{"id":3238,"date":"2024-06-11T05:00:00","date_gmt":"2024-06-10T20:00:00","guid":{"rendered":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/?p=3238"},"modified":"2024-09-27T17:18:13","modified_gmt":"2024-09-27T08:18:13","slug":"053","status":"publish","type":"post","link":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/blog\/articles\/sql\/053\/","title":{"rendered":"\u3010SQL\u3011JOIN\u3068UNION\u306e\u9055\u3044\u3068\u306f\uff1f\u30b5\u30f3\u30d7\u30eb\u3092\u7528\u3044\u306a\u304c\u3089\u89e3\u8aac\uff01"},"content":{"rendered":"\n
\n

\u3053\u306e\u8a18\u4e8b\u304c\u89e3\u6c7a\u3067\u304d\u308b\u3053\u3068<\/strong><\/p>\n\n\n\n

    \n
  1. JOIN\u3068UNION\u306e\u9055\u3044\u304c\u308f\u304b\u308b<\/strong><\/li>\n\n\n\n
  2. SQL\u3092\u66f8\u304f\u3068\u304d\u306b\u6c17\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c<\/strong><\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n

    \u306f\u3058\u3081\u306b<\/h2>\n\n\n\n

    \u300cRDB\uff08\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\uff09<\/strong>\u300d\u3092\u904b\u7528\u30fb\u69cb\u7bc9\u3059\u308b\u4e0a\u3067\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a00\u8a9e\u3067\u3042\u308b\u300cSQL\uff08Structured Query Language\uff09<\/strong>\u300d\u306e\u7fd2\u5f97\u306f\u6b20\u304b\u305b\u307e\u305b\u3093\u3002SQL\u3092\u5b66\u7fd2\u3059\u308b\u4e0a\u3067\u4f3c\u305f\u3088\u3046\u306a\u5f79\u5272\u3092\u6301\u3064\u30af\u30a8\u30ea\u304c\u3044\u304f\u3064\u304b\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

    \u300cJOIN<\/strong>\u300d\u3068\u300cUNION<\/strong>\u300d\u3082\u305d\u306e\u3072\u3068\u3064\u3067\u3059\u3002<\/p>\n\n\n\n

    \u672c\u8a18\u4e8b\u3067\u306f\u3001JOIN\u3068UNION\u306e\u9055\u3044\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u7528\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u6700\u5f8c\u307e\u3067\u8aad\u3093\u3067\u3044\u305f\u3060\u304f\u3068\u3001SQL\u306b\u304a\u3051\u308bJOIN\u3068UNION\u306b\u3064\u3044\u3066\u7406\u89e3\u3092\u6df1\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

    \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5f79\u5272\u306b\u3064\u3044\u3066\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u3053\u3061\u3089\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n

    \n\n
    \u30c7\u30fc\u30bf\u30de\u30fc\u30c8\uff08DM\uff09\u3068\u306f\uff1f\u7a2e\u985e\u3084\u30e1\u30ea\u30c3\u30c8\u306a\u3069\u3092\u89e3\u8aac\uff01!<\/figure>\n
    \n
    SQL <\/div>\n
    \u30c7\u30fc\u30bf\u30de\u30fc\u30c8\uff08DM\uff09\u3068\u306f\uff1f\u7a2e\u985e\u3084\u30e1\u30ea\u30c3\u30c8\u306a\u3069\u3092\u89e3\u8aac\uff01! <\/div>\n<\/div><\/a><\/div>\n<\/div><\/div>\n\n\n\n

    <\/p>\n\n\n\n

    JOIN\u3068\u306f<\/h2>\n\n\n\n

    RDB\u3067\u306f\u3001\u8907\u6570\u306e\u300c\u884c\uff08\u30ec\u30b3\u30fc\u30c9\uff09<\/strong>\u300d\u3068\u300c\u5217\uff08\u30ab\u30e9\u30e0\uff09<\/strong>\u300d\u3067\u69cb\u6210\u3055\u308c\u305f\u300c\u30c6\u30fc\u30d6\u30eb<\/strong>\u300d\u3068\u547c\u3070\u308c\u308b\u8868\u3067\u30c7\u30fc\u30bf\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

