{"id":6090,"date":"2025-09-29T21:58:21","date_gmt":"2025-09-29T12:58:21","guid":{"rendered":"https:\/\/sky-peace.net\/?p=6090"},"modified":"2025-09-29T21:58:21","modified_gmt":"2025-09-29T12:58:21","slug":"sql-pitfall","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/sql-pitfall\/","title":{"rendered":"\u5fdc\u7528\u60c5\u5831\u6280\u8853\u8005\u8a66\u9a13\u306b\u51fa\u308bSQL\u306e\u843d\u3068\u3057\u7a745\u9078\uff1aJOIN\u30fb\u5916\u90e8\u30ad\u30fc\u30fbGROUP BY\u30fb\u30a8\u30a4\u30ea\u30a2\u30b9\u30fb\u8907\u5408\u4e3b\u30ad\u30fc\u306e\u7406\u89e3\u6cd5"},"content":{"rendered":"

SQL\u306e\u57fa\u790e\u306f\u308f\u304b\u3063\u3066\u3044\u308b\u306e\u306b\u3001\u8a66\u9a13\u306e\u8a2d\u554f\u306b\u306a\u308b\u3068\u300c\u3069\u3063\u3061\u304c\u57fa\u70b9\uff1f\u300d\u300c\u3053\u306e\u5217\u306fGROUP BY\u306b\u5165\u308c\u308b\uff1f\u300d\u306a\u3069\u3067\u8ff7\u3046\u2015\u2015\u305d\u3093\u306a\u53d7\u9a13\u8005\u304c\u3064\u307e\u305a\u304d\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3092\u3001\u5b9f\u52d9\u3068\u8a66\u9a13\u306e\u4e21\u9762\u304b\u3089\u6574\u7406\u3057\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001JOIN\u306e\u5de6\u53f3<\/strong>\u3001\u5916\u90e8\u30ad\u30fc\u3067\u8aad\u3080\u591a\u91cd\u5ea6<\/strong>\u3001GROUP BY\u3068SELECT\u306e\u95a2\u4fc2<\/strong>\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u76f4\u611f\u7684\u306a\u628a\u63e1\u3068\u8a18\u6cd5<\/strong>\u3001\u4e3b\u30ad\u30fc\u304c\u591a\u3044\uff08\u8907\u5408\u4e3b\u30ad\u30fc\uff09\u30b1\u30fc\u30b9<\/strong>\u306e5\u30c6\u30fc\u30de\u3092\u3001\u6700\u77ed\u3067\u8151\u306b\u843d\u3061\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\n

1. JOIN\u306eON\u53e5\uff1a\u5de6\u53f3\u306b\u533a\u5225\u306f\u3042\u308b\u306e\u304b\uff1f<\/h2>\n

\u7d50\u8ad6<\/h3>\n
    \n
  • INNER JOIN<\/strong>\uff1aON<\/code>\u306e\u5de6\u53f3\uff08A.id = B.id<\/code> \u3068 B.id = A.id<\/code>\uff09\u306b\u610f\u5473\u306e\u9055\u3044\u306f\u3042\u308a\u307e\u305b\u3093\uff08\u7b49\u53f7\u306f\u5bfe\u79f0\uff09\u3002<\/li>\n
  • OUTER JOIN\uff08LEFT\/RIGHT\/FULL\uff09<\/strong>\uff1aON<\/code>\u306e\u5de6\u53f3\u3067\u306f\u306a\u304f\u3001JOIN\u53e5\u306e\u5de6\u53f3<\/strong>\uff08LEFT\/RIGHT\u3067\u3069\u3061\u3089\u3092\u300c\u5fc5\u305a\u6b8b\u3059\u304b\u300d\uff09\u304c\u7d50\u679c\u3092\u6c7a\u3081\u307e\u3059\u3002<\/li>\n
  • \u975e\u7b49\u53f7\u7d50\u5408\uff08<, >, BETWEEN \u306a\u3069\uff09<\/strong>\uff1a\u5de6\u53f3\u3092\u5165\u308c\u66ff\u3048\u308b\u3068\u610f\u5473\u304c\u5909\u308f\u308b\u306e\u3067\u6ce8\u610f\u3002<\/li>\n<\/ul>\n

    \u57fa\u672c\u4f8b\uff1aINNER JOIN \u306f\u5de6\u53f3\u5165\u308c\u66ff\u3048\u53ef<\/h3>\n
    -- \u540c\u3058\u610f\u5473\nSELECT *\nFROM A\nJOIN B ON A.id = B.id;\n\nSELECT *\nFROM A\nJOIN B ON B.id = A.id;\n<\/code><\/pre>\n
