{"id":989,"date":"2024-08-19T12:47:50","date_gmt":"2024-08-19T03:47:50","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/route\/989\/"},"modified":"2025-03-13T12:30:18","modified_gmt":"2025-03-13T03:30:18","slug":"989","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/989\/","title":{"rendered":"\u3010SQL\u3011\u526f\u554f\u3044\u5408\u308f\u305b\u5165\u9580\uff5c\u57fa\u672c\u69cb\u6587\u304b\u3089\u5b9f\u4f8b\u307e\u3067\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"
\n

\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u6271\u3063\u3066\u3044\u308b\u3068\u3001\u300c\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u5408\u3046\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3057\u305f\u3044\uff01\u300d\u3068\u3044\u3046\u5834\u9762\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3088\u306d\u3002
\u305d\u3093\u306a\u3068\u304d\u306b\u4fbf\u5229\u306a\u306e\u304c \u526f\u554f\u3044\u5408\u308f\u305b\uff08\u30b5\u30d6\u30af\u30a8\u30ea\uff09<\/strong> \u3067\u3059\u3002
\u4eca\u56de\u306f\u3001\u526f\u554f\u3044\u5408\u308f\u305b\u306e\u57fa\u672c\u304b\u3089\u4f7f\u3044\u65b9\u307e\u3067\u3001\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n

\n

1. \u526f\u554f\u3044\u5408\u308f\u305b\uff08\u30b5\u30d6\u30af\u30a8\u30ea\uff09\u3068\u306f\uff1f<\/h2>\n

\u526f\u554f\u3044\u5408\u308f\u305b\uff08\u30b5\u30d6\u30af\u30a8\u30ea\uff09\u3068\u306f\u3001 SQL\u306e\u4e2d\u3067\u300c\u5225\u306eSELECT\u6587\u306e\u7d50\u679c\u300d\u3092\u5229\u7528\u3059\u308b\u3053\u3068<\/strong> \u3067\u3059\u3002
\u7c21\u5358\u306b\u8a00\u3046\u3068\u3001\u300c\u3042\u308bSELECT\u6587\u306e\u7d50\u679c\u3092\u4f7f\u3063\u3066\u3001\u5225\u306eSELECT\u6587\u3092\u5b9f\u884c\u3059\u308b<\/strong>\u300d\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n

\u4f8b\u3048\u3070\u3001\u6b21\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

\u3053\u306e\u5834\u5408\u3001<\/p>\n

    \n
  1. \n

    \u300c\u5168\u4f53\u306e\u5e73\u5747\u58f2\u4e0a\u3092\u6c42\u3081\u308b\u300dSELECT\u6587<\/strong> \u3092\u4f5c\u308b<\/p>\n<\/li>\n

  2. \n

    \u305d\u306e\u7d50\u679c\u3092 \u30e1\u30a4\u30f3\u306eSELECT\u6587<\/strong> \u3067\u4f7f\u7528\u3059\u308b<\/p>\n<\/li>\n<\/ol>\n

    \u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u6c42\u3081\u308b\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\uff01<\/p>\n

    \n

    2. \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u57fa\u672c\u69cb\u6587<\/h2>\n

    \u526f\u554f\u3044\u5408\u308f\u305b\u306f\u3001 WHERE\u53e5\u30fbSELECT\u53e5\u30fbFROM\u53e5\u306a\u3069\u3067\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/strong>
    \u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n

