{"id":14748,"date":"2021-10-24T17:09:04","date_gmt":"2021-10-24T08:09:04","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=14748"},"modified":"2023-05-27T23:15:17","modified_gmt":"2023-05-27T14:15:17","slug":"%e3%80%90sql%e3%80%91%e3%80%8con%e5%8f%a5%e3%80%8d%e3%81%ae%e6%9c%ac%e5%bd%93%e3%81%ae%e6%84%8f%e5%91%b3","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=14748","title":{"rendered":"\u3010SQL\u3011\u300cON\u53e5\u300d\u306e\u610f\u5916\u3068\u77e5\u3089\u306a\u3044\u6d3b\u7528\u6cd5"},"content":{"rendered":"<p>\u624b\u8efd\u306b\u4f7f\u3048\u308b\u306e\u3067\u3059\u304c\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9593\u3067\u3082\u610f\u5916\u3068\u77e5\u3089\u308c\u3066\u3044\u306a\u3044SQL\u306e\u6d3b\u7528\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2>\u901a\u5e38\u306eJOIN\u306eON\u53e5\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>JOIN\u306eON\u53e5\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7d50\u5408\u6761\u4ef6\u306e\u305f\u3081\u306b\u666e\u901a\u306f\u4f7f\u3046\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">select * \r\n  from A \r\n  LEFT JOIN B\r\n  ON A.\u30ab\u30e9\u30e01 = B.\u30ab\u30e9\u30e01<\/pre>\n<p>\u305d\u308c\u3067\u7d50\u5408\u5f8c\u306b\u6761\u4ef6\u3092\u7d5e\u308a\u305f\u3044\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:default decode:true\">select * \r\n  from A \r\n  LEFT JOIN B\r\n  ON A.\u30ab\u30e9\u30e01 = B.\u30ab\u30e9\u30e01\r\nWHERE B.\u30ab\u30e9\u30e02 = \"XXX\"<\/pre>\n<h2>\u300c\u7d50\u5408\u6761\u4ef6\u300d\u3068\u300c\u62bd\u51fa\u6761\u4ef6\u300d\u3092\u533a\u5225\u3059\u308b\u3053\u3068<\/h2>\n<p>\u305f\u3060\u3001\u3053\u308c\u306fON\u53e5\u3067\u540c\u3058\u3053\u3068\u3092\u66f8\u3051\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">select * \r\n  from A \r\n  LEFT JOIN B\r\n  ON A.\u30ab\u30e9\u30e01 = B.\u30ab\u30e9\u30e01\r\n  AND B.\u30ab\u30e9\u30e02 = \"XXX\"<\/pre>\n<p>ON\u53e5\u306e\u4ed5\u69d8\u3068\u3057\u3066<span style=\"color: #ff0000;\"><strong>\u7247\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u3057\u304b\u95a2\u4fc2\u306a\u3044\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u7247\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u62bd\u51fa\u6761\u4ef6<\/strong><\/span>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u8ff0\u3060\u3068A\u30c6\u30fc\u30d6\u30eb\u3092\u5fc5\u8981\u3068\u3057\u306a\u3044\u306e\u3067\u5148\u306bB\u30c6\u30fc\u30d6\u30eb\u306e\u4ef6\u6570\u3092\u6e1b\u3089\u3059\u6319\u52d5\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u300cON A.\u30ab\u30e9\u30e01 = B.\u30ab\u30e9\u30e01\u300d\u3068\u3044\u3046\u30c6\u30fc\u30d6\u30ebA\u3068\u30c6\u30fc\u30d6\u30ebB\u3069\u3061\u3089\u306b\u3082\u95a2\u4fc2\u3059\u308b\u7d50\u5408\u6761\u4ef6\u304c\u52d5\u4f5c\u3059\u308b\u305f\u3081\u51e6\u7406\u304c\u30c6\u30fc\u30d6\u30ebB\u306e\u5bfe\u8c61\u4ef6\u6570\u304c\u6e1b\u308b\u305f\u3081\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002(SQL\u306e\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306e\u4ed5\u69d8\u3068\u3057\u3066\u306f\u3001ON\u53e5\u306e\u5f8c\u306bwhere\u53e5\u304c\u52d5\u304f\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3002\uff09<\/p>\n<p>on\u53e5\u3067\u306f\u306a\u304fwhere\u53e5\u306b\u62bd\u51fa\u6761\u4ef6\u3092\u66f8\u3044\u3066\u3057\u307e\u3046\u66f8\u304d\u65b9\u3060\u3068\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u7d50\u5408\u3057\u305f\u5f8c\u306b\u3001where\u53e5\u3067\u7d5e\u308b\u52d5\u4f5c\u306b\u306a\u308b\u306e\u3067<span