    JOIN\u306f\u3001\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u95a2\u9023\u3065\u3051\u308b<\/strong>\u30af\u30a8\u30ea\u3067\u3059\u3002\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u7279\u5b9a\u306e\u884c\u3092\u62bd\u51fa\u3059\u308b\u300cSELECT<\/strong>\u300d\u3068\u547c\u3070\u308c\u308b\u69cb\u6587\u3067\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n

    \n
    \"\"\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n

    JOIN\u306f\u3001\u4ee5\u4e0b\u306e3\u7a2e\u985e\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

    \n
    \n

    JOIN\u306e\u7a2e\u985e<\/strong><\/p>\n\n\n\n

      \n
    1. INNER JOIN<\/li>\n\n\n\n
    2. LEFT JOIN<\/li>\n\n\n\n
    3. FULL OUTER JOIN<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n

      \u4eca\u56de\u306f\u3001\u4ee5\u4e0b\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u5229\u7528\u3057\u3066\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

      employee_id<\/th>employee_name<\/th><\/tr><\/thead>
      1<\/td>John Doe<\/td><\/tr>
      2<\/td>Jane Smith<\/td><\/tr>
      3<\/td>Alice Johnson<\/td><\/tr>
      4<\/td>Bob Brown<\/td><\/tr><\/tbody><\/table>
      employees<\/figcaption><\/figure>\n\n\n\n
      employee_id<\/th>department_name<\/th><\/tr><\/thead>
      1<\/td>Sales<\/td><\/tr>
      2<\/td>Marketing<\/td><\/tr>
      3<\/td>HR<\/td><\/tr>
      5<\/td>IT<\/td><\/tr><\/tbody><\/table>
      departments <\/figcaption><\/figure>\n\n\n\n

      INNER JOIN<\/mark><\/h3>\n\n\n\n

      \u300cINNER JOIN\u300d\u306f\u3001\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5171\u901a\u3059\u308b\u884c\u306e\u307f\u3092\u53d6\u5f97\u3059\u308b<\/strong>\u65b9\u6cd5\u3067\u3059\u3002\u5171\u901a\u3059\u308b\u884c\u304c\u306a\u3044\u5834\u5408\u3001\u305d\u306e\u884c\u306f\u7d50\u679c\u306b\u542b\u307e\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n