    \u7b49\u53f7\u306e\u6bd4\u8f03\u306f\u5bfe\u79f0\u306a\u306e\u3067\u3001\u7d50\u679c\u306f\u540c\u4e00\u3067\u3059\u3002\u53ef\u8aad\u6027\u306e\u89b3\u70b9\u3067\u306f\u300c\u5de6\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u306f\u5de6\u3001\u53f3\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u306f\u53f3\u300d\u306b\u63c3\u3048\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n
    LEFT\/RIGHT \u3067\u7d50\u679c\u304c\u5909\u308f\u308b\uff08\u57fa\u70b9\u306fJOIN\u306e\u5de6\u53f3\uff09<\/h3>\n
    -- A \u3092\u57fa\u70b9\u306b\u300cA\u306b\u3042\u308b\u304cB\u306b\u306a\u3044\u884c\u300d\u3082\u6b8b\u3059\nSELECT A.id, B.name\nFROM A\nLEFT JOIN B ON A.id = B.id;\n\n-- B \u3092\u57fa\u70b9\u306b\u300cB\u306b\u3042\u308b\u304cA\u306b\u306a\u3044\u884c\u300d\u3082\u6b8b\u3059\nSELECT A.id, B.name\nFROM A\nRIGHT JOIN B ON A.id = B.id;\n<\/code><\/pre>\n
    \u57fa\u70b9\uff08\u5fc5\u305a\u6b8b\u308b\u5074\uff09<\/strong>\u306f LEFT JOIN<\/code> \u306e\u5de6\u3001RIGHT JOIN<\/code> \u306e\u53f3\u3067\u3059\u3002ON<\/code>\u306e\u5de6\u53f3\u3067\u306f\u306a\u304f\u3001JOIN\u306e\u65b9\u5411<\/strong>\u3067\u6c7a\u307e\u308b\u70b9\u3092\u53d6\u308a\u9055\u3048\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n
    \u975e\u7b49\u53f7\u7d50\u5408\u306f\u5de6\u53f3\u3067\u610f\u5473\u304c\u5909\u308f\u308b<\/h3>\n
    -- A.value \u304c B.value \u3088\u308a\u5c0f\u3055\u3044\u884c\u306e\u7d44\u5408\u305b\nSELECT *\nFROM A\nJOIN B ON A.value < B.value;\n\n-- \u2191\u3068\u306f\u610f\u5473\u304c\u9006\nSELECT *\nFROM A\nJOIN B ON B.value < A.value;\n<\/code><\/pre>\n
    \u5927\u5c0f\u6bd4\u8f03\u306f\u5bfe\u79f0\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8a2d\u554f\u3067\u51fa\u3066\u304d\u305f\u5834\u5408\u306f\u300c\u3069\u3061\u3089\u3092\u57fa\u6e96\u306b\u3059\u308b\u306e\u304b\u300d\u3092\u3057\u3063\u304b\u308a\u8aad\u307f\u53d6\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n
    2. \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u9023\u306e\u898b\u5206\u3051\u65b9\uff1a\u5916\u90e8\u30ad\u30fc\u306b\u6ce8\u76ee<\/h2>\n
    \u57fa\u672c\u30eb\u30fc\u30eb<\/h3>\n
      \n
    • \u5916\u90e8\u30ad\u30fc\u3092\u6301\u3064\u5074\u304c\u300c\u591a\uff08N\uff09\u300d<\/strong><\/li>\n
    • \u5916\u90e8\u30ad\u30fc\u304c\u53c2\u7167\u3059\u308b\u4e3b\u30ad\u30fc\u5074\u304c\u300c\u4e00\uff081\uff09\u300d<\/strong><\/li>\n<\/ul>\n
      \u4f8b\u3048\u3070\u300c\u793e\u54e1\u300d\u3068\u300c\u90e8\u7f72\u300d\u306e\u5834\u5408\u3001\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\u304c\u90e8\u7f72ID\u3092\u5916\u90e8\u30ad\u30fc\u3068\u3057\u3066\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u793e\u54e1\u306f\u8907\u6570\u4eba\u304c\u540c\u3058\u90e8\u7f72\u306b\u6240\u5c5e\u3067\u304d\u308b\u306e\u3067\u3001\u95a2\u4fc2\u306f\u300c\u90e8\u7f72 1\uff1a\u793e\u54e1 N\u300d\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
