{"id":14768,"date":"2021-10-30T12:11:57","date_gmt":"2021-10-30T03:11:57","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=14768"},"modified":"2023-05-27T23:14:55","modified_gmt":"2023-05-27T14:14:55","slug":"%e3%80%90sql%e3%80%91in%e3%81%a8exists%e3%81%ae%e9%81%95%e3%81%84","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=14768","title":{"rendered":"\u3010SQL\u3011IN\u3068EXISTS\u3001JOIN\u306e\u9055\u3044"},"content":{"rendered":"<p>\u3088\u304f\u3001EXISTS\u306e\u65b9\u304c\u901f\u3044\u306e\u3067EXISTS\u3092\u4f7f\u3046\u3079\u304d\u3068\u8a00\u308f\u308c\u3066\u3044\u305f\u308a\u3057\u307e\u3059\u304c\u3001\u305d\u308c\u306f\u9593\u9055\u3044\u3067\u3059\u3002\u7528\u9014\u306b\u5408\u308f\u305b\u3066\u4f7f\u3063\u3066\u3044\u304f\u306e\u304c\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u3044\u308d\u3044\u308d\u8abf\u67fb\u3057\u3066\u307f\u305f\u7d50\u679c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f7f\u3044\u5206\u3051\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:default decode:true \">\u5225\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u51fa\u529b\u5bfe\u8c61\u306b\u3057\u305f\u3044\u5834\u5408\uff1aJOIN\u3092\u4f7f\u3046\u3002\r\n\u5225\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u62bd\u51fa\u6761\u4ef6\u306b\u4f7f\u7528\u3057\u3001\u4e3b\u30c6\u30fc\u30d6\u30eb\u306e\u9078\u629e\u6027\u304c\u9ad8\u3044\u5834\u5408\uff1aEXISTS\u3092\u4f7f\u3046\u3002\r\n\u5225\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u62bd\u51fa\u6761\u4ef6\u306b\u4f7f\u7528\u3057\u3001\u5f93\u30c6\u30fc\u30d6\u30eb\u306e\u9078\u629e\u6027\u304c\u9ad8\u3044\u5834\u5408\uff1aIN\u3092\u4f7f\u3046\u3002<\/pre>\n<h3>MySQL\u306e\u5834\u5408\u306f\u7279\u6b8a<\/h3>\n<p>\u306a\u304a\u3001Web\u696d\u754c\u306e\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u308f\u308c\u308bMySQL\u3067\u306f\u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u304b\u306a\u308a\u9045\u304f\u306a\u308b\u306e\u3067\u3001EXISTS\u3092\u4f7f\u3046\u306e\u3067\u3042\u308c\u3070JOIN\u3092\u4f7f\u3063\u305f\u65b9\u304c\u826f\u3044\u30b1\u30fc\u30b9\u304c\u591a\u3044\u3088\u3046\u3067\u3059\u3002\uff08IN\u3092\u4f7f\u3063\u305f\u30b5\u30d6\u30af\u30a8\u30ea\u3082\u5185\u90e8\u7684\u306bEXISTS\u306b\u66f8\u304d\u5909\u308f\u308b\u3088\u3046\u306a\u306e\u3067\u3001INNER JOIN\u306e\u65b9\u304c\u65e9\u3044\u306e\u3067\u3057\u3087\u3046\u3002\uff09\u305f\u3060\u3001JOIN + DISTINCT\u3067\u91cd\u8907\u6392\u9664\u51e6\u7406\u306b\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308b\u3088\u3046\u306aSQL\u3067\u3042\u308c\u3070\u3001EXISTS\u306e\u65b9\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u512a\u308c\u308b\u5834\u9762\u304c\u767a\u751f\u3059\u308b\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u306d\u3002\u306a\u306e\u3067\u3001<span style=\"color: #ff0000;\"><strong>MySQL\u306e\u5834\u5408\u306fINNER JOIN\u3068EXISTS\u3092\u4f7f\u3044\u5206\u3051\u307e\u3057\u3087\u3046<\/strong><\/span>\u3068\u3044\u3046\u8a71\u306b\u306a\u308b\u306e\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>IN\u3068EXITS\u306e\u30b5\u30f3\u30d7\u30eb<\/h2>\n<p>\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"OdQt0ihQwb\"><p><a