      \n
      \"\"\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n

      \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n

      \nSELECT\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.id AS employee_id,\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.name AS employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0departments.name AS department_name\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees\nINNER JOIN\n\u00a0\u00a0\u00a0\u00a0departments\u00a0\nON\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_id = employee_id;\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_id<\/th>employee_name<\/th>department_name<\/th><\/tr><\/thead>
      1<\/td>John Doe<\/td>Sales<\/td><\/tr>
      2<\/td>Jane Smith<\/td>Marketing<\/td><\/tr>
      3<\/td>lice Johnson<\/td>HR<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      LEFT JOIN<\/mark><\/h3>\n\n\n\n
      \u300cLEFT JOIN\u300d\u306f\u3001\u30c6\u30fc\u30d6\u30ebA\u306e\u3059\u3079\u3066\u306e\u884c\u3092\u53d6\u5f97\u3057\u3001\u30c6\u30fc\u30d6\u30ebB\u306b\u4e00\u81f4\u3059\u308b\u884c\u304c\u3042\u308c\u3070\u305d\u308c\u3082\u4e00\u7dd2\u306b\u53d6\u5f97\u3059\u308b<\/strong>\u65b9\u6cd5\u3067\u3059\u3002\u30c6\u30fc\u30d6\u30ebB\u306b\u4e00\u81f4\u3059\u308b\u884c\u304c\u306a\u3044\u5834\u5408\u306f\u3001\u305d\u306e\u90e8\u5206\u306bNULL\u304c\u5165\u308a\u307e\u3059\u3002<\/p>\n\n\n
      \n
      \"\"\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n
      \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n
      \nSELECT\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_id AS employee_id,\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_name AS employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0departments.department_name AS department_name\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees\nLEFT JOIN\u00a0\n\u00a0\u00a0\u00a0\u00a0departments\u00a0\nON\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_id = departments.employee_id;\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_id<\/th>employee_name<\/th>department_name<\/th><\/tr><\/thead>
      1<\/td>John Doe<\/td>Sales<\/td><\/tr>
      2<\/td>Jane Smith<\/td>Marketing<\/td><\/tr>
      3<\/td>Alice Johnson<\/td>HR<\/td><\/tr>
      4<\/td>Bob Brown<\/td>NULL<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      FULL OUTER JOIN<\/mark><\/h3>\n\n\n\n
      \u300cFULL OUTER JOIN\u300d\u306f\u3001\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3059\u3079\u3066\u306e\u884c\u3092\u53d6\u5f97\u3057\u3001\u5171\u901a\u3059\u308b\u884c\u304c\u3042\u308c\u3070\u305d\u308c\u3092\u7d50\u5408\u3057\u3001\u5171\u901a\u3057\u306a\u3044\u884c\u306b\u306fNULL\u3092\u5165\u308c\u308b<\/strong>\u65b9\u6cd5\u3067\u3059\u3002\u30c6\u30fc\u30d6\u30ebA\u307e\u305f\u306f\u30c6\u30fc\u30d6\u30ebB\u306e\u3069\u3061\u3089\u304b\u4e00\u65b9\u306b\u3057\u304b\u5b58\u5728\u3057\u306a\u3044\u884c\u3082\u7d50\u679c\u306b\u542b\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n
      \n
      \"\"\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n\n\n
      \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n
      \nSELECT\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_id AS employee_id_1,\u00a0 --employees\u304b\u3089\u53c2\u7167\n\u00a0\u00a0\u00a0\u00a0employees.employee_name AS employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0departments.employee_id AS employee_id_2, \u00a0 --departments\u304b\u3089\u53c2\u7167\u00a0\n\u00a0\u00a0\u00a0\u00a0departments.department_name AS department_name\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees\nFULL OUTER JOIN\u00a0\n\u00a0\u00a0\u00a0\u00a0departments\u00a0\nON\u00a0\n\u00a0\u00a0\u00a0\u00a0employees.employee_id = departments.employee_id;\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_id_1<\/th>employee_name<\/th>employee_id_2<\/th>department_name<\/th><\/tr><\/thead>
