{"id":5420,"date":"2025-07-29T00:51:17","date_gmt":"2025-07-28T15:51:17","guid":{"rendered":"https:\/\/sky-peace.net\/?p=5420"},"modified":"2025-07-29T00:51:17","modified_gmt":"2025-07-28T15:51:17","slug":"sql-ailias","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/sql-ailias\/","title":{"rendered":"SQL\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u3082\u3046\u6016\u304f\u306a\u3044\uff01\u5fdc\u7528\u60c5\u5831\u30fb\u9ad8\u5ea6\u8a66\u9a13\u306e\u5f97\u70b9\u6e90\u306b\u5909\u3048\u308b\u601d\u8003\u6cd5"},"content":{"rendered":"<p>\u5fdc\u7528\u60c5\u5831\u6280\u8853\u8005\u8a66\u9a13\u3084\u9ad8\u5ea6IT\u8a66\u9a13\u306e\u5348\u5f8c\u554f\u984c\u3001\u7279\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5206\u91ce\u3067\u591a\u304f\u306e\u53d7\u9a13\u8005\u304c\u3064\u307e\u305a\u304f\u30dd\u30a4\u30f3\u30c8\u306e\u4e00\u3064\u306b\u3001SQL\u306e\u300c\u30a8\u30a4\u30ea\u30a2\u30b9\uff08\u5225\u540d\uff09\u300d\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u554f\u984c\u6587\u306eSQL\u3092\u8aad\u307f\u9032\u3081\u3066\u3044\u308b\u3068\u3001<code>FROM TABLE_A <strong>T1<\/strong>, TABLE_B <strong>T2<\/strong><\/code> \u306e\u3088\u3046\u306b\u3001\u4f55\u306e\u8aac\u660e\u3082\u306a\u304f\u77ed\u3044\u82f1\u6570\u5b57\u304c\u73fe\u308c\u3001\u3053\u308c\u304c\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u6307\u3057\u3066\u3044\u308b\u306e\u304b\u77ac\u6642\u306b\u5224\u65ad\u3067\u304d\u305a\u3001\u6df7\u4e71\u3057\u3066\u3057\u307e\u3063\u305f\u7d4c\u9a13\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u3053\u306e\u6df7\u4e71\u306e\u591a\u304f\u306f\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u5358\u306a\u308b\u300c\u7701\u7565\u8a18\u6cd5\u300d\u3068\u3057\u3066\u8868\u9762\u7684\u306b\u6349\u3048\u3066\u3044\u308b\u3053\u3068\u306b\u8d77\u56e0\u3057\u307e\u3059\u3002<br \/>\n\u672c\u5f53\u306b\u91cd\u8981\u306a\u306e\u306f\u3001<strong>\u300c\u306a\u305c\u3001\u305d\u306e\u5834\u6240\u3067\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u6709\u52b9\u306b\u306a\u308b\u306e\u304b\u300d<\/strong>\u3068\u3044\u3046\u3001SQL\u69cb\u6587\u304c\u6301\u3064\u6839\u672c\u7684\u306a\u30eb\u30fc\u30eb\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u5358\u306b\u69cb\u6587\u3092\u89e3\u8aac\u3059\u308b\u3060\u3051\u3067\u306f\u306a\u304f\u3001SQL\u304c\u5185\u90e8\u3067\u3069\u306e\u3088\u3046\u306b\u89e3\u91c8\u3055\u308c\u3066\u3044\u308b\u306e\u304b\uff08\u8a55\u4fa1\u9806\u5e8f\uff09\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304b\u3089\u4e01\u5be7\u306b\u89e3\u304d\u660e\u304b\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u305d\u306e\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u300c\u6df7\u4e71\u306e\u5143\u300d\u3067\u306f\u306a\u304f\u3001<strong>\u300c\u8907\u96d1\u306aSQL\u6587\u306e\u69cb\u9020\u3092\u6b63\u78ba\u306b\u8aad\u307f\u89e3\u304f\u305f\u3081\u306e\u4fbf\u5229\u306a\u30c4\u30fc\u30eb\u300d<\/strong>\u3068\u3057\u3066\u3001\u81ea\u4fe1\u3092\u6301\u3063\u3066\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308b\u3053\u3068\u304c\u30b4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<p>\u3069\u3093\u306aSQL\u6587\u304c\u51fa\u3066\u304d\u3066\u3082\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u6238\u60d1\u3046\u3053\u3068\u306a\u304f\u3001\u51b7\u9759\u306b\u8aad\u307f\u89e3\u304f\u305f\u3081\u306e\u601d\u8003\u6cd5\u3092\u8eab\u306b\u3064\u3051\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u30101. \u30a4\u30f3\u30c8\u30ed\u30c0\u30af\u30b7\u30e7\u30f3\u3011\u306a\u305c\u3001SQL\u306e\u300cT1\u300d\u306f\u7a81\u7136\u73fe\u308c\u308b\u306e\u304b\uff1f<\/h3>\n<p>\u5fdc\u7528\u60c5\u5831\u6280\u8853\u8005\u8a66\u9a13\u306e\u5348\u5f8c\u554f\u984c\u3002\u3042\u306a\u305f\u306f\u4eca\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5206\u91ce\u306e\u554f\u984c\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u307e\u3059\u3002<br \/>\n\u554f\u984c\u6587\u3092\u8aad\u307f\u89e3\u304d\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u3092\u628a\u63e1\u3057\u3001\u300c\u3088\u3057\u3001\u3042\u3068\u306f\u3053\u306eSQL\u6587\u3092\u89e3\u6790\u3059\u308c\u3070\u89e3\u3051\u308b\u305e\u300d\u3068\u610f\u6c17\u8fbc\u3093\u3060\u305d\u306e\u77ac\u9593\u3001\u3042\u306a\u305f\u306e\u601d\u8003\u306f\u30d4\u30bf\u30ea\u3068\u6b62\u307e\u308a\u307e\u3059\u3002<\/p>\n<p><code>SELECT <strong>T1<\/strong>.Name, <strong>T2<\/strong>.Price FROM Products <strong>T1<\/strong> JOIN Sales <strong>T2<\/strong> ON T1.ID = T2.ProductID ...