{"id":13911,"date":"2021-08-01T19:43:40","date_gmt":"2021-08-01T10:43:40","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=13911"},"modified":"2023-05-28T08:28:53","modified_gmt":"2023-05-27T23:28:53","slug":"%e3%80%90%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e8%a8%ad%e8%a8%88%e3%80%91%e3%82%a2%e3%83%b3%e3%83%81%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=13911","title":{"rendered":"\u3010\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u3011\u30c6\u30fc\u30d6\u30eb\u8a2d\u8a08\u306e\u6307\u91dd\u3001\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3"},"content":{"rendered":"<h2>\u30c6\u30fc\u30d6\u30eb\u8a2d\u8a08\u306e\u6307\u91dd<\/h2>\n<h3>\u7279\u5b9a\u306e\u5024\u4ee5\u5916\u5165\u308c\u3066\u6b32\u3057\u304f\u306a\u3044\u30ab\u30e9\u30e0\u306fCHECK\u5236\u7d04\u3092\u4f7f\u3046\u3002<\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u524a\u9664\u30d5\u30e9\u30b0\u306a\u3069\u30671\u30012\u306e\u307f\u3057\u304b\u5165\u3063\u3066\u6b32\u3057\u304f\u306a\u3044\u5834\u5408\u306a\u3069\u306f\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001MySQL\u3067\u306fCHECK\u5236\u7d04\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002\uff088.0.16\u4ee5\u964d\u3067\u306f\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\uff09<\/p>\n<h3>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u3092\u4f7f\u3046\u3002<\/h3>\n<p>\u305f\u307e\u306b\u300c\u30a2\u30d7\u30ea\u5074\u3067\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u884c\u3048\u3070\u826f\u3044\u300d\u3068\u3044\u3046\u8003\u3048\u306e\u4eba\u3082\u3044\u307e\u3059\u304c\u3001DB\u5074\u3067\u3061\u3083\u3093\u3068\u5236\u9650\u3057\u307e\u3057\u3087\u3046\u3002\u30a2\u30d7\u30ea\u306e\u30d0\u30b0\u3068\u304b\u3067\u60f3\u5b9a\u5916\u306e\u5024\u304c\u6df7\u5165\u3059\u308b\u53ef\u80fd\u6027\u3082\u3042\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<h3>\u65e5\u4ed8\u30c7\u30fc\u30bf\u306e\u6301\u305f\u305b\u65b9<\/h3>\n<h4>DATETIME\u578b\u3067\u6642\u9593\u307e\u3067\u6301\u305f\u305b\u308b\u65b9\u6cd5<\/h4>\n<p>\u57fa\u672c\u7684\u306b\u3053\u308c\u3067\u7d71\u4e00\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<h4>\u6587\u5b57\u5217\u3067\u6301\u305f\u305b\u308b\u65b9\u6cd5<\/h4>\n<p>\u3053\u308c\u3082\u4e00\u3064\u306e\u624b\u3067\u3059\u304c\u3001\u59a5\u5f53\u6027\u3092\u78ba\u5b9f\u306b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u306a\u3044\u306e\u3067\u300113\u6708\u3060\u3068\u304b\u300132\u65e5\u3060\u3068\u304b\u767b\u9332\u3055\u308c\u308b\u306f\u305a\u304c\u306a\u3044\u30c7\u30fc\u30bf\u307e\u3067\u767b\u9332\u3067\u304d\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u4f7f\u308f\u306a\u3044\u65b9\u304c\u826f\u3044\u3067\u3059\u3002<\/p>\n<h4>DATE\u578b\u3067\u6642\u9593\u3092\u3082\u305f\u305b\u306a\u3044\u65b9\u6cd5<\/h4>\n<p>\u305d\u306e\u5834\u5408\u306f\u3001\u57fa\u672c\u7684\u306