      \u90e8\u7f72\uff08\u90e8\u7f72ID \u4e3b\u30ad\u30fc\uff09\n\u793e\u54e1\uff08\u793e\u54e1ID \u4e3b\u30ad\u30fc, \u90e8\u7f72ID \u5916\u90e8\u30ad\u30fc\uff09\n<\/code><\/pre>\n
      \u3053\u306e\u5834\u5408\u3001\u90e8\u7f72ID\u3092\u6301\u3064\u300c\u793e\u54e1\u300d\u304c\u591a\uff08N\uff09\u3001\u53c2\u7167\u3055\u308c\u308b\u300c\u90e8\u7f72\u300d\u304c\u4e00\uff081\uff09\u3067\u3059\u3002<\/p>\n
      \u4f8b\u5916\u30d1\u30bf\u30fc\u30f3<\/h3>\n
        \n
      • \u8907\u5408\u30ad\u30fc<\/strong>\uff1a\u6ce8\u6587\u8a73\u7d30\u306e\u3088\u3046\u306b\u300c\u6ce8\u6587ID\uff0b\u5546\u54c1ID\u300d\u3067\u4e00\u610f\u306b\u3059\u308b\u5834\u5408\u3001\u305d\u308c\u305e\u308c\u306e\u5916\u90e8\u30ad\u30fc\u3092\u500b\u5225\u306b\u8003\u3048\u308b\u3002<\/li>\n
      • \u81ea\u5df1\u53c2\u7167<\/strong>\uff1a\u793e\u54e1\u8868\u306b\u300c\u4e0a\u53f8ID\u300d\u3092\u6301\u305f\u305b\u308b\u5834\u5408\u3001\u793e\u54e1\uff1a\u793e\u54e1\u30671:N\u306e\u95a2\u4fc2\u304c\u751f\u307e\u308c\u308b\u3002<\/li>\n
      • \u591a\u5bfe\u591a\uff08M:N\uff09<\/strong>\uff1a\u5b66\u751f\u3068\u8b1b\u7fa9\u306e\u95a2\u4fc2\u306f\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\uff08\u53d7\u8b1b\uff09\u3092\u4f5c\u3063\u30661:N\uff0b1:N\u306b\u5206\u89e3\u3059\u308b\u3002<\/li>\n
      • \u6982\u5ff5ER\u56f3<\/strong>\uff1a\u554f\u984c\u6587\u3067\u306f\u5916\u90e8\u30ad\u30fc\u304c\u56f3\u793a\u3055\u308c\u305a\u3001\u6587\u7ae0\u304b\u30891:N\u3092\u8aad\u307f\u53d6\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3082\u3042\u308b\u3002<\/li>\n<\/ul>\n
        \u3057\u305f\u304c\u3063\u3066\u300c\u5916\u90e8\u30ad\u30fc\u3092\u6301\u3063\u3066\u3044\u308b\u65b9\u304c\u591a\u300d\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3067\u307b\u3068\u3093\u3069\u89e3\u3051\u307e\u3059\u304c\u3001\u4f8b\u5916\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3068\u8a66\u9a13\u3067\u8ff7\u3044\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
        \n
        3. GROUP BY\u3067\u6307\u5b9a\u3059\u308b\u5217\u306e\u6c7a\u3081\u65b9<\/h2>\n
        \u57fa\u672c\u30eb\u30fc\u30eb<\/h3>\n
          \n
        • SELECT\u53e5\u306b\u66f8\u3044\u305f\u5217\u306f\u3001\u96c6\u8a08\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3059\u3079\u3066GROUP BY\u306b\u542b\u3081\u308b\u5fc5\u8981\u304c\u3042\u308b<\/strong><\/li>\n
        • \u96c6\u8a08\u95a2\u6570\u3092\u4f7f\u3063\u305f\u5217\uff08COUNT, SUM, MAX\u306a\u3069\uff09\u306fGROUP BY\u306b\u542b\u3081\u308b\u5fc5\u8981\u306a\u3057<\/li>\n<\/ul>\n