<\/code><\/p>\n<p>\u300c\u3053\u306e\u300eT1\u300f\u3084\u300eT2\u300f\u306f\u4e00\u4f53\u4f55\u306a\u3093\u3060\u308d\u3046\u2026\uff1f\u300d<\/p>\n<p>Products\u30c6\u30fc\u30d6\u30eb\u3084Sales\u30c6\u30fc\u30d6\u30eb\u3092\u6307\u3057\u3066\u3044\u308b\u306e\u3060\u308d\u3046\u3001\u3068\u4f55\u3068\u306a\u304f\u306f\u63a8\u6e2c\u3067\u304d\u3066\u3082\u3001\u306a\u305c\u305d\u3093\u306a\u5206\u304b\u308a\u306b\u304f\u3044\u66f8\u304d\u65b9\u3092\u3059\u308b\u306e\u304b\u3001\u8151\u306b\u843d\u3061\u306a\u3044\u307e\u307e\u8aad\u307f\u9032\u3081\u308b\u306e\u306f\u6c17\u6301\u3061\u304c\u60aa\u3044\u3082\u306e\u3067\u3059\u3002\u7279\u306b\u3001JOIN\u3084\u526f\u554f\u5408\u305b\u304c\u8907\u96d1\u306b\u7d61\u307f\u5408\u3063\u305fSQL\u6587\u3067\u306f\u3001\u3053\u306e\u77ed\u3044\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u6df7\u4e71\u306b\u62cd\u8eca\u3092\u304b\u3051\u3001\u8aad\u3080\u6c17\u529b\u3055\u3048\u596a\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u5b89\u5fc3\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u60a9\u307f\u306f\u3001\u3042\u306a\u305f\u3060\u3051\u304c\u62b1\u3048\u3066\u3044\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u591a\u304f\u306eIT\u6280\u8853\u8005\u5b66\u7fd2\u8005\u304c\u4e00\u5ea6\u306f\u901a\u308b\u300c<strong>\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u58c1<\/strong>\u300d\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u306e\u58c1\u3092\u4e57\u308a\u8d8a\u3048\u308b\u305f\u3081\u306b\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u6b63\u4f53\u3068\u305d\u306e\u4ed5\u7d44\u307f\u3001\u305d\u3057\u3066\u8a66\u9a13\u672c\u756a\u3067\u6df7\u4e71\u3057\u306a\u3044\u305f\u3081\u306e\u5177\u4f53\u7684\u306a\u601d\u8003\u6cd5\u307e\u3067\u3001\u9806\u3092\u8ffd\u3063\u3066\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u8aad\u307f\u7d42\u3048\u308b\u9803\u306b\u306f\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3078\u306e\u82e6\u624b\u610f\u8b58\u306f\u306a\u304f\u306a\u3063\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<h3>\u30102. \u7d50\u8ad6\u30d5\u30a1\u30fc\u30b9\u30c8\u3011\u30a8\u30a4\u30ea\u30a2\u30b9\u3068\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u3084\u5217\u306b\u4ed8\u3051\u308b\u300c\u3042\u3060\u540d\u300d\u3067\u3042\u308b<\/h3>\n<p>\u65e9\u901f\u3001\u7d50\u8ad6\u304b\u3089\u304a\u4f1d\u3048\u3057\u307e\u3059\u3002<\/p>\n<p>SQL\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\uff08\u5225\u540d\uff09\u3068\u306f\u3001\u4e00\u8a00\u3067\u3044\u3048\u3070<strong>\u30c6\u30fc\u30d6\u30eb\u3084\u5217\u306b\u4ed8\u3051\u308b\u300c\u3042\u3060\u540d\uff08\u30cb\u30c3\u30af\u30cd\u30fc\u30e0\uff09\u300d<\/strong>\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u3042\u306a\u305f\u306e\u30af\u30e9\u30b9\u306b\u300c\u7530\u4e2d\u592a\u90ce\u300d\u3055\u3093\u3068\u300c\u9234\u6728\u6b21\u90ce\u300d\u3055\u3093\u304c\u3044\u305f\u3068\u3057\u307e\u3059\u3002\u6bce\u56de\u30d5\u30eb\u30cd\u30fc\u30e0\u3067\u547c\u3076\u306e\u306f\u5c11\u3057\u9577\u3044\u306e\u3067\u3001\u305d\u308c\u305e\u308c\u300c\u7530\u4e2d\u3055\u3093\u300d\u300c\u9234\u6728\u3055\u3093\u300d\u3068\u547c\u3076\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3088\u306d\u3002SQL\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u3082\u3001\u8003\u3048\u65b9\u306f\u3053\u308c\u3068\u5168\u304f\u540c\u3058\u3067\u3059\u3002<\/p>\n<p><code>Products<\/code>\u3068\u3044\u3046\u9577\u3044\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u6bce\u56de\u66f8\u304f\u4ee3\u308f\u308a\u306b<code>P<\/code>\u3068\u3044\u3046\u3042\u3060\u540d\u3092\u4ed8\u3051\u305f\u308a\u3001<code>Sales_Transaction_Details<\/code>\u3068\u3044\u3046\u3068\u3066\u3064\u3082\u306a\u304f\u9577\u3044\u30c6\u30fc\u30d6\u30eb\u540d\u306b<code>T1<\/code>\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u540d\u524d\u3092\u4ed8\u3051\u3066\u3001SQL\u6587\u5168\u4f53\u3092\u30b9\u30c3\u30ad\u30ea\u3055\u305b\u308b\u3002\u305f\u3060\u305d\u308c\u3060\u3051\u306e\u3053\u3068\u306a\u306e\u3067\u3059\u3002<\/p>\n<p>\u307e\u305a\u306f\u3053\u306e\u300c\u30a8\u30a4\u30ea\u30a2\u30b9\uff1d\u3042\u3060\u540d\u300d\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u672c\u8cea\u3092\u3001\u982d\u306b\u30a4\u30f3\u30d7\u30c3\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\u300c\u8b0e\u306e\u6697\u53f7\u300d\u3067\u306f\u306a\u304f\u300c\u4fbf\u5229\u306a\u3042\u3060\u540d\u300d