{"id":204,"date":"2014-06-25T19:15:12","date_gmt":"2014-06-25T10:15:12","guid":{"rendered":"http:\/\/kei0310.info\/?p=204"},"modified":"2014-06-25T19:31:15","modified_gmt":"2014-06-25T10:31:15","slug":"postgresqlsql-case-when%e6%96%87","status":"publish","type":"post","link":"http:\/\/kei0310.info\/?p=204","title":{"rendered":"[SQL] case when\u6587"},"content":{"rendered":"<p>select\u7d50\u679c\u3092\u6761\u4ef6\u3067\u632f\u308a\u5206\u3051\u308bSQL<\/p>\n<p>\u901a\u5e38\u306fjoin\u3068\u304bwhere\u53e5\u3067\u632f\u308a\u5206\u3051\u305f\u308a\u3057\u307e\u3059\u304c\u3001<br \/>\nselect\u7d50\u679c\u306b\u5bfe\u3057\u3066\u632f\u308a\u5206\u3051\u308b\u3068\u51e6\u7406\u304c\u9ad8\u901f\u306b\u306a\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\uff09\u4ee5\u4e0b\u306e\u5c65\u6b74\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3066\u3001\u6708\u6bce\u306b500\u5186\u4ee5\u4e0a\u306e\u660e\u7d30\u3092\u30ab\u30a6\u30f3\u30c8\u3059\u308b\u3002<\/p>\n<pre>\r\n<tt>\r\n      date_time      | id | val\r\n---------------------+----+------\r\n 2014-05-05 00:00:00 |  1 |  500\r\n 2014-05-13 00:00:00 |  2 | 1500\r\n 2014-05-14 00:00:00 |  2 |  200\r\n 2014-05-20 00:00:00 |  1 |  800\r\n 2014-05-23 00:00:00 |  1 |  100\r\n 2014-05-30 00:00:00 |  4 |  600\r\n 2014-06-01 00:00:00 |  1 |  600\r\n 2014-06-05 00:00:00 |  5 |   50\r\n<\/tt>\r\n<\/pre>\n<p>\u307e\u305a\u306f\u666e\u901a\u306b\u3084\u3063\u3066\u307f\u307e\u3059\u3002<br \/>\n500\u5186\u4ee5\u4e0a\u306e\u660e\u7d30\u306bwhere\u53e5\u3067\u7d5e\u3063\u3066\u304b\u3089\u3001group by\u3067\u30b5\u30de\u30ea\u3057\u3066count\u3092\u3068\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"brush: sql; title: ; notranslate\" title=\"\">\r\nselect\r\n  date_trunc('month', V1.date_time ) as month\r\n  , count(*) as cnt\r\nfrom\r\n(\r\nselect\r\n  *\r\nfrom\r\n  public.\u5c65\u6b74\u30c6\u30fc\u30d6\u30eb T1\r\nwhere\r\n  T1.val &gt;= 500\r\n) V1\r\ngroup by\r\n  month\r\n<\/pre>\n<p>\u3053\u308c\u3092case when\u6587\u3067\u3084\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\ncase when\u3067\u300c500\u5186\u4ee5\u4e0a\u3067\u3042\u308c\u30701\u300d\u3068\u3044\u3046\u6761\u4ef6\u306b\u3057\u3066sum\u95a2\u6570\u3067\u5408\u8a08\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\nSQL\u306e\u30cd\u30b9\u30c8\u304c\uff11\u3064\u5c11\u306a\u304f\u306a\u3063\u3066\u30b7\u30f3\u30d7\u30eb\u306a\u69cb\u6210\u3092\u5b9f\u73fe\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"brush: sql; title: ; notranslate\" title=\"\">\r\nselect\r\n  date_trunc('month', T1.date_time ) as month\r\n  , sum(\r\n     case when T1.val &gt;= 500\r\n       then 1\r\n       else 0\r\n     end\r\n    ) as cnt\r\nfrom\r\n  public.\u5c65\u6b74\u30c6\u30fc\u30d6\u30eb T1\r\ngroup by\r\n  month\r\n<\/pre>\n<p>SQL\u5b9f\u884c\u7d50\u679c\u306f\u4e21\u65b9\u3068\u3082\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre>\r\n<tt>\r\n        month        | cnt\r\n---------------------+-----\r\n 2014-05-01 00:00:00 |   4\r\n 2014-06-01 00:00:00 |   1\r\n<\/tt>\r\n<\/pre>\n<p>\u3061\u306a\u307f\u306b\u3001date_trunc\u306fPostgreSQL\u72ec\u81ea\u3067\u3059\u306e\u3067\u3001MySQL\u3068Oracle\u3067\u3084\u308b\u5834\u5408\u306b\u306f\u4ee5\u4e0b\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n\u25cfMySQL<br \/>\n\u3000DATE_FORMAT(T1.date_time, '%Y-%m-01')<br \/>\n\u25cfOracle<br \/>\n\u3000trunc(T1.date_time, 'mm')<\/p>\n","protected":false},"excerpt":{"rendered":"<p>select\u7d50\u679c\u3092\u6761\u4ef6\u3067\u632f\u308a\u5206\u3051\u308bSQL \u901a\u5e38\u306fjoin\u3068\u304bwhere\u53e5\u3067\u632f\u308a\u5206\u3051\u305f\u308a\u3057\u307e\u3059\u304c\u3001 select\u7d50\u679c\u306b\u5bfe\u3057\u3066\u632f\u308a\u5206\u3051\u308b\u3068\u51e6\u7406\u304c\u9ad8\u901f\u306b\u306a\u3063\u305f\u308a\u3057\u307e\u3059\u3002 \u4f8b\uff09\u4ee5\u4e0b\u306e\u5c65\u6b74\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3066\u3001\u6708\u6bce\u306b500\u5186\u4ee5\u4e0a\u306e\u660e\u7d30 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[37,10],"tags":[47,50,51,184,49,48],"_links":{"self":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/204"}],"collection":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=204"}],"version-history":[{"count":3,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/204\/revisions"}],"predecessor-version":[{"id":209,"href":"http:\/\/kei0310.info\/index.php?rest_route=\/wp\/v2\/posts\/204\/revisions\/209"}],"wp:attachment":[{"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=204"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/kei0310.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}