          -- \u90e8\u7f72\u3054\u3068\u306e\u793e\u54e1\u6570\nSELECT \u90e8\u7f72ID, COUNT(*)\nFROM \u793e\u54e1\nGROUP BY \u90e8\u7f72ID;   -- \u90e8\u7f72ID\u306f\u975e\u96c6\u8a08\u5217\u306a\u306e\u3067GROUP BY\u5fc5\u9808\n<\/code><\/pre>\n
          GROUP BY\u306e\u7c92\u5ea6\u306b\u3088\u308b\u9055\u3044<\/h3>\n
          -- \u90e8\u7f72\u3054\u3068\nSELECT \u90e8\u7f72ID, COUNT(*)\nFROM \u793e\u54e1\nGROUP BY \u90e8\u7f72ID;\n\n-- \u90e8\u7f72 \u00d7 \u5f79\u8077\u3054\u3068\nSELECT \u90e8\u7f72ID, \u5f79\u8077, COUNT(*)\nFROM \u793e\u54e1\nGROUP BY \u90e8\u7f72ID, \u5f79\u8077;\n\n-- \u90e8\u7f72 \u00d7 \u5f79\u8077 \u00d7 \u793e\u54e1\u3054\u3068\uff08\u610f\u5473\u304c\u8584\u3044\uff09\nSELECT \u90e8\u7f72ID, \u5f79\u8077, \u793e\u54e1ID, COUNT(*)\nFROM \u793e\u54e1\nGROUP BY \u90e8\u7f72ID, \u5f79\u8077, \u793e\u54e1ID;\n<\/code><\/pre>\n
          \u3059\u3079\u3066\u306e\u5217\u3092GROUP BY\u306b\u5165\u308c\u308b\u3068\u300c\u884c\u5358\u4f4d\u300d\u3067\u3057\u304b\u307e\u3068\u307e\u3089\u306a\u3044\u306e\u3067\u3001COUNT(*)<\/code>\u306f\u5fc5\u305a1\u306b\u306a\u308a\u3001\u96c6\u8a08\u306e\u610f\u5473\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
          DISTINCT\u3068\u306e\u95a2\u4fc2<\/h3>\n
          \u5b9f\u306f\u300c\u5168\u5217\u3092GROUP BY\u3059\u308b\u300d\u3068\u300cDISTINCT\u300d\u3068\u540c\u3058\u52b9\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
          -- \u793e\u54e1\u306e\u90e8\u7f72ID\u3068\u5f79\u8077\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u4e00\u610f\u306b\u53d6\u308a\u305f\u3044\u5834\u5408\nSELECT DISTINCT \u90e8\u7f72ID, \u5f79\u8077 FROM \u793e\u54e1;\n\n-- GROUP BY\u3067\u3082\u540c\u3058\nSELECT \u90e8\u7f72ID, \u5f79\u8077 FROM \u793e\u54e1 GROUP BY \u90e8\u7f72ID, \u5f79\u8077;\n<\/code><\/pre>\n
          \u3064\u307e\u308a\u3001GROUP BY\u306f\u96c6\u8a08<\/strong>\u306b\u3082\u91cd\u8907\u6392\u9664<\/strong>\u306b\u3082\u4f7f\u3048\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n
          4. \u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u76f4\u611f\u7684\u306b\u628a\u63e1\u3059\u308b\u65b9\u6cd5\u3068\u8a18\u8f09\u30eb\u30fc\u30eb<\/h2>\n
          \u30a8\u30a4\u30ea\u30a2\u30b9\u3068\u306f\uff1f<\/h3>\n
          \u30c6\u30fc\u30d6\u30eb\u3084\u5217\u306b\u4e00\u6642\u7684\u306a\u5225\u540d\u3092\u4ed8\u3051\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002SQL\u306e\u554f\u984c\u6587\u3067\u306f\u3044\u304d\u306a\u308a R.\u5217\u540d<\/code> \u3084 J.\u5217\u540d<\/code> \u306e\u3088\u3046\u306b\u767b\u5834\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u308c\u306fFROM\u53e5\u3084JOIN\u53e5\u3067\u8a2d\u5b9a\u3055\u308c\u305f\u30a8\u30a4\u30ea\u30a2\u30b9<\/strong>\u3092\u6307\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
          \u8a18\u8f09\u30eb\u30fc\u30eb<\/h3>\n
            \n
