\u304b<\/h2>\n<p>\u30a6\u30a4\u30f3\u30c9\u30a6\u95a2\u6570\u306bPARTITION BY\u3068\u3044\u3046\u6a5f\u80fd\u304c\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u6a5f\u80fd\u7684\u306b\u306f\u9055\u3044\u306f\u306a\u3044\u3067\u3059\u3002\u305f\u3060\u3001\u96c6\u7d04\u306f\u3057\u306a\u3044\u306e\u3067\u305d\u306e\u307e\u307e\u306e\u7d50\u679c\u304c\u51fa\u3066\u304d\u305f\u308a\u3057\u307e\u3059\u3057\u3001\u305d\u3082\u305d\u3082RDBMS\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u3088\u3063\u3066\u306f\u30a6\u30a4\u30f3\u30c9\u30a6\u95a2\u6570\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u306e\u3067\u6ce8\u610f\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u7bc4\u56f2\u3092\u96c6\u8a08\u3059\u308b SELECT\u53e5\u306eCASE\u5f0f\u3067\u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u3066\u3044\u305f\u3060\u304d\u3001\u305d\u308c\u3092GROUP BY\u3067\u6307\u5b9a\u3059\u308c\u3070\u7bc4\u56f2\u3067\u306e\u96c6\u8a08\u3092\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3092\u300c\u30d1\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u30ab\u30c3\u30c8\u300d\u3068\u547c\u3073\u307e\u3059\u3002 \u66f8\u304d\u65b9 \u305f\u3060\u3001\u3053\u306e\u66f8\u304d\u65b9\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u306e\u3067 [&hellip;]","protected":false},"author":1,"featured_media":0,"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\/14863"}],"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=14863"}],"version-history":[{"count":9,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14863\/revisions"}],"predecessor-version":[{"id":20579,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14863\/revisions\/20579"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14863"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}