      1<\/td>John Doe<\/td>1<\/td>Sales<\/td><\/tr>
      2<\/td>Jane Smith<\/td>2<\/td>Marketing<\/td><\/tr>
      3<\/td>Alice Johnson<\/td>3<\/td>HR<\/td><\/tr>
      4<\/td>Bob Brown<\/td>NULL<\/td>NULL<\/td><\/tr>
      NULL<\/td>NULL<\/td>5<\/td>IT<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      UNION\u3068\u306f<\/h2>\n\n\n\n
      UNION\u306f\u3001SELECT\u306e\u7d50\u679c\u3092\u7d50\u5408\u3055\u305b\u308b<\/strong>\u30af\u30a8\u30ea\u3067\u3059\u3002JOIN\u304c\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u6a2a\u306b\u3064\u306a\u3052\u308b\u306e\u306a\u3089\u3001UNION\u306f\u7e26\u306b\u3064\u306a\u3052\u308b\u3068\u601d\u3063\u3066\u3082\u3089\u3048\u308c\u3070\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n\n\n
      \n
      \"\"<\/figure>\n<\/div>\n\n\n
      \u4eca\u56de\u306f\u3001\u4ee5\u4e0b\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u5229\u7528\u3057\u3066\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_name<\/th>email<\/th><\/tr><\/thead>
      John Doe<\/td>john.doe@example.com<\/td><\/tr>
      Jane Smith<\/td>jane.smith@example.com<\/td><\/tr><\/tbody><\/table>
      employees_a<\/figcaption><\/figure>\n\n\n\n
      employee_name<\/th>email<\/th><\/tr><\/thead>
      John Doe<\/td>john.doe@example.com<\/td><\/tr>
      Alice Johnson<\/td>alice.johnson@example.com<\/td><\/tr>
      Bob Brown<\/td>bob.brown@example.com<\/td><\/tr><\/tbody><\/table>
      employees_b <\/figcaption><\/figure>\n\n\n\n
      UNION\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u304c\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u4eca\u56de\u3054\u7d39\u4ecb\u3059\u308b\u306e\u306f\u983b\u5ea6\u306e\u9ad8\u3044\u3082\u306e\u306b\u7d5e\u3063\u3066
      \u30fbUNION DISTINCT
      \u30fbUNION ALL
      \u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
      UNION DISTINCT\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n
      \nSELECT\u00a0\n    employee_name,\u00a0\u00a0\n\u00a0\u00a0\u00a0\u00a0email\u00a0\nFROM\u00a0\n\u00a0\u00a0\u00a0employees_a\n\nUNION DISTINCT\n\nSELECT\u00a0\n    employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0email\u00a0\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees_a;\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_name<\/th>email<\/th><\/tr><\/thead>
      John Doe<\/td>john.doe@example.com<\/td><\/tr>
      Jane Smith<\/td>jane.smith@example.com<\/td><\/tr>
      Alice Johnson<\/td>alice.johnson@example.com<\/td><\/tr>
      Bob Brown<\/td>bob.brown@example.com<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u300cUNION DISTINCT\u300d\u3067\u306f\u3001\u91cd\u8907\u3057\u305f\u884c\u3092\u524a\u9664\u3057\u3066\u7d50\u5408\u3057\u307e\u3059\u304c\u3001\u300cUNION ALL<\/strong>\u300d\u3067\u306f\u3001\u91cd\u8907\u3057\u3066\u3044\u308b\u884c\u3082\u542b\u3081\u3066\u7d50\u5408\u3057\u307e\u3059<\/strong>\u3002<\/p>\n\n\n\n
      UNION ALL\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n
      \nSELECT\u00a0\n\u00a0\u00a0\u00a0\u00a0employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0email\u00a0\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees_a\n\nUNION ALL\n\nSELECT\u00a0\n\u00a0\u00a0\u00a0\u00a0employee_name,\u00a0\n\u00a0\u00a0\u00a0\u00a0email\u00a0\nFROM\u00a0\n\u00a0\u00a0\u00a0\u00a0employees_b;\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
      employee_name<\/th>email<\/th><\/tr><\/thead>
      John Doe<\/td>john.doe@example.com<\/td><\/tr>
      Jane Smith<\/td>jane.smith@example.com<\/td><\/tr>
      John Doe<\/td>john.doe@example.com<\/td><\/tr>
      Alice Johnson<\/td>alice.johnson@example.com<\/td><\/tr>
      Bob Brown<\/td>bob.brown@example.com<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      JOIN\u3068UNION\u306f\u7d44\u307f\u5408\u308f\u305b\u3066\u5229\u7528\u3067\u304d\u308b<\/h2>\n\n\n\n