\u3068\u6349\u3048\u76f4\u3059\u3053\u3068\u304c\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3078\u306e\u82e6\u624b\u610f\u8b58\u3092\u514b\u670d\u3059\u308b\u3001\u91cd\u8981\u3067\u3001\u305d\u3057\u3066\u6700\u3082\u7c21\u5358\u306a\u7b2c\u4e00\u6b69\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30103. \u5927\u56f3\u89e3\uff1a\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u5168\u4f53\u50cf\u3068\u4ed5\u7d44\u307f\u3011<\/h3>\n<p>\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u300c\u3042\u3060\u540d\u300d\u3067\u3042\u308b\u3068\u5206\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u6b21\u306f\u305d\u306e\u4f7f\u3044\u65b9\u3068\u3001\u6700\u3082\u91cd\u8981\u306a\u300c\u4ed5\u7d44\u307f\u300d\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u306f\u5927\u304d\u304f\u5206\u3051\u30662\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<\/p>\n<h4>1. \u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\uff1a\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u3060\u540d<\/h4>\n<p>\u3053\u308c\u306f\u3001FROM\u53e5\u3084JOIN\u53e5\u3067\u30c6\u30fc\u30d6\u30eb\u306b\u3042\u3060\u540d\u3092\u4ed8\u3051\u308b\u65b9\u6cd5\u3067\u3059\u3002\u7279\u306b\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\uff08JOIN\uff09\u3059\u308b\u3068\u304d\u306b\u3001\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u304b\u3092\u660e\u78ba\u306b\u3059\u308b\u305f\u3081\u306b\u7d76\u5927\u306a\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002<\/p>\n<p><strong>\u66f8\u304d\u65b9\uff1a<\/strong><br \/><code>FROM \u30c6\u30fc\u30d6\u30eb\u540d AS \u3042\u3060\u540d<\/code><br \/>\u307e\u305f\u306f\u3001<code>AS<\/code>\u3092\u7701\u7565\u3057\u3066<br \/><code>FROM \u30c6\u30fc\u30d6\u30eb\u540d \u3042\u3060\u540d<\/code><\/p>\n<p>\u5fdc\u7528\u60c5\u5831\u6280\u8853\u8005\u8a66\u9a13\u3067\u306f\u3001\u5f8c\u8005\u306e<code>AS<\/code>\u3092\u7701\u7565\u3059\u308b\u5f62\u5f0f\u304c\u975e\u5e38\u306b\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002\u3053\u308c\u304c\u300c\u3044\u304d\u306a\u308aT1\u304c\u51fa\u3066\u304f\u308b\u300d\u3088\u3046\u306b\u898b\u3048\u308b\u539f\u56e0\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n<p><strong>\u5177\u4f53\u4f8b\uff1a<\/strong><\/p>\n<pre><code>SELECT\n    P.ProductName, -- \u2190 P\u306fProducts\u30c6\u30fc\u30d6\u30eb\u306e\u3053\u3068\n    S.SaleDate     -- \u2190 S\u306fSales\u30c6\u30fc\u30d6\u30eb\u306e\u3053\u3068\nFROM\n    Products P     -- Products\u30c6\u30fc\u30d6\u30eb\u306b\u300cP\u300d\u3068\u3044\u3046\u3042\u3060\u540d\u3092\u4ed8\u3051\u308b\nJOIN\n    Sales S ON P.ProductID = S.ProductID; -- Sales\u30c6\u30fc\u30d6\u30eb\u306b\u300cS\u300d\u3068\u3044\u3046\u3042\u3060\u540d\u3092\u4ed8\u3051\u308b\n<\/code><\/pre>\n<h4>2. \u5217\u30a8\u30a4\u30ea\u30a2\u30b9\uff1a\u5217\u306e\u3042\u3060\u540d<\/h4>\n<p>\u3053\u308c\u306f\u3001SELECT\u53e5\u3067\u5217\u306b\u3042\u3060\u540d\u3092\u4ed8\u3051\u308b\u65b9\u6cd5\u3067\u3059\u3002\u8a08\u7b97\u7d50\u679c\u306e\u5217\uff08\u4f8b\uff1a\u5358\u4fa1\u00d7\u6570\u91cf\uff09\u3084\u3001\u5143\u3005\u306e\u5217\u540d\u304c\u5206\u304b\u308a\u306b\u304f\u3044\u5834\u5408\u306b\u3001\u65e5\u672c\u8a9e\u306a\u3069\u306e\u5206\u304b\u308a\u3084\u3059\u3044\u540d\u524d\u3092\u4ed8\u3051\u308b\u969b\u306b\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u66f8\u304d\u65b9\uff1a<\/strong><br \/><code>SELECT \u5217\u540d AS \u3042\u3060\u540d<\/code><br \/>\u307e\u305f\u306f\u3001<code>AS<\/code>\u3092\u7701\u7565\u3057\u3066<br \/><code>SELECT \u5217\u540d \u3042\u3060\u540d<\/code><br \/>\u203b\u5217\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u5834\u5408\u3001\u65e5\u672c\u8a9e\u306a\u3069\u3092\u4f7f\u3046\u969b\u306f\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u56f2\u3080\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\uff08\u4f8b\uff1a<code>AS \"\u58f2\u4e0a\u91d1\u984d\"<\/code>\uff09<\/p>\n<hr>\n<h4>\u3010\u6700\u91cd\u8981\u3011\u306a\u305c\u4f7f\u3048\u308b\uff1f SQL\u304c\u30af\u30a8\u30ea\u3092\u8aad\u3080\u9806\u756a<\/h4>\n<p>\u300c\u306a\u305cFROM\u53e5\u3067\u5b9a\u7fa9\u3057\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u3060\u540d\uff08P\u3084S\uff09\u3092\u3001SELECT\u53e5\u3067\u4f7f\u3048\u308b\u306e\uff1f\u300d<br \/>\u3053\u306e\u7591\u554f\u3053\u305d\u304c\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u7406\u89e3\u306e\u6838\u5fc3\u3067\u3059\u3002\u7b54\u3048\u306f\u3001<strong>SQL\u30a8\u30f3\u30b8\u30f3\u304c\u30af\u30a8\u30ea\u3092\u89e3\u91c8\u3059\u308b\u9806\u756a<\/strong>\u306b\u96a0\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306f\u4e0a\u304b\u3089\u9806\u306b<code>SELECT<\/code>\u2192<code>FROM<\/code>\u3068\u8aad\u307f\u307e\u3059\u304c\u3001SQL\u30a8\u30f3\u30b8\u30f3\u306f\u4eba\u9593\u3068\u306f\u9055\u3046\u9806\u756a\u3067\u89e3\u91c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"important-box\">\n<p><strong>SQL\u306e\u4e3b\u306a\u8a55\u4fa1\u9806\u5e8f\uff08\u6982\u5ff5\uff09<\/strong><\/p>\n<ol>\n<li><strong>FROM\u53e5, JOIN\u53e5<\/strong>\uff1a\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u3046\u304b\u3001\u3069\u3046\u7d50\u5408\u3059\u308b\u304b\u3092\u6700\u521d\u306b\u78ba\u5b9a\u3055\u305b\u308b\u3002<strong>\uff08\u3053\u3053\u3067\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u3060\u540d\u304c\u6c7a\u307e\u308b\uff01\uff09<\/strong><\/li>\n<li><strong>WHERE\u53e5<\/strong>\uff1a\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3069\u306e\u884c\u3092\u7d5e\u308a\u8fbc\u3080\u304b\u3092\u6c7a\u3081\u308b\u3002<\/li>\n<li><strong>GROUP BY\u53e5<\/strong>\uff1a\u3069\u306e\u5217\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b\u304b\u3092\u6c7a\u3081\u308b\u3002<\/li>\n<li><strong>HAVING\u53e5<\/strong>\uff1a\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u305f\u5f8c\u3001\u3069\u306e\u30b0\u30eb\u30fc\u30d7\u3092\u6b8b\u3059\u304b\u3092\u6c7a\u3081\u308b\u3002<\/li>\n<li><strong>SELECT\u53e5<\/strong>\uff1a\u6700\u7d42\u7684\u306b\u3069\u306e\u5217\u3092\u8868\u793a\u3059\u308b\u304b\u3092\u6c7a\u3081\u308b\u3002<strong>\uff08\u3053\u306e\u6642\u70b9\u3067\u306f\u3001\u3082\u3046\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u3060\u540d\u306f\u78ba\u5b9a\u6e08\u307f\uff01\uff09<\/strong><\/li>\n<li><strong>ORDER BY\u53e5<\/strong>\uff1a\u3069\u306e\u9806\u5e8f\u3067\u4e26\u3079\u308b\u304b\u3092\u6c7a\u3081\u308b\u3002<\/li>\n<\/ol>\n<\/div>\n<p>\u3053\u306e\u6d41\u308c\u3092\u898b\u308c\u3070\u4e00\u76ee\u77ad\u7136\u3067\u3059\u306d\u3002<br \/>SQL\u30a8\u30f3\u30b8\u30f3\u306f\u3001<code>SELECT<\/code>\u53e5\u3092\u8aad\u3080\u3088\u308a<strong>\u5148\u306b<\/strong><code>FROM<\/code>\u53e5\u3092\u8aad\u3093\u3067\u3001\u30c6\u30fc\u30d6\u30eb\u3068\u3001\u305d\u3053\u3067\u4ed8\u3051\u3089\u308c\u305f\u3042\u3060\u540d\u3092\u982d\u306b\u5165\u308c\u3066\u3044\u307e\u3059\u3002\u3060\u304b\u3089\u3001\u5f8c\u304b\u3089\u8aad\u3080<code>SELECT<\/code>\u53e5\u3084<code>WHERE<\/code>\u53e5\u3067\u3001\u305d\u306e\u3042\u3060\u540d\u3092\u5f53\u305f\u308a\u524d\u306e\u3088\u3046\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u300c<strong>FROM\u304c\u5148\u3001SELECT\u306f\u5f8c<\/strong>\u300d\u3068\u3044\u3046\u4ed5\u7d44\u307f\u3055\u3048\u7406\u89e3\u3059\u308c\u3070\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u6238\u60d1\u3046\u3053\u3068\u306f\u5287\u7684\u306b\u6e1b\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<h3>\u30104. \u306a\u305c\uff1f\u304c\u308f\u304b\u308b\u6df1\u6398\u308a\u89e3\u8aac\u3011<\/h3>\n<p>\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u4ed5\u7d44\u307f\u304c\u5206\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u591a\u304f\u306e\u4eba\u304c\u62b1\u304f\u3044\u304f\u3064\u304b\u306e\u7591\u554f\u306b\u3064\u3044\u3066\u3001\u3055\u3089\u306b\u6df1\u6398\u308a\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>Q1. \u305d\u3082\u305d\u3082\u3001\u306a\u305c\u30a8\u30a4\u30ea\u30a2\u30b9\u306a\u3093\u3066\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308b\u306e\uff1f<\/h4>\n<p>A1. \u4e3b\u306b3\u3064\u306e\u7406\u7531\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u7406\u7531\u2460\uff1a\u8a18\u8ff0\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u3057\u3001SQL\u6587\u3092\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u3002<\/strong><br \/>\n  <code>Sales_Transaction_Details<\/code>\u306e\u3088\u3046\u306a\u9577\u3044\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u4f55\u5ea6\u3082\u66f8\u304f\u306e\u306f\u5927\u5909\u3067\u3059\u3057\u3001\u8aad\u307f\u306b\u304f\u3044\u3067\u3059\u3088\u306d\u3002<code>T1<\/code>\u306e\u3088\u3046\u306a\u77ed\u3044\u3042\u3060\u540d\u3092\u4ed8\u3051\u308c\u3070\u3001\u30af\u30a8\u30ea\u5168\u4f53\u304c\u30b9\u30c3\u30ad\u30ea\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u7406\u7531\u2461\uff1a\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u3092\u8907\u6570\u56de\u4f7f\u3063\u3066\u7d50\u5408\u3059\u308b\u300c\u81ea\u5df1\u7d50\u5408\u300d\u3067\u3001\u4e21\u8005\u3092\u533a\u5225\u3059\u308b\u305f\u3081\u3002<\/strong><br \/>\n  \u4f8b\u3048\u3070\u3001\u300c\u793e\u54e1\u300d\u30c6\u30fc\u30d6\u30eb\u306e\u4e2d\u304b\u3089\u300c\u4e0a\u53f8\u306e\u540d\u524d\u300d\u3092\u63a2\u3059\u5834\u5408\u3001\u300c\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\uff08\u90e8\u4e0b\u7528\uff09\u300d\u3068\u300c\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\uff08\u4e0a\u53f8\u7528\uff09\u300d\u3092\u7d50\u5408\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3068\u304d\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4f7f\u308f\u306a\u3044\u3068\u4e21\u8005\u3092\u533a\u5225\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u30a8\u30a4\u30ea\u30a2\u30b9\u304c<strong>\u5fc5\u9808<\/strong>\u3068\u306a\u308b\u5834\u9762\u3067\u3059\u3002<\/li>\n<li><strong>\u7406\u7531\u2462\uff1aSELECT\u53e5\u306e\u8a08\u7b97\u7d50\u679c\u3084\u95a2\u6570\u306e\u7d50\u679c\u306b\u3001\u5206\u304b\u308a\u3084\u3059\u3044\u540d\u524d\u3092\u4ed8\u3051\u308b\u305f\u3081\u3002<\/strong><br \/>\n  <code>SELECT Price * Quantity<\/code> \u3068\u66f8\u304f\u3060\u3051\u3060\u3068\u3001\u7d50\u679c\u306e\u5217\u540d\u304cDBMS\u306b\u3088\u3063\u3066\u81ea\u52d5\u7684\u306b\u6c7a\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u3053\u306b <code>AS \"\u58f2\u4e0a\"<\/code> \u3068\u5217\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001\u7d50\u679c\u304c\u4f55\u3092\u8868\u3057\u3066\u3044\u308b\u306e\u304b\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h4>Q2. \u305d\u308c\u3067\u3082\u3001\u3084\u3063\u3071\u308a\u300c\u3044\u304d\u306a\u308a\u300d\u51fa\u3066\u304f\u308b\u3088\u3046\u306b\u898b\u3048\u308b\u3093\u3060\u3051\u3069\u2026<\/h4>\n<p>A2. \u305d\u308c\u306f\u3001\u524d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u89e3\u8aac\u3057\u305f<strong>\u300cSQL\u306e\u8a55\u4fa1\u9806\u5e8f\u300d\u306b\u3088\u308b\u76ee\u306e\u932f\u899a<\/strong>\u3067\u3059\u3002<\/p>\n<p>\u79c1\u305f\u3061\u306f\u30b3\u30fc\u30c9\u3092\u4e0a\u304b\u3089\u4e0b\u306b\u8aad\u307f\u307e\u3059\u304c\u3001SQL\u30a8\u30f3\u30b8\u30f3\u306f<code>FROM<\/code>\u53e5\u3092\u5148\u306b\u8a55\u4fa1\u3057\u307e\u3059\u3002<code>FROM\u53e5<\/code>\u3067\u300cProducts\u30c6\u30fc\u30d6\u30eb\u306e\u3042\u3060\u540d\u306fP\u3067\u3059\u300d\u3068\u5ba3\u8a00\u3057\u305f\u3053\u3068\u3092\u3001SQL\u30a8\u30f3\u30b8\u30f3\u306f\u3061\u3083\u3093\u3068\u899a\u3048\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5f8c\u3067\u8a55\u4fa1\u3055\u308c\u308b<code>SELECT\u53e5<\/code>\u3067<code>P.ProductName<\/code>\u3068\u66f8\u304b\u308c\u3066\u3082\u3001\u30a8\u30f3\u30b8\u30f3\u306b\u3068\u3063\u3066\u306f\u300c\u3042\u3042\u3001Products\u30c6\u30fc\u30d6\u30eb\u306eProductName\u5217\u306e\u3053\u3068\u306d\u300d\u3068\u3001\u3054\u304f\u81ea\u7136\u306b\u89e3\u91c8\u3067\u304d\u308b\u306e\u3067\u3059\u3002<br \/>\u3053\u306e\u9806\u756a\u3092\u610f\u8b58\u3059\u308b\u3060\u3051\u3067\u3001\u932f\u899a\u306f\u6d88\u3048\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h4>Q3. <code>AS<\/code>\u306f\u4ed8\u3051\u305f\u308a\u4ed8\u3051\u306a\u304b\u3063\u305f\u308a\u3059\u308b\u3051\u3069\u3001\u3069\u3063\u3061\u304c\u6b63\u3057\u3044\u306e\uff1f<\/h4>\n<p>A3. \u3069\u3061\u3089\u3082\u6b63\u3057\u3044\u3067\u3059\u304c\u3001\u30eb\u30fc\u30eb\u3068\u6163\u7fd2\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><strong>\u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9<\/strong>\u306e\u5834\u5408\u3001<code>AS<\/code>\u306f\u7701\u7565\u53ef\u80fd\u3067\u3059\u3002\u60c5\u5831\u51e6\u7406\u6280\u8853\u8005\u8a66\u9a13\u306e\u554f\u984c\u3067\u306f\u3001<code>FROM Products P<\/code>\u306e\u3088\u3046\u306b\u3001<code>AS<\/code>\u3092<strong>\u7701\u7565\u3059\u308b\u66f8\u304d\u65b9\u304c\u591a\u3044<\/strong>\u50be\u5411\u306b\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u7701\u7565\u8a18\u6cd5\u306b\u6163\u308c\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><strong>\u5217\u30a8\u30a4\u30ea\u30a2\u30b9<\/strong>\u306e\u5834\u5408\u3082<code>AS<\/code>\u306f\u7701\u7565\u53ef\u80fd\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u306f\u53ef\u8aad\u6027\u306e\u89b3\u70b9\u304b\u3089<code>AS<\/code>\u3092\u4ed8\u3051\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u308b\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002\u7279\u306b\u3001<code>SELECT