bHH:MM:SS\u306f\u5168\u30660\u3067\u767b\u9332\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h5>\u30c7\u30e1\u30ea\u30c3\u30c8<\/h5>\n<p>\u3082\u3057\u8aa4\u3063\u3066NOW\u95a2\u6570\u306a\u3069\u3067\u73fe\u5728\u306e\u65e5\u4ed8\u306a\u3069\u3092\u767b\u9332\u3057\u3066\u3057\u307e\u3046\u3068\u6642\u9593\u60c5\u5831\u307e\u3067\u5165\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001select\u3067\u306e\u691c\u7d22\u7d50\u679c\u304c\u304a\u304b\u3057\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n<h2>\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h2>\n<h3>\u7528\u9014\u304c\u5206\u304b\u308a\u306b\u304f\u3044\u30ab\u30e9\u30e0\u304c\u3042\u308b\u3002<\/h3>\n<ul>\n<li>\u30ab\u30e9\u30e0\u540d\u304c\u7701\u7565\u7cfb<\/li>\n<li>\u4ed6\u306e\u30ab\u30e9\u30e0\u306e\u5185\u5bb9\u306b\u4f9d\u5b58\u3057\u3066\u5024\u306e\u610f\u5473\u304c\u5909\u308f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<li>\u30ab\u30e9\u30e0\u304b\u3089\u53d6\u5f97\u3057\u305f\u6587\u5b57\u5217\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u5206\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<li>\u30de\u30b8\u30c3\u30af\u30ca\u30f3\u30d0\u30fc\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u3002<\/li>\n<li>\u81ea\u7531\u9805\u76ee\u3084\u4e88\u5099\u9805\u76ee\u306a\u3069\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<h3>\u5de8\u5927\u306a\u30c6\u30fc\u30d6\u30eb<\/h3>\n<h3>NULL\u5024\u304c\u5165\u3063\u305f\u30ab\u30e9\u30e0<\/h3>\n<p>\u3082\u3057\u3001\u4ed6\u306e\u9805\u76ee\u304cNULL\u4ee5\u5916\u306e\u5024\u304c\u5165\u308b\u306e\u306b\u3001NULL\u304c\u5165\u308b\u30ab\u30e9\u30e0\u304c\u3042\u308b\u306e\u3067\u3042\u308c\u3070\u3001\u305d\u308c\u306f\u5225\u30c6\u30fc\u30d6\u30eb\u306b\u5207\u308a\u51fa\u3059\u3079\u304d\u3002<\/p>\n<p>\u9593\u9055\u3063\u3066\u3082\u3001unknown\u30849999\u3092\u5165\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u306f\u3044\u3051\u306a\u3044\u3002<\/p>\n<h3>\u9069\u5207\u306a\u578b\u3092\u4f7f\u3046\u3002<\/h3>\n<p>TEXT\u578b\u3084LOB\u578b\u306f\u3042\u307e\u308a\u4f7f\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u3002<\/p>\n<p>\u4f55\u3067\u3082\u304b\u3093\u3067\u3082VARCHAR\u3067\u3082\u3044\u3051\u306a\u3044\u3002<\/p>\n<h3>\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u95a2\u4fc2\u304c\u5206\u304b\u308a\u306b\u304f\u3044\u3002<\/h3>\n<ul>\n<li>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u304c\u306a\u3044\u3002<\/li>\n<li>\u30ad\u30fc\u3068\u306a\u308b\u30ab\u30e9\u30e0\u306e\u540d\u524d\u306b\u4e00\u8cab\u6027\u304c\u306a\u3044\u3002<\/li>\n<\/ul>\n<h3>\u8907\u6570\u306e\u76ee\u7684\u306e\u30c6\u30fc\u30d6\u30eb<\/h3>\n<p>\u57fa\u672c\u7684\u306b<span style=\"color: #ff0000;\"><strong>\u300c\u8907\u6570\u306e\u76ee\u7684\u306b\u4f7f\u308f\u308c\u308b\u30c6\u30fc\u30d6\u30eb\u300d<\/strong><\/span>\u306f\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>\u4f8b<\/h4>\n<p>\u300c\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u300d\u3068\u300c\u7ba1\u7406\u8005\u30e6\u30fc\u30b6\u30fc\u300d\u3092\u4e00\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u7ba1\u7406\u3059\u308b\u3002<\/p>\n<h4>\u898b\u5206\u3051\u65b9<\/h4>\n<ul>\n<li>\u30c7\u30fc\u30bf\u306e\u5c5e\u6027\u306b\u3088\u3063\u3066\u5165\u308b\u5024\u304c\u5909\u308f\u308b\u3002<\/li>\n<li>NULL\u304c\u5165\u308b\u3088\u3046\u306a\u30ab\u30e9\u30e0\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<h4>\u30e1\u30ea\u30c3\u30c8<\/h4>\n<ul>\n<li>\u30e2\u30c7\u30eb\u3068\u3057\u3066\u3082\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308b\u3002<\/li>\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u3082\u826f\u3044\u3002<\/li>\n<\/ul>\n<h3>\u300c\u8907\u6570\u306e\u610f\u5473\u3092\u542b\u3093\u3060ID\u300d\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h3>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u7ba1\u7406\u65b9\u6cd5\u306f\u7ba1\u7406\u30ab\u30e9\u30e0\u306e\u6570\u304c\u6e1b\u308b\u306e\u3067\u826f\u3055\u305d\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u57fa\u672c\u7684\u306b\u306f\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u300c\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u300d\u304b\u300c\u7ba1\u7406\u8005\u30e6\u30fc\u30b6\u30fc\u300d\u304b\u3092\u300c\u30e6\u30fc\u30b6\u30fcID\u306e\u5148\u982d1\u6841\u76ee\u300d\u3067\u5224\u65ad\u3059\u308b\u3002<\/li>\n<li>\u300c100(\u5e02ID)121(\u753aID)\u300d\u306a\u3069\u306e\u3088\u3046\u306bID\u306e\u4e2d\u306b\u8907\u6570\u306e\u610f\u5473\u3092\u6301\u305f\u305b\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u3046\u3044\u3063\u305fID\u306f<span style=\"color: #ff0000;\"><strong>\u300c\u610f\u5473\u3092\u542b\u3093\u3060ID\u300d\u3001\u300c\u30b9\u30de\u30fc\u30c8ID\u300d\u3001\u300c\u8ad6\u7406ID\u300d<\/strong><\/span>\u3068\u547c\u3093\u3060\u308a\u3057\u307e\u3059\u3002<\/p>\n<h4>\u30c7\u30e1\u30ea\u30c3\u30c8<\/h4>\n<h5>\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u8907\u96d1\u5316\u3059\u308b\u3002<\/h5>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u72b6\u614b\u3092\u8abf\u3079\u308b\u305f\u3081\u306b\u3044\u3061\u3044\u3061substring\u306a\u3069\u3067\u6574\u5f62\u3059\u308b\u95a2\u6570\u3092\u4f5c\u3089\u306a\u3044\u3068\u3044\u3051\u306a\u3044\uff08\u30ab\u30e9\u30e0\u76f4\u63a5\u78ba\u8a8d\u3067\u6e08\u307e\u305b\u308c\u306a\u3044\uff09<\/p>\n<h5>\u96c6\u8a08\u304c\u3057\u306b\u304f\u3044\u3002<\/h5>\n<p>\u3042\u3068\u3067\u3001\u96c6\u8a08\u304c\u5fc5\u8981\u306b\u306a\u3063\u305f\u5834\u5408\u306bcount\u3082group