    SELECT \u5217\u540d\r\nFROM \u30c6\u30fc\u30d6\u30eb\u540d\r\nWHERE \u5217\u540d \u6bd4\u8f03\u6f14\u7b97\u5b50 (\u526f\u554f\u3044\u5408\u308f\u305b);<\/code><\/pre>\n
    \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u7d50\u679c\u304c\u5358\u4e00\u306e\u5024\u306a\u3089 = \u3092\u4f7f\u3044\u3001\u8907\u6570\u306e\u5024\u3092\u8fd4\u3059\u5834\u5408\u306f IN \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
    \n
    3. \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u5b9f\u4f8b<\/h2>\n
    \u00a0\u4f8b1\uff1a\u58f2\u4e0a\u304c\u5e73\u5747\u3088\u308a\u9ad8\u3044\u5546\u54c1\u3092\u53d6\u5f97<\/h3>\n
    \u307e\u305a\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a sales \u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n
    +----+--------+------+\r\n| id |<\/span> \u5546\u54c1\u540d | \u58f2\u4e0a |<\/span>\r\n+----+--------+------+\r\n|  1 |<\/span> \u5546\u54c1A  | 5000 |<\/span>\r\n|  2 |<\/span> \u5546\u54c1B  |12000 |<\/span>\r\n|  3 |<\/span> \u5546\u54c1C  | 8000 |<\/span>\r\n|  4 |<\/span> \u5546\u54c1D  |15000 |<\/span>\r\n+----+--------+------+<\/code><\/pre>\n
    \u3053\u306e\u30c7\u30fc\u30bf\u304b\u3089\u3001 \u58f2\u4e0a\u304c\u5168\u4f53\u306e\u5e73\u5747\u3088\u308a\u9ad8\u3044\u5546\u54c1<\/strong> \u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u526f\u554f\u3044\u5408\u308f\u305b\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
    SELECT \u5546\u54c1\u540d, \u58f2\u4e0a\r\nFROM sales\r\nWHERE \u58f2\u4e0a > (SELECT AVG<\/span>(\u58f2\u4e0a)<\/span> FROM sales)<\/span>;<\/code><\/pre>\n
    \u3069\u3046\u52d5\u304f\uff1f<\/h3>\n
      \n
    1. \n
      (SELECT AVG(\u58f2\u4e0a) FROM sales) \u3067 \u5168\u4f53\u306e\u5e73\u5747\u58f2\u4e0a<\/strong> \u3092\u53d6\u5f97<\/p>\n<\/li>\n
    2. \n
      \u305d\u306e\u7d50\u679c\u3092 WHERE \u306e\u6761\u4ef6\u306b\u4f7f\u3044\u3001\u5e73\u5747\u3088\u308a\u9ad8\u3044\u58f2\u4e0a\u306e\u5546\u54c1<\/strong> \u3092\u53d6\u5f97<\/p>\n<\/li>\n<\/ol>\n
      \n
      4. \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u7a2e\u985e<\/h2>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u306b\u306f 3\u3064\u306e\u7a2e\u985e<\/strong> \u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      \u2460 \u30b9\u30ab\u30e9\u30fc\u30b5\u30d6\u30af\u30a8\u30ea\uff08\u5358\u4e00\u306e\u5024\u3092\u8fd4\u3059\uff09<\/h3>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u7d50\u679c\u304c 1\u3064\u306e\u5024\uff081\u884c1\u5217\uff09<\/strong> \u306b\u306a\u308b\u5834\u5408\u3002<\/p>\n
      \u6700\u3082\u9ad8\u3044\u58f2\u4e0a\u3092\u6301\u3064\u5546\u54c1\u306e\u53d6\u5f97<\/p>\n
      SELECT \u5546\u54c1\u540d, \u58f2\u4e0a\r\nFROM sales\r\nWHERE \u58f2\u4e0a = (SELECT MAX<\/span>(\u58f2\u4e0a)<\/span> FROM sales)<\/span>;<\/code><\/pre>\n
      \u2461 \u30c6\u30fc\u30d6\u30eb\u30b5\u30d6\u30af\u30a8\u30ea\uff08\u8907\u6570\u306e\u5024\u3092\u8fd4\u3059\uff09<\/h3>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u306e\u7d50\u679c\u304c \u8907\u6570\u306e\u884c\u306b\u306a\u308b<\/strong> \u5834\u5408\u3002<\/p>\n