      JOIN\u306f\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u95a2\u9023\u3059\u308b\u30c7\u30fc\u30bf\u3092\u7d50\u5408\u3057\u30661\u3064\u306e\u7d50\u679c\u30bb\u30c3\u30c8\u306b\u3059\u308b\u306e\u306b\u9069\u3057\u3066\u304a\u308a\u3001UNION\u306f\u8907\u6570\u306eSELECT\u30af\u30a8\u30ea\u306e\u7d50\u679c\u30921\u3064\u306e\u7d50\u679c\u30bb\u30c3\u30c8\u306b\u3059\u308b\u306e\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u5f79\u5272\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u540c\u6642\u306b\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059<\/strong>\u3002<\/p>\n\n\n\n
      JOIN\u3068UNION\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n
      \nSELECT\n    employees.employee_id,\n    employees.employee_name,\n    _union_t.email\nFROM\n    employees\nLEFT JOIN\n (\n  SELECT *\n  FROM\n      employees_a\n\n   UNION DISTINCT\n\n   SELECT *\n   FROM\n       employees_b\n ) AS _union_t\n ON\n    employees.employee_name = _union_t.employee_name\n<\/pre><\/div>\n\n\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306e\u8a73\u7d30\u306a\u51e6\u7406\u5185\u5bb9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
      \n
      \u30b3\u30fc\u30c9\u306e\u8a73\u7d30<\/strong><\/p>\n\n\n\n
        \n
      1. \u201demployees_a\u201d\u3068\u201demployees\uff42\u201d\u3092UNION DISTINCT<\/li>\n\n\n\n
      2. \u201demployees\u201d\u306b\u5bfe\u3057\u3066\u4e0a\u8a18\u30c6\u30fc\u30d6\u30eb\u306eemail\u3092\u4ed8\u4e0e<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n
        \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
        customer_id<\/th>employee_name<\/strong><\/th>email<\/th><\/tr><\/thead>
        1<\/td>John Doe<\/td>john.doe@example.com<\/td><\/tr>
        2<\/td>Jane Smith<\/td>jane.smith@example.com<\/td><\/tr>
        3<\/td>Alice Johnson<\/td>alice.johnson@example.com<\/td><\/tr>
        4<\/td>Bob Brown<\/td>bob.brown@example.com<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        SQL\u3092\u66f8\u304f\u3068\u304d\u306b\u6ce8\u610f\u3059\u308b\u3053\u3068<\/h2>\n\n\n\n
        SQL\u306e\u57fa\u790e\u77e5\u8b58\u3092\u8eab\u306b\u3064\u3051\u305f\u3089\u3001\u5b9f\u969b\u306b\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002SQL\u3092\u66f8\u304f\u3068\u304d\u306f\u3001\u4ee5\u4e0b\u306e3\u70b9\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
        \n
        SQL\u3092\u66f8\u304f\u3068\u304d\u306e\u6ce8\u610f\u70b9<\/strong><\/p>\n\n\n\n
          \n
        1. \u610f\u5473\u3092\u7406\u89e3\u3059\u308b<\/li>\n\n\n\n
        2. \u30c6\u30b9\u30c8\u3059\u308b<\/li>\n\n\n\n
        3. \u30b3\u30e1\u30f3\u30c8\u3092\u6b8b\u3059<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n
          \u610f\u5473\u3092\u7406\u89e3\u3059\u308b<\/mark><\/h3>\n\n\n\n
          SQL\u3092\u66f8\u304f\u3068\u304d\u306f\u3001\u30af\u30a8\u30ea\u3084\u69cb\u6587\u306e\u610f\u5473\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
          \u30af\u30a8\u30ea\u306b\u3088\u3063\u3066\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3057\u305f\u308a\u3001\u5927\u304d\u3044\u8ca0\u8377\u3092\u639b\u3051\u305f\u308a\u3059\u308b\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u7406\u89e3\u304c\u4e0d\u5341\u5206\u306a\u72b6\u614b\u3067\u5371\u967a\u306a\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u5927\u304d\u306a\u640d\u5931\u3092\u88ab\u308a\u307e\u3059<\/strong>\u3002<\/p>\n\n\n\n
          \u30af\u30a8\u30ea\u3084\u69cb\u6587\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u5b9f\u884c\u3059\u308b\u524d\u306b\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
          \u30c6\u30b9\u30c8\u3059\u308b<\/h3>\n\n\n\n
          SQL\u3092\u4f7f\u3063\u3066RDB\u3092\u69cb\u7bc9\u30fb\u5909\u66f4\u3057\u305f\u5834\u5408\u306f\u3001\u30ea\u30ea\u30fc\u30b9\u3059\u308b\u524d\u306b\u30c6\u30b9\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