Price * Quantity \"\u58f2\u4e0a\"<\/code>\u306e\u3088\u3046\u306b\u3001\u3042\u3060\u540d\u304c\u65e5\u672c\u8a9e\u3084\u4e88\u7d04\u8a9e\uff08SQL\u3067\u7279\u5225\u306a\u610f\u5473\u3092\u6301\u3064\u5358\u8a9e\uff09\u3068\u88ab\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306f\u3001<code>AS<\/code>\u3092\u4ed8\u3051\u305f\u308a\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u56f2\u3093\u3060\u308a\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n<h3>\u30105. \u53b3\u9078\u904e\u53bb\u554f\u3068\u601d\u8003\u30c8\u30ec\u30fc\u30b9\u3011<\/h3>\n<p>\u3053\u3053\u307e\u3067\u306e\u77e5\u8b58\u3092\u4f7f\u3048\u3070\u3001\u3082\u3046\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u6016\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u5fdc\u7528\u60c5\u5831\u6280\u8853\u8005\u8a66\u9a13\u3067\u51fa\u984c\u3055\u308c\u308b\u3088\u3046\u306a\u554f\u984c\u3092\u4f8b\u306b\u3001<strong>\u672c\u756a\u3067\u7126\u3089\u306a\u3044\u305f\u3081\u306e\u601d\u8003\u30d7\u30ed\u30bb\u30b9<\/strong>\u3092\u4e00\u7dd2\u306b\u4f53\u9a13\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h4>\u8a2d\u554f<\/h4>\n<p>\u4ee5\u4e0b\u306e\u300c\u5546\u54c1\u30de\u30b9\u30bf\u300d\u3068\u300c\u58f2\u4e0a\u660e\u7d30\u300d\u306e2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3002\u5546\u54c1\u540d\u304c&#8221;\u3048\u3093\u3074\u3064&#8221;\u3067\u3042\u308b\u58f2\u4e0a\u306e\u58f2\u4e0a\u65e5\u3068\u6570\u91cf\u3092\u554f\u3044\u5408\u308f\u305b\u308bSQL\u6587\u3092\u5b8c\u6210\u3055\u305b\u3088\u3002<\/p>\n<p><strong>\u88681\uff1a\u5546\u54c1\u30de\u30b9\u30bf<\/strong><\/p>\n<table class=\"table-design\">\n<thead>\n<tr>\n<th>\u5546\u54c1\u30b3\u30fc\u30c9<\/th>\n<th>\u5546\u54c1\u540d<\/th>\n<th>\u5358\u4fa1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>S001<\/td>\n<td>\u3048\u3093\u3074\u3064<\/td>\n<td>100<\/td>\n<\/tr>\n<tr>\n<td>S002<\/td>\n<td>\u3051\u3057\u3054\u3080<\/td>\n<td>50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u88682\uff1a\u58f2\u4e0a\u660e\u7d30<\/strong><\/p>\n<table class=\"table-design\">\n<thead>\n<tr>\n<th>\u58f2\u4e0a\u756a\u53f7<\/th>\n<th>\u5546\u54c1\u30b3\u30fc\u30c9<\/th>\n<th>\u58f2\u4e0a\u65e5<\/th>\n<th>\u6570\u91cf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>S001<\/td>\n<td>2025-04-10<\/td>\n<td>10<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>S002<\/td>\n<td>2025-04-11<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>SQL\u6587\uff1a<\/strong><\/p>\n<pre><code>SELECT\n    T2.\u58f2\u4e0a\u65e5, T2.\u6570\u91cf\nFROM\n    \u5546\u54c1\u30de\u30b9\u30bf T1, \u58f2\u4e0a\u660e\u7d30 T2\nWHERE\n    T1.\u5546\u54c1\u30b3\u30fc\u30c9 = T2.\u5546\u54c1\u30b3\u30fc\u30c9\n    AND T1.\u5546\u54c1\u540d = '\u3048\u3093\u3074\u3064'\n<\/code><\/pre>\n<hr>\n<h4>\u6df7\u4e71\u3057\u306a\u3044\u305f\u3081\u306e\u601d\u8003\u30c8\u30ec\u30fc\u30b9\uff08\u5b9f\u6f14\uff09<\/h4>\n<p>\u3053\u306eSQL\u6587\u3092\u898b\u305f\u3068\u304d\u3001\u982d\u304c\u771f\u3063\u767d\u306b\u306a\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u624b\u9806\u3067\u3001\u51b7\u9759\u306b\u60c5\u5831\u3092\u6574\u7406\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<h5>\u624b\u98061\uff1a\u307e\u305a\u3001\u4f55\u3088\u308a\u3082\u5148\u306b<code>FROM<\/code>\u53e5\u306b\u6ce8\u76ee\u3059\u308b<\/h5>\n<p>SELECT\u53e5\u304b\u3089\u8aad\u3080\u7656\u3092\u3084\u3081\u3001\u6a5f\u68b0\u306e\u3088\u3046\u306b<code>FROM<\/code>\u53e5\u3092\u63a2\u3057\u307e\u3059\u3002<br \/><code>FROM \u5546\u54c1\u30de\u30b9\u30bf T1, \u58f2\u4e0a\u660e\u7d30 T2<\/code> \u3092\u898b\u3064\u3051\u307e\u3057\u305f\u306d\u3002\u3053\u3053\u304c\u5168\u3066\u306e\u59cb\u307e\u308a\u3067\u3059\u3002<\/p>\n<h5>\u624b\u98062\uff1a\u4f59\u767d\u306b\u300c\u6307\u5dee\u3057\u78ba\u8a8d\u30e1\u30e2\u300d\u3092\u4f5c\u6210\u3059\u308b<\/h5>\n<p>\u3053\u3053\u304c\u6700\u3082\u91cd\u8981\u306a\u4e00\u624b\u9593\u3067\u3059\u3002\u8a66\u9a13\u554f\u984c\u306e\u4f59\u767d\u306b\u3001\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"memo-box\">\n<p><strong>\u3010\u6307\u5dee\u3057\u78ba\u8a8d\u30e1\u30e2\u3011<\/strong><\/p>\n<p><strong>T1 = \u5546\u54c1\u30de\u30b9\u30bf<\/strong><br \/>\n<strong>T2 = \u58f2\u4e0a\u660e\u7d30<\/strong><\/p>\n<\/div>\n<p>\u305f\u3063\u305f\u3053\u308c\u3060\u3051\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u7269\u7406\u7684\u306a\u66f8\u304d\u51fa\u3057\u304c\u3001\u3042\u306a\u305f\u306e\u8133\u306e\u30e1\u30e2\u30ea\u3092\u5927\u5e45\u306b\u7bc0\u7d04\u3057\u3001\u6df7\u4e71\u3092\u9632\u3044\u3067\u304f\u308c\u307e\u3059\u3002\u3042\u3060\u540d\u3068\u305d\u306e\u6b63\u4f53\u3092\u3001\u7d19\u306e\u4e0a\u3067\u5bfe\u5fdc\u3055\u305b\u308b\u306e\u3067\u3059\u3002<\/p>\n<h5>\u624b\u98063\uff1a\u30e1\u30e2\u3092\u898b\u306a\u304c\u3089\u3001SQL\u6587\u3092\u7ffb\u8a33\u3057\u3066\u3044\u304f<\/h5>\n<p>\u4f5c\u6210\u3057\u305f\u30e1\u30e2\u3092\u30b3\u30f3\u30d1\u30b9\u306b\u3057\u3066\u3001SQL\u6587\u306e\u4ed6\u306e\u90e8\u5206\u3092\u8aad\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li><code>WHERE T1.