      \u30fb\u58f2\u4e0a\u304c5000\u5186\u4ee5\u4e0a\u306e\u5546\u54c1ID\u3092\u6301\u3064\u6ce8\u6587\u30c7\u30fc\u30bf\u3092\u53d6\u5f97<\/p>\n
      \u307e\u305a\u3001\u4ee5\u4e0b\u306e orders \u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n
      +----+------------+------+\r\n| id |<\/span> product_id | \u6ce8\u6587\u6570 |<\/span>\r\n+----+------------+------+\r\n|  1 |<\/span>     1<\/span>      |   2   |<\/span>\r\n|  2 |<\/span>     2<\/span>      |   1   |<\/span>\r\n|  3 |<\/span>     3<\/span>      |   5   |<\/span>\r\n|  4 |<\/span>     4<\/span>      |   3   |<\/span>\r\n+----+------------+------+<\/code><\/pre>\n
      \u3053\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3001\u58f2\u4e0a\u304c5000\u5186\u4ee5\u4e0a\u306e\u5546\u54c1\u306b\u95a2\u3059\u308b\u6ce8\u6587\u3092\u53d6\u5f97\u3059\u308b\u5834\u5408\u3001\u4ee5\u4e0b\u306eSQL\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n
      SELECT *\r\nFROM orders\r\nWHERE product_id IN<\/span> (SELECT id FROM sales WHERE \u58f2\u4e0a >= 5000<\/span>)<\/span><\/span>;<\/code><\/pre>\n
      \u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\uff08\u30e1\u30a4\u30f3\u306e\u30af\u30a8\u30ea\u3068\u95a2\u9023\u3059\u308b\uff09<\/h3>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u304c \u30e1\u30a4\u30f3\u306e\u30af\u30a8\u30ea\u306e\u30c7\u30fc\u30bf\u3054\u3068\u306b\u5b9f\u884c\u3055\u308c\u308b<\/strong> \u3082\u306e\u3002<\/p>\n
      \u30fb\u5404\u5546\u54c1\u306e\u58f2\u4e0a\u304c\u3001\u305d\u306e\u5546\u54c1\u30ab\u30c6\u30b4\u30ea\u5185\u306e\u5e73\u5747\u3088\u308a\u9ad8\u3044\u304b\u3092\u5224\u5b9a<\/p>\n
      SELECT \u5546\u54c1\u540d, \u58f2\u4e0a\r\nFROM sales s1\r\nWHERE \u58f2\u4e0a > (SELECT AVG<\/span>(\u58f2\u4e0a)<\/span> FROM sales s2 WHERE s1.\u30ab\u30c6\u30b4\u30eaID <\/span>= s2.\u30ab\u30c6\u30b4\u30eaID);<\/code><\/pre>\n
      \u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5404\u884c\u3054\u3068\u306b\u526f\u554f\u3044\u5408\u308f\u305b\u304c\u5b9f\u884c\u3055\u308c\u308b\u306e\u3067\u3001\u30c7\u30fc\u30bf\u304c\u591a\u3044\u3068\u51e6\u7406\u304c\u9045\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308b\uff01<\/p>\n
      5. \u526f\u554f\u3044\u5408\u308f\u305b vs JOIN \u306e\u4f7f\u3044\u5206\u3051<\/h2>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u3068 JOIN \u306f\u4f3c\u305f\u3088\u3046\u306a\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u306b\u5411\u304d\u30fb\u4e0d\u5411\u304d\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      +------------+------------------------+---------------------------+\r\n| \u6bd4\u8f03\u9805\u76ee   |<\/span> \u526f\u554f\u3044\u5408\u308f\u305b            | JOIN                      |<\/span>\r\n+------------+------------------------+---------------------------+\r\n| \u53ef\u8aad\u6027     |<\/span> \u30b7\u30f3\u30d7\u30eb\u306a\u5834\u5408\u306f\u8aad\u307f\u3084\u3059\u3044 | \u30c6\u30fc\u30d6\u30eb\u304c\u5897\u3048\u308b\u3068\u8aad\u307f\u306b\u304f\u3044 |<\/span>\r\n| \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9 |<\/span> \u5927\u91cf\u30c7\u30fc\u30bf\u3060\u3068\u9045\u304f\u306a\u308b  | \u4e00\u822c\u7684\u306b\u901f\u3044               |<\/span>\r\n| \u4f7f\u3044\u6240     |<\/span> \u5358\u7d14\u306a\u6761\u4ef6\u306b\u4fbf\u5229        | \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3092\u6271\u3046\u3068\u304d      |<\/span>\r\n+------------+------------------------+---------------------------+<\/code><\/pre>\n
      \u4f8b\u3048\u3070\u3001\u5148\u307b\u3069\u306e \u58f2\u4e0a\u304c5000\u5186\u4ee5\u4e0a\u306e\u5546\u54c1ID\u3092\u6301\u3064\u6ce8\u6587\u30c7\u30fc\u30bf\u306e\u53d6\u5f97<\/strong> \u3067\u306f\u3001JOIN \u3092\u4f7f\u3046\u3068\u3088\u308a\u52b9\u7387\u7684\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
      SELECT orders.*\r\nFROM orders\r\nJOIN sales ON orders.product_id = sales.id\r\nWHERE sales.\u58f2\u4e0a >= 5000;<\/code><\/pre>\n
      \u526f\u554f\u3044\u5408\u308f\u305b\u306f\u4fbf\u5229\u3060\u3051\u3069\u3001\u5927\u91cf\u30c7\u30fc\u30bf\u3092\u6271\u3046\u5834\u5408\u306fJOIN\u306e\u65b9\u304c\u52b9\u7387\u7684\uff01<\/p>\n
      6. \u307e\u3068\u3081<\/h2>\n
      \u30fb\u526f\u554f\u3044\u5408\u308f\u305b\uff08\u30b5\u30d6\u30af\u30a8\u30ea\uff09\u306f\u300cSELECT\u6587\u306e\u4e2d\u306b\u5165\u308c\u5b50\u306b\u306a\u3063\u305fSELECT\u6587\u300d<\/strong>
      \u30fbWHERE\u30fbSELECT\u30fbFROM \u306a\u3069\u3067\u4f7f\u3048\u308b<\/strong>
      \u30fb\u30b9\u30ab\u30e9\u30fc\u30b5\u30d6\u30af\u30a8\u30ea\u30fb\u30c6\u30fc\u30d6\u30eb\u30b5\u30d6\u30af\u30a8\u30ea\u30fb\u76f8\u95a2\u30b5\u30d6\u30af\u30a8\u30ea\u306e3\u7a2e\u985e\u304c\u3042\u308b<\/strong>
      \u30fbJOIN\u3092\u4f7f\u3046\u65b9\u304c\u901f\u3044\u5834\u5408\u3082\u3042\u308b\u306e\u3067\u3001\u9069\u6750\u9069\u6240\u3067\u4f7f\u3044\u5206\u3051\u3088\u3046\uff01<\/strong><\/p>\n
      \u6700\u5f8c\u306b<\/h2>\n
      \u6700\u521d\u306f \u300c\u30b5\u30d6\u30af\u30a8\u30ea\u3063\u3066\u96e3\u3057\u305d\u3046\u2026\u300d<\/strong> \u3068\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u5b9f\u969b\u306b\u66f8\u3044\u3066\u307f\u308b\u3068\u3059\u3050\u6163\u308c\u307e\u3059\uff01
      \u7279\u306b \u30c7\u30fc\u30bf\u3092\u6761\u4ef6\u4ed8\u304d\u3067\u7d5e\u308a\u8fbc\u3080\u3068\u304d\u306b\u4fbf\u5229<\/strong> \u306a\u306e\u3067\u3001\u305c\u3072\u6d3b\u7528\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
      \u300c\u307e\u305a\u306f\u8a66\u3057\u3066\u307f\u308b\uff01\u300d\u304c\u4e0a\u9054\u306e\u30b3\u30c4\u3067\u3059\uff01<\/p>\n<\/div>\n","protected":false},"featured_media":990,"template":"","_links":{"self":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route\/989"}],"collection":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route"}],"about":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/types\/route"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media\/990"}],"wp:attachment":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media?parent=989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}