by\u3082\u4f7f\u3048\u305a\u306bSQL\u95a2\u6570\u3067\u4e00\u65e6\u52a0\u5de5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<p>substr\u306a\u3069\u306eSQL\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3057\u307e\u3046\u3068\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u307e\u3067RDBMS\u3067\u306f\u7d50\u679c\u304c\u308f\u304b\u3089\u306a\u3044\u306e\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304d\u307e\u305b\u3093\u3002\u3088\u3063\u3066\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u306b\u306a\u308b\u306e\u3067\u975e\u5e38\u306b\u51e6\u7406\u901f\u5ea6\u3082\u9045\u304f\u306a\u308a\u307e\u3059\u3002\u958b\u767a\u9762\u3084\u904b\u7528\u9762\u3067\u306e\u30b3\u30b9\u30c8\u3082\u4e0a\u304c\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<h3>UPDATE\u6587\u3092\u4f7f\u3063\u3066\u3044\u308b\u3002<\/h3>\n<p>DELETE\u3001INSERT\u6587\u306e\u5bfe\u3067\u5b9f\u884c\u3059\u308b\u306e\u304c\u826f\u3044\u3002<\/p>\n<p>UPDATE\u306f\u30c7\u30fc\u30bf\u4e0d\u6574\u5408\u304c\u6df7\u5165\u3057\u3084\u3059\u3044\u52d5\u4f5c\u3002\u30ed\u30b8\u30c3\u30af\u3082\u30b7\u30f3\u30d7\u30eb\u306b\u306a\u308b\u3002<\/p>\n<h3>\u6761\u4ef6\u306b\u3088\u3063\u3066\u66f4\u65b0\u3059\u308b\u3068\u3044\u3046UPDATE\u6587\u3092\u4f7f\u3046\u3002<\/h3>\n<p>\u307e\u305f\u3001UPDATE\u6587\u3092\u4eee\u306b\u4f7f\u3046\u3068\u3057\u3066\u3082\u6761\u4ef6\u306e\u9055\u3044\u306b\u3088\u3063\u3066\u4f55\u5ea6\u3082UPDATE\u6587\u3092\u4f7f\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u30c7\u30e1\u30ea\u30c3\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u6761\u4ef6\u306e\u9055\u3044\u306b\u3088\u3063\u3066\u4f55\u5ea6\u3082UPDATE\u6587\u3092\u767a\u884c\u3057\u3066\u3057\u307e\u3046\u306e\u306f\u4ee5\u4e0b\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u306e\u3067\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u304b\u306a\u3044\u30b1\u30fc\u30b9\u3082\u3042\u308a\u6027\u80fd\u304c\u60aa\u304f\u306a\u308b\u3002<\/li>\n<li>\u524d\u306eUPDATE\u5185\u5bb9\u304c\u5f8c\u7d9a\u306eUPDATE\u5185\u5bb9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u3066\u3057\u307e\u3046\u3002<\/li>\n<\/ul>\n<p>\u305d\u3046\u3044\u3046\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306bCASE\u6587\u3092\u4f7f\u3063\u3066\u4e00\u62ec\u3067UPDATE\u6587\u3092\u5b9f\u884c\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:default decode:true\">UPDATE\r\n SET \u66f4\u65b0\u5024 = CASE\r\n   WHEN \u6761\u4ef61 THEN \u50241\r\n   WHEN \u6761\u4ef62 THEN \u50242\r\n END\u306a<\/pre>\n<p>\u306a\u304a\u3001\u6761\u4ef6\u3068\u5024\u306e\u7d44\u307f\u5408\u308f\u305b\u3092SQL\u306e\u4e2d\u306b\u30cf\u30fc\u30c9\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3057\u3066\u57cb\u3081\u8fbc\u3093\u3067\u3057\u307e\u3046\u306e\u306f\u4fdd\u5b88\u3057\u305a\u3089\u304f\u306a\u308b\u305f\u3081<span style=\"color: #ff0000;\"><strong>\u305d\u308c\u3089\u3092\u5b9a\u7fa9\u3057\u305f<\/strong><strong>\u300c\u30d1\u30bf\u30e1\u30fc\u30bf\u30c6\u30fc\u30d6\u30eb\u300d\u3084\u4e8b\u524d\u306b\u7d50\u679c\u3092\u96c6\u8a08\u3057\u3066\u304a\u304f\u300c\u30c6\u30f3\u30dd\u30e9\u30ea\u30c6\u30fc\u30d6\u30eb\u300d<\/strong><\/span>\u3092\u4f7f\u3046\u3088\u3046\u306b\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u3002<\/p>\n<p>\u300c\u30c6\u30f3\u30dd\u30e9\u30ea\u30c6\u30fc\u30d6\u30eb\uff08\u96c6\u8a08\u7d50\u679c\uff09\u300d\u3068\u300c\u30d1\u30e9\u30e1\u30fc\u30bf\u30c6\u30fc\u30d6\u30eb\u300d\u3092JOIN\u3057\u3066\u3001\u6761\u4ef6\u306b\u5408\u3046\u3082\u306e\u306f\u66f4\u65b0\u3059\u308b\u3001\u5408\u308f\u306a\u3044\u3082\u306e\u306f\u305d\u306e\u307e\u307e\u307f\u305f\u3044\u306a\u611f\u3058\u306e\u8a2d\u8a08\u306b\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<h4>\u30c6\u30f3\u30dd\u30e9\u30ea\u30c6\u30fc\u30d6\u30eb<\/h4>\n<p>\u4f8b\u3048\u3070\u3001\u5f53\u6708\u306e\u96c6\u8a08\u7d50\u679c\u306a\u3069\u306e\u60c5\u5831\u306e\u305f\u3081\u3060\u3051\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u3063\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u96c6\u8a08\u306e\u969b\u306eSELECT\u6587\u306b\u306f\u30ed\u30c3\u30af\u304c\u304b\u304b\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u30c6\u30f3\u30dd\u30e9\u30ea\u30c6\u30fc\u30d6\u30eb\uff08\u96c6\u8a08\u7d50\u679c\uff09\u3092\u4f5c\u3089\u305a\u306b1\u6587\u3067UPDATE\u3059\u308b\u3053\u3068\u306f\u57fa\u672c\u7684\u306b\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h4>\u30d1\u30e9\u30e1\u30fc\u30bf\u30c6\u30fc\u30d6\u30eb<\/h4>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c6\u30fc\u30d6\u30eb\u3067\u3059\u3002\u4f8b\u3067\u306f\u30e9\u30f3\u30af\u3092\u6c7a\u3081\u308b\u306b\u3042\u305f\u3063\u3066\u306e\u6761\u4ef6\u3092\u8a18\u8f09\u3057\u305f\u308a\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u3046\u3053\u3068\u3067\u8a2d\u5b9a\u30c7\u30fc\u30bf\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u30b3\u30fc\u30c9\u306b\u306f\u5909\u66f4\u304c\u53ca\u3070\u306a\u3044\u305f\u3081\u4fdd\u5b88\u4f5c\u696d\u30b3\u30b9\u30c8\u3092\u4e0b\u3052\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<table>\n<tbody>\n<tr>\n<th>\u73fe\u30e9\u30f3\u30af<\/th>\n<th>UP\u30e9\u30f3\u30af<\/th>\n<th>DOWN\u30e9\u30f3\u30af<\/th>\n<th>UP\u6761\u4ef6<\/th>\n<th>DOWN\u6761\u4ef6<\/th>\n<\/tr>\n<tr>\n<td>A<\/td>\n<td>NULL<\/td>\n<td>B<\/td>\n<td>NULL<\/td>\n<td>50<\/td>\n<\/tr>\n<tr>\n<td>B<\/td>\n<td>A<\/td>\n<td>C<\/td>\n<td>50<\/td>\n<td>20<\/td>\n<\/tr>\n<tr>\n<td>C<\/td>\n<td>B<\/td>\n<td>D<\/td>\n<td>20<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>D<\/td>\n<td>C<\/td>\n<td>NULL<\/td>\n<td>10<\/td>\n<td>NULL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong>\u300c\u5b50\u30c6\u30fc\u30d6\u30eb\u304c\u8907\u6570\u306e\u89aa\u30c6\u30fc\u30d6\u30eb\u3092\u6301\u3064\u300d<\/strong>\u3088\u3046\u306a\u8a2d\u8a08(\u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30c3\u30af)<\/h3>\n<p>\u5b50\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u308b\u30ab\u30e9\u30e0\u306e\u5024