{"id":14625,"date":"2021-09-26T15:58:05","date_gmt":"2021-09-26T06:58:05","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=14625"},"modified":"2023-05-06T18:09:35","modified_gmt":"2023-05-06T09:09:35","slug":"%e3%80%90%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%80%91%e3%82%a4%e3%83%b3%e3%83%87%e3%83%83%e3%82%af%e3%82%b9%e3%81%8c%e5%8a%b9%e3%81%8b%e3%81%aa%e3%81%84%e3%82%b1%e3%83%bc%e3%82%b9","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=14625","title":{"rendered":"\u3010\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3011\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304b\u306a\u3044\u30b1\u30fc\u30b9"},"content":{"rendered":"<h2>\u691c\u7d22\u7d50\u679c\u304c\u591a\u3044<\/h2>\n<p>\u691c\u7d22\u7d50\u679c\u304c\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u306e20%\u672a\u6e80\uff08\u5b9f\u52d9\u3067\u306f10%\u672a\u6e80\u3092\u76ee\u6a19\u306b\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u3002\uff09\u3001\u6b63\u76f4\u9078\u629e\u7387\u304c10%\u3092\u8d85\u3048\u3066\u3044\u305f\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b9\u30ad\u30e3\u30f3\u3088\u308a\u3082\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u306e\u65b9\u304c\u671b\u307e\u3057\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>\u5168\u4f53\u306e\u4ef6\u6570\u304c\u5c11\u306a\u3044<\/h2>\n<p>\u6570\u4e07\u301c\u6570\u5341\u30de\u30f3\u884c\u304c\u76ee\u5b89\u306b\u306a\u308a\u307e\u3059\u30021000\u884c\u7a0b\u5ea6\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u3042\u308c\u3070index\u3088\u308a\u3082\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u304c\u52b9\u7387\u7684\u3067\u3059\u3002<\/p>\n<h2>\u6761\u4ef6\u306b\u305d\u306e\u5217\u3092\u4f7f\u3063\u3066\u306a\u3044\u3002<\/h2>\n<p>\u3053\u308c\u3082\u5f53\u305f\u308a\u524d\u3067\u3059\u306d\u3002\u3053\u308c\u3060\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u308f\u308c\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:default decode:true\">SELECT * FROM users WHERE num*10 &gt; 100;<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u4fee\u6b63\u3059\u308b\u3068\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:default decode:true\">SELECT * FROM users WHERE num &gt; 100\/10;<\/pre>\n<h2>LIKE\u691c\u7d22\uff08\u3042\u3044\u307e\u3044\u691c\u7d22\uff09\u306f\u524d\u65b9\u4e00\u81f4\u3057\u304b\u52b9\u304b\u306a\u3044<\/h2>\n<pre class=\"lang:default decode:true\">SELECT * FROM users WHERE name LIKE '%\u7530\u4e2d%';<\/pre>\n<p>\u30ab\u30e9\u30e0name\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u9069\u7528\u3057\u305f\u5834\u5408\u306b\u306f\u3001\u524d\u65b9\u4e00\u81f4(\u4e0a\u8a18\u4f8b\u3067\u8a00\u3048\u3070\u300c\u7530\u4e2d%\u300d)\u306e\u307f\u3067\u3057\u304b\u52b9\u304d\u307e\u305b\u3093\u3002\u4e2d\u9593\u4e00\u81f4(\u300c%\u7530\u4e2d%\u300d)\u3084\u5f8c\u65b9\u4e00\u81f4(\u300c%\u7530\u4e2d\u300d)\u3067\u306f\u52b9\u304b\u306a\u3044\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>\u691c\u7d22\u6761\u4ef6\u306bIS NULL\u3092\u4f7f\u3063\u3066\u3044\u308b\u3002<\/h2>\n<pre class=\"lang:default decode:true\">SELECT * FROM users WHERE name IS NULL;<\/pre>\n<p>\u3053\u308c\u3082\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u52b9\u304d\u307e\u305b\u3093\u3002\u727d\u5f15\u30c7\u30fc\u30bf\u306e\u4e2d\u306b\u306f\u901a\u5e38NULL\u306f\u542b\u307e\u308c\u306a\u3044\u306e\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u52b9\u304d\u307e\u305b\u3093\u3002<\/p>\n<h2>\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u3082\u52b9\u304b\u306a\u3044\u3002<\/h2>\n<pre class=\"lang:default decode:true \">SELECT * FROM users WHERE LENGTH(name) = 