\u5546\u54c1\u30b3\u30fc\u30c9 = T2.\u5546\u54c1\u30b3\u30fc\u30c9<\/code><br \/>\n    \u2192\uff08\u30e1\u30e2\u3092\u898b\u3066\uff09\u300c\u3042\u3042\u3001<strong>\u5546\u54c1\u30de\u30b9\u30bf\u306e<\/strong>\u5546\u54c1\u30b3\u30fc\u30c9\u3068\u3001<strong>\u58f2\u4e0a\u660e\u7d30\u306e<\/strong>\u5546\u54c1\u30b3\u30fc\u30c9\u3092\u7d10\u3065\u3051\u3066\u3044\u308b\u3093\u3060\u306a\u300d<\/li>\n<li><code>AND T1.\u5546\u54c1\u540d = '\u3048\u3093\u3074\u3064'<\/code><br \/>\n    \u2192\uff08\u30e1\u30e2\u3092\u898b\u3066\uff09\u300c\u305d\u3057\u3066\u3001<strong>\u5546\u54c1\u30de\u30b9\u30bf\u306e<\/strong>\u5546\u54c1\u540d\u304c&#8217;\u3048\u3093\u3074\u3064&#8217;\u306e\u3082\u306e\u3092\u63a2\u3057\u3066\u3044\u308b\u3093\u3060\u306a\u300d<\/li>\n<li><code>SELECT T2.\u58f2\u4e0a\u65e5, T2.\u6570\u91cf<\/code><br \/>\n    \u2192\uff08\u30e1\u30e2\u3092\u898b\u3066\uff09\u300c\u6700\u7d42\u7684\u306b\u8868\u793a\u3059\u308b\u306e\u306f\u3001<strong>\u58f2\u4e0a\u660e\u7d30\u306e<\/strong>\u58f2\u4e0a\u65e5\u3068\u6570\u91cf\u306a\u3093\u3060\u306a\u300d<\/li>\n<\/ul>\n<h5>\u7d50\u8ad6<\/h5>\n<p>\u3069\u3046\u3067\u3057\u3087\u3046\u304b\u3002\u4e00\u624b\u9593\u52a0\u3048\u308b\u3060\u3051\u3067\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u6697\u53f7\u3067\u306f\u306a\u304f\u3001\u5358\u306a\u308b\u4fbf\u5229\u306a\u7565\u8a18\u53f7\u306b\u898b\u3048\u3066\u304d\u307e\u305b\u3093\u304b\uff1f<br \/>\n\u8907\u96d1\u306aSQL\u6587\u307b\u3069\u3001\u3053\u306e<strong>\u300c\u6700\u521d\u306bFROM\u53e5\u3092\u898b\u3066\u30e1\u30e2\u3092\u53d6\u308b\u300d<\/strong>\u3068\u3044\u3046\u51b7\u9759\u306a\u521d\u52d5\u304c\u3001\u6b63\u89e3\u3078\u306e\u9053\u3092\u5927\u304d\u304f\u5207\u308a\u62d3\u3044\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<h3>\u30106. \u672a\u6765\u3092\u4e88\u6e2c\u3059\u308b\u51fa\u984c\u4e88\u60f3\u3011<\/h3>\n<p>\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u57fa\u672c\u3068\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u305f\u4eca\u3001\u6b21\u306a\u308b\u30b9\u30c6\u30c3\u30d7\u306b\u9032\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u3053\u3067\u306f\u3001\u5fdc\u7528\u60c5\u5831\u30fb\u9ad8\u5ea6\u8a66\u9a13\u3067\u4eca\u5f8c\u3082\u51fa\u984c\u304c\u4e88\u60f3\u3055\u308c\u308b\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u5fdc\u7528\u3057\u305f\u91cd\u8981\u306a\u69cb\u6587\u30922\u3064\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h4>\u4e88\u60f31\uff1a\u76f8\u95a2\u526f\u554f\u5408\u305b\uff08\u305d\u3046\u304b\u3093\u3075\u304f\u3082\u3093\u3042\u308f\u305b\uff09<\/h4>\n<p>\u3053\u308c\u306f\u3001\u591a\u304f\u306e\u53d7\u9a13\u8005\u304c\u82e6\u624b\u3068\u3059\u308b\u96e3\u95a2\u30c8\u30d4\u30c3\u30af\u3067\u3059\u304c\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306e<strong>\u30b9\u30b3\u30fc\u30d7\uff08\u6709\u52b9\u7bc4\u56f2\uff09<\/strong>\u3092\u7406\u89e3\u3057\u3066\u3044\u308b\u304b\u304c\u76f4\u63a5\u554f\u308f\u308c\u308b\u305f\u3081\u3001\u51fa\u984c\u8005\u3068\u3057\u3066\u306f\u683c\u597d\u306e\u30c6\u30fc\u30de\u3067\u3059\u3002<\/p>\n<p>\u76f8\u95a2\u526f\u554f\u5408\u305b\u3068\u306f\u3001\u526f\u554f\u5408\u305b\uff08\u5185\u5074\u306eSELECT\u6587\uff09\u304c\u3001\u4e3b\u554f\u5408\u305b\uff08\u5916\u5074\u306eSELECT\u6587\uff09\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u53c2\u7167\u3059\u308b\u3088\u3046\u306a\u3001\u5165\u308c\u5b50\u69cb\u9020\u306e\u30af\u30a8\u30ea\u3067\u3059\u3002<\/p>\n<p><strong>\u6982\u5ff5\u7684\u306a\u4f8b\uff1a<\/strong><\/p>\n<pre><code>SELECT\n    E1.\u793e\u54e1\u540d, E1.\u7d66\u4e0e\nFROM\n    \u793e\u54e1\u30de\u30b9\u30bf E1  -- \u2190 \u5916\u5074\u3067\u300cE1\u300d\u3092\u5b9a\u7fa9\nWHERE\n    E1.\u7d66\u4e0e > (\n        SELECT AVG(E2.\u7d66\u4e0e) FROM \u793e\u54e1\u30de\u30b9\u30bf E2 WHERE E2.\u6240\u5c5e\u90e8\u9580\u30b3\u30fc\u30c9 = <strong>E1.