\u306b\u3088\u3063\u3066\u7d10\u3065\u304f\u89aa\u30c6\u30fc\u30d6\u30eb\u304c\u5909\u308f\u308b\u3068\u8a00\u3046\u8a2d\u8a08\u3067\u3059\u306d\u3002<\/p>\n<h4>\u30c7\u30e1\u30ea\u30c3\u30c8<\/h4>\n<h5>\u5916\u90e8\u30ad\u30fc\u304c\u4f7f\u3048\u306a\u3044\u3002<\/h5>\n<p>\u30a2\u30d7\u30ea\u5074\u3068\u3057\u3066\u306fJOIN\u3059\u308b\u5bfe\u8c61\u304c\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3057\u3066\u307f\u308b\u307e\u3067\u308f\u304b\u3089\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u89aa\u30c6\u30fc\u30d6\u30eb\u306e\u4e21\u65b9\u3092JOIN\u3057\u3066\u304b\u3089NULL\u306e\u5834\u6240\u306b\u3088\u3063\u3066\u5bfe\u8c61\u30c7\u30fc\u30bf\u3092\u5224\u65ad\u3059\u308b\u3068\u8a00\u3046\u3088\u3046\u306a\u904b\u7528\u304c\u884c\u308f\u308c\u304b\u306d\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u975e\u5e38\u306b\u975e\u52b9\u7387\u306a\u30af\u30a8\u30ea\u3067\u3059\u3002<\/p>\n<p>\u5916\u90e8\u30ad\u30fc\u304c\u4f7f\u3048\u306a\u3044\u306e\u3067\u53c2\u7167\u6574\u5408\u6027\u306f\u62c5\u4fdd\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h3>\u30da\u30fc\u30b8\u30e3\u30fc\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff08LIMIT\u3001OFFSET\uff09<\/h3>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u30da\u30fc\u30b8\u30e3\u30fc\u3092\u5c0e\u5165\u3059\u308b\u5834\u5408\u306f<span style=\"color: #ff0000;\"><strong>ORDER BY\u306e\u300cLIMIT\u300d\u3068\u300cOFFSET\u300d<\/strong><\/span>\u3092\u5229\u7528\u3059\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u5b9f\u306f\u3053\u308c\u3082\u4f55\u306b\u3082\u8003\u3048\u305a\u306b\u4f7f\u3063\u3066\u3044\u308b\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u843d\u3068\u3057\u7a74\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>OFFSET<\/h4>\n<p>\u3069\u3053\u304b\u3089\u30c7\u30fc\u30bf\u53d6\u5f97\u3092\u958b\u59cb\u3059\u308b\u304b\u306e\u5024\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u5024\u304c\u5927\u304d\u304f\u306a\u308c\u3070\u306a\u308b\u307b\u3069\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u51fa\u3059\u4ef6\u6570\u304c\u5897\u3048\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>\u89e3\u6c7a\u7b56<\/h4>\n<h5>OFFSET\u306f\u5ec3\u6b62\u3057\u3066where\u53e5\u3067\u4e8b\u524d\u306b\u7d5e\u308a\u8fbc\u3080<\/h5>\n<p>OFFSET\u306f\u5ec3\u6b62\u3057\u3066\u3001where\u53e5\u3067\u300c\u524d\u30da\u30fc\u30b8\u6700\u5f8c\u306e\u884c\u306eid\u4ee5\u4e0a\u300d\u3068\u8a00\u3046\u6761\u4ef6\u3092\u4ed8\u3051\u52a0\u3048\u3066\u3042\u3052\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067OFFSET\u306e\u5024\u304c\u80a5\u5927\u5316\u3059\u308b\u305f\u3073\u306b\u691c\u7d22\u5bfe\u8c61\u306e\u884c\u6570\u304c\u5897\u5927\u3057\u3066\u3057\u307e\u3046\u3068\u8a00\u3046\u73fe\u8c61\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h6>\u4f7f\u3048\u306a\u3044\u30b1\u30fc\u30b9<\/h6>\n<p>\u305f\u3060\u3057\u3001\u3053\u306e\u624b\u6cd5\u306f\u4ee5\u4e0b\u306e\u30b1\u30fc\u30b9\u3067\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002<\/p>\n<h6>ORDER