          \u554f\u984c\u306a\u304f\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u304d\u3066\u3044\u308b\u3068\u611f\u3058\u3066\u3044\u3066\u3082\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7406\u7531\u3067\u3046\u307e\u304f\u5b9f\u884c\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
          \n
          \u5b9f\u884c\u304c\u3046\u307e\u304f\u3044\u304b\u306a\u3044\u8981\u56e0<\/strong><\/p>\n\n\n\n
            \n
          1. \u30b9\u30da\u30eb\u30df\u30b9<\/li>\n\n\n\n
          2. \u4e0d\u8981\u306a\u30d6\u30e9\u30f3\u30af\u304c\u3042\u308b<\/li>\n\n\n\n
          3. RDB\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u53e4\u3044<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n
            \u30c6\u30b9\u30c8\u3092\u901a\u3058\u3066\u30b3\u30fc\u30c9\u306e\u4e0d\u5099\u3092\u89e3\u6d88\u3057\u307e\u3057\u3087\u3046<\/strong>\u3002<\/p>\n\n\n\n
            \u30b3\u30e1\u30f3\u30c8\u3092\u6b8b\u3059<\/mark><\/h3>\n\n\n\n
            SQL\u3067\u306f\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306b\u3042\u308b\u7279\u5b9a\u306e\u7b87\u6240\u3092\u30b3\u30e1\u30f3\u30c8\u3057\u3001\u5b9f\u884c\u306e\u969b\u306b\u9664\u5916\u3059\u308b\u300c\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8<\/strong>\u300d\u3068\u3044\u3046\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002SQL\u3067RDB\u3092\u69cb\u7bc9\u30fb\u5909\u66f4\u3059\u308b\u5834\u5408\u306f\u3001\u30b3\u30e1\u30f3\u30c8\u3092\u6b8b\u3057\u3066\u304a\u304f\u3068\u3001\u30b3\u30fc\u30c9\u306e\u7ba1\u7406\u3084\u30a8\u30e9\u30fc\u306e\u7279\u5b9a\u304c\u52b9\u7387\u7684\u306b\u306a\u308a\u307e\u3059<\/strong>\u3002<\/p>\n\n\n\n
            \u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n
            \n-- \u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u5165\n\n\/*\u00a0\n\u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u5165\n*\/\n\n\/*\n\u30b3\u30e1\u30f3\u30c8\u3092\u8a18\u5165\n\u30b3\u30e1\u30f3\u30c8\u30a2\u30a6\u30c8\n*\/\n<\/pre><\/div>\n\n\n
            \u30c7\u30fc\u30bf\u5229\u6d3b\u7528\u306b\u304a\u60a9\u307f\u306e\u65b9\u306b\u306fDX-Accelerator\u304c\u304a\u3059\u3059\u3081<\/h2>\n\n\n\n
            \u4eca\u56de\u306f\u3001JOIN\u3068UNION\u306e\u9055\u3044\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
            JOIN\u3084UNION\u306a\u3069\u306e\u30af\u30a8\u30ea\u3092\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u3067\u3001RDB\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u7c21\u5358\u306b\u7ba1\u7406\u30fb\u64cd\u4f5c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6b63\u3057\u3044\u77e5\u8b58\u3092\u8eab\u306b\u3064\u3051\u3001\u81ea\u793e\u306e\u30cb\u30fc\u30ba\u306b\u30de\u30c3\u30c1\u3057\u305fRDB\u3092\u904b\u7528\u30fb\u69cb\u7bc9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n
            \u307e\u305f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u7528\u3044\u305f\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u30fb\u52a0\u5de5\u30fb\u524d\u51e6\u7406\u306a\u3069\u3067\u304a\u56f0\u308a\u306e\u65b9\u306b\u306f\u3001\u30c7\u30fc\u30bf\u4eba\u6750\u5e38\u99d0\u652f\u63f4\u30b5\u30fc\u30d3\u30b9<\/strong>\u300cDX-Accelerator<\/strong>\u300d\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n\n\n\n
            \u30c7\u30fc\u30bf\u4eba\u6750\u5e38\u99d0\u652f\u63f4\u30b5\u30fc\u30d3\u30b9\u300cDX-Accelerator\u300d\u3067\u306f\u3001\u30c7\u30fc\u30bf\u306e\u53ce\u96c6\u304b\u3089\u5206\u6790\u30fb\u53ef\u8996\u5316\u306b\u81f3\u308b\u307e\u3067\u30c7\u30fc\u30bf\u6d3b\u7528\u95a2\u9023\u306e\u304a\u60a9\u307f\u3092\u72ec\u81ea\u306e\u6559\u80b2\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0\u3092\u5c65\u4fee\u3057\u305f\u30a2\u30ca\u30ea\u30c6\u30a3\u30af\u30b9\u30a8\u30f3\u30b8\u30cb\u30a2\u304c\u89e3\u6c7a\u3057\u3066\u3044\u307e\u3059\u3002\u8208\u5473\u304c\u3042\u308b\u65b9\u306f\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
             