5;<\/pre>\n<p>\u3053\u308c\u3082\u727d\u5f15\u5217\u306b\u56db\u5247\u6f14\u7b97\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u3068\u540c\u69d8\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u9069\u7528\u3055\u308c\u307e\u305b\u3093\u3002\u7406\u7531\u3068\u3057\u3066\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e2d\u306b\u5b58\u5728\u3059\u308b\u5024\u306f\u3042\u304f\u307e\u3067name\u3067\u3042\u308a\u3001LENGTH(name)\u306e\u8a08\u7b97\u7d50\u679c\u3067\u306f\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n<h2>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306e\u4f4e\u3044\u5217\u306b\u5bfe\u3059\u308b\u691c\u7d22<\/h2>\n<h3>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3068\u306f\uff1f<\/h3>\n<p>\u300c\u5217\u306b\u683c\u7d0d\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306e\u5024\u306b\u3069\u308c\u304f\u3089\u3044\u306e\u7a2e\u985e\u304c\u3042\u308b\u306e\u304b\uff1f\u300d\u306e\u3053\u3068\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u7a2e\u985e\u304c\u5c11\u306a\u304f\u91cd\u8907\u304c\u591a\u3044\u5217\u306e\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u52b9\u304b\u306a\u3044\u3067\u3059\u3002<\/p>\n<h2>\u3042\u3044\u307e\u3044\u691c\u7d22<\/h2>\n<p>\u524d\u65b9\u4e00\u81f4\u3068\u5b8c\u5168\u4e00\u81f4\u3057\u304b\u52b9\u304d\u307e\u305b\u3093\u3002<\/p>\n<h2>\u7d71\u8a08\u60c5\u5831\u3068\u5b9f\u969b\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u4e56\u96e2\u304c\u3042\u308b\u5834\u5408<\/h2>\n<h3>\u7d71\u8a08\u60c5\u5831\u3068\u306f\uff1f<\/h3>\n<p>\u5b9a\u671f\u7684\u306b\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u4e00\u5b9a\u6570\u306e\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3092\u884c\u3044\u305d\u308c\u3092\u5143\u306b\u4f5c\u3089\u308c\u308b\u60c5\u5831\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3001\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u300c\u5b9f\u969b\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u5206\u5e03\u3068\u4e56\u96e2\u3057\u305f\u7d71\u8a08\u60c5\u5831\u300d\u304c\u4f5c\u3089\u308c\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u306e\u524d\u306b\u5927\u91cf\u30c7\u30fc\u30bf\u66f4\u65b0\u304c\u884c\u308f\u308c\u305f\u5834\u5408\uff08\u30d0\u30c3\u30c1\u3067\u5927\u91cf\u306binsert\u3001update\u3057\u305f\u5834\u5408\u306a\u3069\uff09<\/h3>\n<h3>\u30b5\u30f3\u30d7\u30ea\u30f3\u30b0\u3067\u504f\u3063\u305f\u30c7\u30fc\u30bf\u3092\u53ce\u96c6\u3057\u305f\u5834\u5408<\/h3>\n<p>\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001\u7d71\u8a08\u60c5\u5831\u306e\u66f4\u65b0\u3092\u884c\u3046\u304b\u3001\u5229\u7528\u3059\u308b\u7d71\u8a08\u60c5\u5831\u3092\u56fa\u5b9a\u3059\u308b\u65b9\u6cd5\uff08\u30d2\u30f3\u30c8\u53e5\uff09\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u691c\u7d22\u7d50\u679c\u304c\u591a\u3044 \u691c\u7d22\u7d50\u679c\u304c\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u306e20%\u672a\u6e80\uff08\u5b9f\u52d9\u3067\u306f10%\u672a\u6e80\u3092\u76ee\u6a19\u306b\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u3002\uff09\u3001\u6b63\u76f4\u9078\u629e\u7387\u304c10%\u3092\u8d85\u3048\u3066\u3044\u305f\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b9\u30ad\u30e3\u30f3\u3088\u308a\u3082\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u306e\u65b9\u304c\u671b\u307e\u3057\u3044\u3067\u3057\u3087\u3046\u3002 \u5168\u4f53\u306e\u4ef6\u6570\u304c\u5c11\u306a\u3044 \u6570 [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14625"}],"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=14625"}],"version-history":[{"count":3,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14625\/revisions"}],"predecessor-version":[{"id":19528,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/14625\/revisions\/19528"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14625"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}