BY\u53e5\u306e\u7d50\u679c\u304cid\u306e\u9806\u756a\u3068\u306f\u95a2\u4fc2\u306a\u304f\u3001\u307e\u305f\u306fUNIQUE\u306a\u5024\u3067\u306f\u306a\u3044\u3002<\/h6>\n<p>\u4f8b\u3048\u3070\u3001name\u306a\u3069\u306e\u30e6\u30cb\u30fc\u30af\u3067\u306f\u306a\u3044\u5024\u306e\u5834\u5408\u306a\u3069\u3002<\/p>\n<h6>UNION\u3084\u3001GROUP BY\u3084HAVING\u304c\u4f7f\u3044\u305f\u3044\u5834\u5408<\/h6>\n<p>GROUP BY\u306a\u3069\u3067\u306fid\u304c\u4f7f\u3048\u306a\u3044\u3002\u307e\u305f\u3001\u3053\u308c\u3089\u306b\u306f\u300cORDER BY\u53e5\u72d9\u3044\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u300d\u304c\u4f7f\u3048\u306a\u3044\u305f\u3081\u9045\u304f\u306a\u308b\u3002<\/p>\n<h3>\u5236\u7d04\u3092\u304b\u3051\u3059\u304e\u308b\uff1a\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u304c\u751f\u307f\u51fa\u3059\u30c7\u30c3\u30c9\u30ed\u30c3\u30af<\/h3>\n<p>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306e\u5b50\u30c6\u30fc\u30d6\u30eb\u3092\u66f4\u65b0\u3059\u308b\u3068\u3001\u89aa\u30c6\u30fc\u30d6\u30eb\u306e\u5171\u6709\u30ed\u30c3\u30af\u3092\u81ea\u52d5\u7684\u306b\u53d6\u308b\u306e\u3067\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u6e29\u5e8a\u3068\u306a\u308b\u3002<\/p>\n<p>\u305d\u306e\u5bfe\u7b56\u3068\u3057\u3066\u306f\u3001\u6392\u4ed6\u30ed\u30c3\u30af\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u304c\u826f\u3044\u304c\u3001\u6392\u4ed6\u30ed\u30c3\u30af\u306f\u6b63\u3057\u304f\u9806\u756a\u3092\u6301\u305f\u305b\u308b\u305f\u3081\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3068\u306a\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n<h3>multirow insert(\u30d0\u30eb\u30af\u30a4\u30f3\u30b5\u30fc\u30c8)\u3092\u4f7f\u3046\u3002<\/h3>\n<p>\u8907\u6570\u306eINSERT\u6587\u3092\u4e00\u62ec\u5b9f\u884c\u3067\u304d\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n<h4>\u69cb\u6587<\/h4>\n<pre class=\"lang:default decode:true\">INSERT INTO \u30c6\u30fc\u30d6\u30eb\u540d (\u52171, \u52172\u3001\u30fb\u30fb\u30fb) VALUES('\u50241', '\u50242'\u30fb\u30fb\u30fb),('\u50243', '\u50244'\u30fb\u30fb\u30fb),<\/pre>\n<h4>\u30e1\u30ea\u30c3\u30c8<\/h4>\n<ul>\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u826f\u3044\u3002<\/li>\n<\/ul>\n<h4>\u30c7\u30e1\u30ea\u30c3\u30c8<\/h4>\n<ul>\n<li>\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044DBMS\u3082\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u6642\u306b\u3069\u306e\u884c\u3067\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u306e\u304b\u304c\u5206\u304b\u308a\u306b\u304f\u3044\u3002<\/li>\n<\/ul>\n<h3>\u30eb\u30fc\u30d7\u306e\u4e2d\u3067\u5358\u7d14\u306aSQL\u3092\u547c\u3073\u51fa\u3059\u3002<\/h3>\n<p>SELECT\u3067\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