            \n\n
            \u30c7\u30fc\u30bf\u6d3b\u7528\u306e\u4ed5\u7d44\u5316\u3092\u652f\u63f4\uff01DX-Accelerator\uff08DXA\uff09\u3068\u306f\uff1f<\/figure>\n
            \n
            \u30df\u30c3\u30b7\u30e7\u30f3 <\/div>\n
            \u30c7\u30fc\u30bf\u6d3b\u7528\u306e\u4ed5\u7d44\u5316\u3092\u652f\u63f4\uff01DX-Accelerator\uff08DXA\uff09\u3068\u306f\uff1f <\/div>\n<\/div><\/a><\/div>\n<\/div><\/div>\n\n\n\n
            <\/p>\n\n\n\n
            \u81ea\u793e\u304c\u4fdd\u6709\u3057\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u826f\u304f\u5229\u6d3b\u7528\u3057\u3001\u7af6\u5408\u4ed6\u793e\u306b\u8ca0\u3051\u306a\u3044\u4f01\u696d\u3092\u76ee\u6307\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u3053\u306e\u8a18\u4e8b\u304c\u89e3\u6c7a\u3067\u304d\u308b\u3053\u3068 \u306f\u3058\u3081\u306b \u300cRDB\uff08\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\uff09\u300d\u3092\u904b\u7528\u30fb\u69cb\u7bc9\u3059\u308b\u4e0a\u3067\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a00\u8a9e\u3067\u3042\u308b\u300cSQL\uff08Structured Query Language\uff09\u300d\u306e\u7fd2\u5f97\u306f\u6b20\u304b\u305b\u307e\u305b\u3093\u3002SQL\u3092\u5b66\u7fd2\u3059 […]<\/p>\n","protected":false},"author":8,"featured_media":3253,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[43],"tags":[],"blog_category":[79],"class_list":["post-3238","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql","blog_category-techblog"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/posts\/3238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/comments?post=3238"}],"version-history":[{"count":47,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/posts\/3238\/revisions"}],"predecessor-version":[{"id":4155,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/posts\/3238\/revisions\/4155"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/media\/3253"}],"wp:attachment":[{"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/media?parent=3238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/categories?post=3238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/tags?post=3238"},{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.uncovertruth.co.jp\/dx-accelerator\/wp-json\/wp\/v2\/blog_category?post=3238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}