style=\"color: #ff0000;\"><strong>\u4eee\u306b\u30c6\u30fc\u30d6\u30ebB\u304c\u5927\u304d\u3044\u30c6\u30fc\u30d6\u30eb\u3060\u3063\u305f\u5834\u5408\u306f\u304b\u306a\u308a\u7d50\u5408\u51e6\u7406\u304c\u91cd\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/strong><\/span><\/p>\n<p>\u62bd\u51fa\u6761\u4ef6\u306b\u4f7f\u3046\u306e\u3067\u3042\u308c\u3070\u3001\u3067\u304d\u308b\u3060\u3051WHERE\u53e5\u3067\u306f\u306a\u304fON\u53e5\u3092\u6d3b\u7528\u3059\u308b\u306e\u304c\u826f\u3044SQL\u8a2d\u8a08\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u300cON\u53e5\u306b\u306f\u7d50\u5408\u6761\u4ef6\u3092\u66f8\u3044\u3066\u3001where\u53e5\u3067\u7d50\u5408\u7d50\u679c\u3092\u62bd\u51fa\u3059\u308b\u3002\u300d\u307f\u305f\u3044\u306a\u6587\u6cd5\u306e\u610f\u5473\u3060\u3051\u8003\u3048\u3066\u3044\u308b\u3068\u306a\u304b\u306a\u304b\u3053\u306e\u4e8b\u5b9f\u306b\u306f\u8fbf\u308a\u7740\u304b\u306a\u3044\u306e\u3067\u73fe\u5834\u306e\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u4eba\u3067\u3082\u610f\u5916\u3068\u77e5\u3089\u306a\u3044\u4eba\u304c\u591a\u3044\u3042\u308b\u7a2e\u88cf\u6280\u3068\u8a00\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3000\u7b11<\/p>\n<p>\u307e\u305f\u3001\u8fd1\u5e74\u306fRails\u306a\u3069\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306a\u3069\u3092OR\u30de\u30c3\u30d1\u30fc\u3092\u4f7f\u3063\u305f\u958b\u767a\u304c\u4e00\u822c\u7684\u306b\u306a\u3063\u3066\u304d\u3066\u304a\u308a\u3082\u3057\u304b\u3057\u305f\u3089\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u3088\u3063\u3066\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u4f7f\u3048\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u3082\u3057\u5287\u7684\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u6539\u5584\u3055\u308c\u308b\u3088\u3046\u3067\u3042\u308c\u3070\u305d\u306e\u90e8\u5206\u3060\u3051\u90e8\u5206\u7684\u306bwhere\u6761\u4ef6\u3092ON\u53e5\u306b\u79fb\u52d5\u3055\u305b\u308b\u3088\u3046\u306b\u3057\u3066\u3082\u826f\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u624b\u8efd\u306b\u4f7f\u3048\u308b\u306e\u3067\u3059\u304c\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9593\u3067\u3082\u610f\u5916\u3068\u77e5\u3089\u308c\u3066\u3044\u306a\u3044SQL\u306e\u6d3b\u7528\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002 \u901a\u5e38\u306eJOIN\u306eON\u53e5\u306e\u4f7f\u3044\u65b9 JOIN\u306eON\u53e5\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u7d50\u5408\u6761\u4ef6\u306e\u305f\u3081\u306b\u666e\u901a\u306f\u4f7f\u3046\u3068\u601d\u3044\u307e\u3059\u3002 select * from  [&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\/14748"}],"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=14748"}],"version-history":[{"count":8,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14748\/revisions"}],"predecessor-version":[{"id":20584,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14748\/revisions\/20584"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14748"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}