          • \u30c6\u30fc\u30d6\u30eb\u306b\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u308b<\/strong>\uff1a\u30c6\u30fc\u30d6\u30eb\u540d \u30a8\u30a4\u30ea\u30a2\u30b9<\/code> \uff08AS<\/code>\u306f\u7701\u7565\u53ef\uff09
            \n    \u4f8b\uff1aFROM \u793e\u54e1 E<\/code> \uff08\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\u3092 E \u3068\u3057\u3066\u53c2\u7167\uff09<\/li>\n
          • \u30b5\u30d6\u30af\u30a8\u30ea\u306b\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u308b<\/strong>\uff1a\u5fc5\u9808\u3002
            \n    \u4f8b\uff1aFROM (SELECT ... FROM \u793e\u54e1) S<\/code><\/li>\n
          • \u5217\u3084\u5f0f\u306b\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u308b<\/strong>\uff1a\u5217\u540d\/\u5f0f AS \u5225\u540d<\/code>\uff08AS\u7701\u7565\u53ef\uff09
            \n    \u4f8b\uff1aSELECT COUNT(*) AS \u4ef6\u6570<\/code><\/li>\n
          • \u53c2\u7167\u6642<\/strong>\uff1a\u5fc5\u305a \u30a8\u30a4\u30ea\u30a2\u30b9.\u5217\u540d<\/code> \u306e\u9806\u3067\u66f8\u304f
            \n    \u4f8b\uff1aSELECT E.\u793e\u54e1\u540d FROM \u793e\u54e1 E<\/code><\/li>\n<\/ul>\n
            \u76f4\u611f\u7684\u306b\u628a\u63e1\u3059\u308b\u30b3\u30c4<\/h3>\n
              \n
            1. FROM\u53e5\u3084JOIN\u53e5\u306e\u76f4\u5f8c<\/strong>\u3092\u63a2\u305b\u3070\u300c\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u4ed8\u3044\u3066\u3044\u308b\u304b\u300d\u304c\u5206\u304b\u308b<\/li>\n
            2. \u5217\u3092\u53c2\u7167\u3057\u3066\u3044\u308b\u7b87\u6240\u3067\u300cR.\u5217\u540d\u300d\u3068\u3042\u308c\u3070\u3001\u307e\u305aFROM\u53e5\u306b\u300c… R\u300d\u304c\u306a\u3044\u304b\u63a2\u3059<\/li>\n
            3. \u30c6\u30fc\u30d6\u30eb\u540d\u304c\u9577\u3044\u5834\u5408\u3084\u8907\u6570JOIN\u3059\u308b\u5834\u5408\u306b\u3001\u77ed\u7e2e\u5f62\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u3067\u4ed8\u3051\u3089\u308c\u308b\u3053\u3068\u304c\u591a\u3044<\/li>\n<\/ol>\n
              \n
              5. \u4e3b\u30ad\u30fc\u304c\u591a\u3044\u5834\u5408\u306b\u3064\u3044\u3066<\/h2>\n
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              \u5178\u578b\u4f8b<\/h3>\n
                \n
              • \u6ce8\u6587\u8a73\u7d30<\/strong>\uff1a\u6ce8\u6587ID + \u5546\u54c1ID<\/code> \u304c\u4e3b\u30ad\u30fc\u3002\u3069\u3061\u3089\u304b1\u3064\u3060\u3051\u3067\u306f\u4e00\u610f\u306b\u306a\u3089\u306a\u3044\u3002<\/li>\n
              • \u6708\u6b21\u96c6\u8a08\u8868<\/strong>\uff1a\u5e74\u6708 + \u99d0\u8eca\u5834ID + \u8eca\u7a2eID + \u4f1a\u54e1ID<\/code> \u304c\u4e3b\u30ad\u30fc\u30021\u884c\u304c\u300c\u7279\u5b9a\u306e\u6708\u30fb\u99d0\u8eca\u5834\u30fb\u8eca\u7a2e\u30fb\u4f1a\u54e1\u300d\u3092\u8868\u3059\u305f\u3081\u3002<\/li>\n<\/ul>\n
                \u5b9f\u52d9\u3068\u8a66\u9a13\u306e\u9055\u3044<\/h3>\n