href=\"http:\/\/www.code-magagine.com\/?p=4727\">\u3010SQL\u3011\uff12\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u3067\u5024\u304c\u4e00\u81f4\u3059\u308b\u30c7\u30fc\u30bf\u306e\u307f\u62bd\u51fa\u3059\u308b\u3002(IN\u3068EXISTS)<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" src=\"http:\/\/www.code-magagine.com\/?p=4727&#038;embed=true#?secret=OdQt0ihQwb\" data-secret=\"OdQt0ihQwb\" width=\"500\" height=\"282\" title=\"&#8220;\u3010SQL\u3011\uff12\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u9593\u3067\u5024\u304c\u4e00\u81f4\u3059\u308b\u30c7\u30fc\u30bf\u306e\u307f\u62bd\u51fa\u3059\u308b\u3002(IN\u3068EXISTS)&#8221; &#8212; \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30de\u30ac\u30b8\u30f3\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h2>IN\u3068EXITS\u306e\u4ed5\u7d44\u307f\u306e\u9055\u3044<\/h2>\n<p>IN\u306f\u4e3b\u554f\u3044\u5408\u308f\u305b\u306eWHERE\u53e5\u306e\u524d\u3001EXISTS\u306f\u5f8c\u3067\u51e6\u7406\u3055\u308c\u308b\u3002\u57fa\u672c\u601d\u60f3\u3068\u3057\u3066\u306f\u3001<span style=\"color: #ff0000;\"><strong>\u3067\u304d\u308b\u3060\u3051\u65e9\u3044\u6bb5\u968e\u3067\u30c7\u30fc\u30bf\u91cf\u3092\u524a\u304e\u843d\u3068\u305b\u308b\u304b\u3092\u8003\u3048\u308b\u3053\u3068\u304c\u91cd\u8981<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<h2>\u9078\u629e\u6027\u3068\u306f\uff1f<\/h2>\n<p>\u305f\u304f\u3055\u3093\u306e\u9805\u76ee\u306e\u4e2d\u304b\u3089\u7279\u5b9a\u306e\u5024\u3092\u9078\u3076\u5ea6\u5408\u3044\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001<span style=\"color: #ff0000;\"><strong>10\u500b\u306e\u4e2d\u304b\u30891\u3064\u3092\u9078\u3076\u30b1\u30fc\u30b9\u306f\u9078\u629e\u6027\u304c\u9ad8\u3044<\/strong><\/span>\u3068\u8a00\u3048\u307e\u3059\u3057\u3001<span style=\"color: #ff0000;\"><strong>10\u500b\u306e\u4e2d\u304b\u30898\u3064\u3082\u9078\u3079\u3066\u3057\u307e\u3046\u30b1\u30fc\u30b9\u306f\u9078\u629e\u6027\u304c\u4f4e\u3044<\/strong><\/span>\u3068\u8a00\u3048\u307e\u3059\u3002<\/p>\n<h2>IN(\u300cMySQL\u300d\u3060\u3068\u3053\u306e\u8aac\u660e\u306e\u9650\u308a\u3067\u306f\u306a\u3044\u3002\uff09<\/h2>\n<p>\u8a55\u4fa1\u9806\u756a\u304c\u3001\u300c\u526f\u554f\u3044\u5408\u308f\u305b\u2192\u89aa\u554f\u3044\u5408\u308f\u305b\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u300c\u5f93\u8868\u30d5\u30a3\u30eb\u30bf\u306e\u9078\u629e\u6027\u304c\u9ad8\u304f\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u3048\u3066\u30c7\u30fc\u30bf\u3092\u5148\u306b\u524a\u304e\u843d\u3068\u305b\u308b\u5834\u5408\u300d<\/strong><\/span>\u306f\u3053\u3061\u3089\u3092\u4f7f\u3046\u3002<\/p>\n<h3>JOIN\u3068\u306e\u9055\u3044<\/h3>\n<p>\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u4e2d\u306e\u300c\u30c6\u30fc\u30d6\u30eb2.id\u300d\u304c<span style=\"color: #ff0000;\"><strong>\u91cd\u8907\u3057\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u30c6\u30fc\u30d6\u30eb1\u306b\u306f\u4e00\u610f\u306e\u7d50\u679c\u3092\u8fd4\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u306a\u306e\u3067\u3001IN\u306e\u4e2d\u306b\u5927\u91cf\u306b\u91cd\u8907\u30c7\u30fc\u30bf\u304c\u542b\u307e\u308c\u3066\u3057\u307e\u3063\u3066\u3044\u308b\u5834\u5408\u306a\u3069\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3059\u308b\u3068\u8a00\u308f\u308c\u307e\u3059\u3002<\/strong><\/span>\u3044\u308d\u3044\u308d\u8a00\u308f\u308c\u307e\u3059\u304c\u3001IN\u306f\u52b9\u7387\u304c\u60aa\u3044\u3068\u3082\u8a00\u308f\u308c\u307e\u3059\u3002IN\u3092\u4f7f\u3046\u306e\u3067\u3042\u308c\u3070\u3001JOIN\u3092\u4f7f\u3063\u305f\u65b9\u304c\u826f\u3044\u3068\u3044\u3046\u610f\u898b\u3082\u3042\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">select * from \u30c6\u30fc\u30d6\u30eb1 in \u30c6\u30fc\u30d6\u30eb1.id in (select \u30c6\u30fc\u30d6\u30eb2.id from \u30c6\u30fc\u30d6\u30eb2)<\/pre>\n<p>IN\u306e\u4e2d\u3067DISTINCT\u3092\u4f7f\u3046\u5f62\u304c\u826f\u3044\u306e\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2>EXISTS<\/h2>\n<p>\u8a55\u4fa1\u9806\u756a\u304c\u3001\u300c\u89aa\u554f\u3044\u5408\u308f\u305b\u2192\u526f\u554f\u3044\u5408\u308f\u305b\u300d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u300c\u4e3b\u8868\u30d5\u30a3\u30eb\u30bf\u306e\u9078\u629e\u6027\u304c\u9ad8\u3044\u5834\u5408\u300d<\/strong><\/span>\u306f\u3053\u3061\u3089\u3092\u4f7f\u3046\u3002\u307e\u305f\u3001\u4e3b\u8868\u5074\u3082\u5f93\u8868\u5074\u3082\u3069\u3061\u3089\u3082\u9078\u629e\u6027\u304c\u4f4e\u3044\u5834\u5408\u306fIN\u3067\u306f\u306a\u304fEXISTS\u3092\u4f7f\u3048\u3070\u826f\u3044\u3067\u3059\u3002<\/p>\n<h2>JOIN\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h2>\n<p>\u7d50\u8ad6\u304b\u3089\u8a00\u3048\u3070\u4e0b\u8a18\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">\u5225\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u51fa\u529b\u5bfe\u8c61\u306b\u3057\u305f\u3044\u5834\u5408\uff1aJOIN\u3092\u4f7f\u3046\u3002\r\n\u5225\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u62bd\u51fa\u6761\u4ef6\u306b\u4f7f\u7528\u3059\u308b\u3060\u3051\u306e\u5834\u5408\uff1aEXISTS\u3001IN\u3092\u4f7f\u3046\u3002<\/pre>\n<h3>JOIN\u3067\u3082\u540c\u3058\u3053\u3068\u3067\u304d\u308b\u3058\u3083\u3093\uff1f<\/h3>\n<p>1\uff1a1\u306a\u3089JOIN\u3067\u3082EXISTS\u3067\u3082\u7d50\u679c\u306f\u5909\u308f\u3089\u306a\u3044\u306e\u3067\u3059\u304c\u30011\uff1aN\u306e\u5834\u5408\u306f\u91cd\u8907\u3057\u305f\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u3066\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002DISTINCT\u3084GROUP BY\u3092\u4f7f\u3048\u3070\u826f\u3044\u306e\u3067\u3059\u304c\u3001<span style=\"color: #ff0000;\"><strong>\u300c<\/strong><strong>DISTINCT\u300d\u3084\u300c<\/strong><\/span><span style=\"color: #ff0000;\"><strong>GROUP BY\u300d\u306f\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308b\u51e6\u7406\u306b\u306a\u308b<\/strong><\/span>\u306e\u3067\u3067\u304d\u308c\u3070\u4f7f\u3044\u305f\u304f\u306f\u306a\u3044\u3067\u3059\u3002\u306a\u306e\u3067\u3001EXISTS\u3092\u4f7f\u3063\u305f\u65b9\u304c\u826f\u3044\u306e\u3067\u3059\u3002<\/p>\n<h3>JOIN\u3092\u4f7f\u3063\u305f\u65b9\u304c\u826f\u3044\u30b1\u30fc\u30b9<\/h3>\n<p>\u305f\u3060\u3001\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u306e\u60c5\u5831\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306fJOIN\u3092\u4f7f\u308f\u3056\u308b\u304a\u3048\u306a\u3044\u3067\u3059\u3002\u5927\u4e8b\u306a\u306e\u306f\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u3088\u304f\u3001EXISTS\u306e\u65b9\u304c\u901f\u3044\u306e\u3067EXISTS\u3092\u4f7f\u3046\u3079\u304d\u3068\u8a00\u308f\u308c\u3066\u3044\u305f\u308a\u3057\u307e\u3059\u304c\u3001\u305d\u308c\u306f\u9593\u9055\u3044\u3067\u3059\u3002\u7528\u9014\u306b\u5408\u308f\u305b\u3066\u4f7f\u3063\u3066\u3044\u304f\u306e\u304c\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u306b\u306a\u308a\u307e\u3059\u3002 \u7d50\u8ad6 \u3044\u308d\u3044\u308d\u8abf\u67fb\u3057\u3066\u307f\u305f\u7d50\u679c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f7f\u3044\u5206\u3051\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002 [&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\/14768"}],"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=14768"}],"version-history":[{"count":20,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14768\/revisions"}],"predecessor-version":[{"id":20583,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14768\/revisions\/20583"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14768"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14768"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}