066\u3001\u30eb\u30fc\u30d7\u306e\u4e2d\u3067\u5358\u7d14\u306aINSERT\u6587\u3092\u4f55\u5ea6\u3082\u547c\u3073\u51fa\u3059\u307f\u305f\u3044\u306a\u51e6\u7406\u3092\u66f8\u3044\u305f\u7d4c\u9a13\u306f\u8ab0\u3067\u3082\u3042\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\uff1f\u3053\u308c\u306f\u975e\u5e38\u306b\u5206\u304b\u308a\u3084\u3059\u3044\u66f8\u304d\u65b9\u306a\u306e\u3067\u3088\u304f\u63a1\u7528\u3055\u308c\u307e\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u554f\u984c\u70b9\u3092\u542b\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<h4>\u554f\u984c\u70b9<\/h4>\n<h5>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u60aa\u304f\u306a\u308b\u3002<\/h5>\n<p>\u4e00\u62ec\u3067SQL\u3092\u5b9f\u884c\u3059\u308b\u5834\u5408\u306b\u6bd4\u3079\u3066\u5727\u5012\u7684\u306b\u6027\u80fd\u306f\u60aa\u304f\u306a\u308a\u307e\u3059\u3002\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a2\u30af\u30bb\u30b9\u304c\u5897\u3048\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u4e00\u56de\u3067\u53d6\u5f97\u3059\u308b\u30c7\u30fc\u30bf\u91cf\u3082\u5c11\u91cf\u306b\u306a\u308b\u306e\u3067\u3001I\/O\u8ca0\u8377\u3092\u4e26\u5217\u306b\u51e6\u7406\u3057\u305a\u3089\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>\u30b1\u30fc\u30b9<\/h4>\n<p>\u6570\u767e\u884c\u7a0b\u5ea6\u306e\u30eb\u30fc\u30d7\u3067\u3042\u308c\u3070\u305d\u308c\u307b\u3069\u554f\u984c\u306b\u306a\u308b\u3053\u3068\u306f\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u305f\u3060\u3001\u6570\u767e\u4e07\u56de\u3060\u3063\u305f\u308a\u3001\u6570\u5343\u4e07\u56de\u3060\u3063\u305f\u308a\u306e\u30eb\u30fc\u30d7\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u306f\u3053\u308c\u304c\u9855\u8457\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u30c6\u30fc\u30d6\u30eb\u8a2d\u8a08\u306e\u6307\u91dd \u7279\u5b9a\u306e\u5024\u4ee5\u5916\u5165\u308c\u3066\u6b32\u3057\u304f\u306a\u3044\u30ab\u30e9\u30e0\u306fCHECK\u5236\u7d04\u3092\u4f7f\u3046\u3002 \u4f8b\u3048\u3070\u3001\u524a\u9664\u30d5\u30e9\u30b0\u306a\u3069\u30671\u30012\u306e\u307f\u3057\u304b\u5165\u3063\u3066\u6b32\u3057\u304f\u306a\u3044\u5834\u5408\u306a\u3069\u306f\u4f7f\u3048\u307e\u3059\u3002 \u306a\u304a\u3001MySQL\u3067\u306fCHECK\u5236\u7d04\u306f\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u305b\u3093\u3002\uff088.0. [&hellip;]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[14,23],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13911"}],"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=13911"}],"version-history":[{"count":14,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13911\/revisions"}],"predecessor-version":[{"id":20751,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/13911\/revisions\/20751"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13911"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}