                  \n
                • \u5b9f\u52d9\u3067\u306f\u5217\u6570\u304c\u591a\u3044\u8907\u5408\u30ad\u30fc\u306f\u6271\u3044\u306b\u304f\u3044\u305f\u3081\u3001\u4ee3\u7406\u30ad\u30fc\uff08\u30b5\u30ed\u30b2\u30fc\u30c8\u30ad\u30fc\uff09<\/strong>\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3082\u591a\u3044<\/li>\n
                • \u8a66\u9a13\u3067\u306f\u300c\u305d\u306e\u30c6\u30fc\u30d6\u30eb\u306e1\u884c\u304c\u3069\u306e\u7c92\u5ea6\u3092\u8868\u3057\u3066\u3044\u308b\u304b\u300d\u3092\u57fa\u6e96\u306b\u3001\u5fc5\u8981\u306a\u5217\u3092\u3059\u3079\u3066\u7d44\u307f\u5408\u308f\u305b\u308c\u3070OK<\/li>\n<\/ul>\n
                  \u899a\u3048\u65b9<\/h3>\n
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                  SQL\u306e\u57fa\u790e\u306f\u308f\u304b\u3063\u3066\u3044\u308b\u306e\u306b\u3001\u8a66\u9a13\u306e\u8a2d\u554f\u306b\u306a\u308b\u3068\u300c\u3069\u3063\u3061\u304c\u57fa\u70b9\uff1f\u300d\u300c\u3053\u306e\u5217\u306fGROUP BY\u306b\u5165\u308c\u308b\uff1f\u300d\u306a\u3069\u3067\u8ff7\u3046\u2015\u2015\u305d\u3093\u306a\u53d7\u9a13\u8005\u304c\u3064\u307e\u305a\u304d\u3084\u3059\u3044\u30dd\u30a4\u30f3\u30c8\u3092\u3001\u5b9f\u52d9\u3068\u8a66\u9a13\u306e\u4e21\u9762\u304b\u3089\u6574\u7406\u3057\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067 … <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","columnck":"","stmeta_robots":"index, follow","st_titlewords":"","st_title_extra":"","st_keywords":"","st_description":"","st_display_ad_mark":"","st_display_ad_mark_hide":"","textcopyck":"","st_copyright":"","st_copyurl":"","eyecatch_set":"","st_youtube_url":"","st_youtube_eyecatch":"","headerwidget_set":"","updatewidget_set":"","kanrenwidget_set":"","ikkatuwidget_set":"","koukoku_set":"","auto_adsense_koukoku_set":"","st_redirect":"","st_redirect_url_as_canonical":"","st_redirect_pvm_do_not_track":"","post_data_updatewidget_set":"","st_post_header_under_bg":"","st_twitter_tag":"","affinger_note":"","rankdisplayck":"","st_head_code":"","st_footer_code":"","st_post_header_under_code":"","_st_toc_override":false,"_st_toc_settings":[]},"categories":[3],"tags":[6],"class_list":["post-6090","post","type-post","status-publish","format-standard","hentry","category-ipa","tag-6"],"_links":{"self":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts\/6090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/comments?post=6090"}],"version-history":[{"count":0,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts\/6090\/revisions"}],"wp:attachment":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/media?parent=6090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/categories?post=6090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/tags?post=6090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}