\u6240\u5c5e\u90e8\u9580\u30b3\u30fc\u30c9<\/strong> -- \u2190 \u5185\u5074\u3067\u5916\u306e\u300cE1\u300d\u3092\u53c2\u7167\n    );\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u300c\u81ea\u8eab\u306e\u6240\u5c5e\u90e8\u9580\u306e\u5e73\u5747\u7d66\u4e0e\u3088\u308a\u3082\u591a\u304f\u306e\u7d66\u4e0e\u3092\u3082\u3089\u3063\u3066\u3044\u308b\u793e\u54e1\u300d\u3092\u691c\u7d22\u3057\u3066\u3044\u307e\u3059\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u526f\u554f\u5408\u305b\u306e\u4e2d\u3067\u4e3b\u554f\u5408\u305b\u306e\u30a8\u30a4\u30ea\u30a2\u30b9<code>E1<\/code>\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u70b9\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u69cb\u6587\u3092\u898b\u3066\u3082\u3001\u300c\u6307\u5dee\u3057\u78ba\u8a8d\u30e1\u30e2\u300d\u3055\u3048\u4f5c\u3063\u3066\u304a\u3051\u3070\u3001<code>E1<\/code>\u304c\u4f55\u3092\u6307\u3057\u3066\u3044\u308b\u304b\u8ff7\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h4>\u4e88\u60f32\uff1aWITH\u53e5\uff08\u5171\u901a\u30c6\u30fc\u30d6\u30eb\u5f0f\uff09<\/h4>\n<p><code>WITH<\/code>\u53e5\u306f\u3001\u9577\u3044SQL\u6587\u3092\u5206\u5272\u3057\u3066\u898b\u901a\u3057\u3092\u826f\u304f\u3059\u308b\u305f\u3081\u306e\u6a5f\u80fd\u3067\u3001\u8fd1\u5e74\u306e\u5b9f\u52d9\u3067\u3082\u975e\u5e38\u306b\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u8a66\u9a13\u554f\u984c\u3067\u3082\u53ef\u8aad\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3068\u3057\u3066\u767b\u5834\u3059\u308b\u53ef\u80fd\u6027\u304c\u9ad8\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><code>WITH<\/code>\u53e5\u3092\u4f7f\u3046\u3068\u3001SELECT\u6587\u306e\u5b9f\u884c\u7d50\u679c\u306b\u540d\u524d\uff08\u30a8\u30a4\u30ea\u30a2\u30b9\uff09\u3092\u4ed8\u3051\u3001\u305d\u308c\u3092<strong>\u4e00\u6642\u7684\u306a\u4eee\u60f3\u30c6\u30fc\u30d6\u30eb<\/strong>\u3068\u3057\u3066\u5f8c\u306eSELECT\u6587\u3067\u518d\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u6982\u5ff5\u7684\u306a\u4f8b\uff1a<\/strong><\/p>\n<pre><code>-- \u300c\u95a2\u6771\u652f\u793e\u300d\u3068\u3044\u3046\u540d\u524d\u3067\u3001\u95a2\u6771\u306e\u652f\u793e\u60c5\u5831\u3092\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u3068\u3057\u3066\u5b9a\u7fa9\nWITH \u95a2\u6771\u652f\u793e AS (\n    SELECT \u652f\u793e\u30b3\u30fc\u30c9, \u652f\u793e\u540d FROM \u652f\u793e\u30de\u30b9\u30bf WHERE \u6240\u5728\u5730 = '\u95a2\u6771'\n)\n-- \u4e0a\u3067\u5b9a\u7fa9\u3057\u305f\u300c\u95a2\u6771\u652f\u793e\u300d\u3068\u793e\u54e1\u30de\u30b9\u30bf\u3092\u7d50\u5408\u3059\u308b\nSELECT\n    S.\u793e\u54e1\u540d, K.\u652f\u793e\u540d\nFROM\n    \u793e\u54e1\u30de\u30b9\u30bf S\nJOIN\n    \u95a2\u6771\u652f\u793e K ON S.\u6240\u5c5e\u652f\u793e\u30b3\u30fc\u30c9 = K.\u652f\u793e\u30b3\u30fc\u30c9;\n<\/code><\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u8907\u96d1\u306a\u51e6\u7406\u3092\u90e8\u54c1\u5316\u3057\u3066\u540d\u524d\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067\u3001SQL\u6587\u5168\u4f53\u304c\u975e\u5e38\u306b\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<code>WITH<\/code>\u53e5\u3067\u4f7f\u308f\u308c\u308b<code>\u95a2\u6771\u652f\u793e<\/code>\u3084<code>K<\/code>\u3082\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u4e00\u7a2e\u3068\u6349\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30107. \u77e5\u8b58\u3092\u4f53\u7cfb\u5316\u3059\u308b\u95a2\u9023\u30de\u30c3\u30d7\u3011<\/h3>\n<p>\u6700\u5f8c\u306b\u3001\u3053\u308c\u307e\u3067\u5b66\u3093\u3060\u77e5\u8b58\u3092\u6574\u7406\u3057\u3001\u8a18\u61b6\u306b\u5b9a\u7740\u3055\u305b\u308b\u305f\u3081\u306e\u300c\u95a2\u9023\u30de\u30c3\u30d7\u300d\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u554f\u984c\u3092\u89e3\u304f\u4e0a\u3067\u3044\u304b\u306b\u4e2d\u5fc3\u7684\u3067\u3001\u69d8\u3005\u306a\u77e5\u8b58\u3068\u7d50\u3073\u3064\u3044\u3066\u3044\u308b\u304b\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<div class=\"concept-map\">\n<ul>\n<li><strong>\u3010\u4e2d\u5fc3\u3011SQL\u30a8\u30a4\u30ea\u30a2\u30b9\uff08\u3042\u3060\u540d\uff09<\/strong>\n<ul>\n<li><strong>JOIN (\u30c6\u30fc\u30d6\u30eb\u7d50\u5408)<\/strong>\n<ul>\n<li>\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u4ed8\u3051\u305f\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4f7f\u3044\u3001<code>T1.ID = T2.ID<\/code> \u306e\u3088\u3046\u306b\u3001\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u3069\u306e\u5217\u304b\u3092\u660e\u78ba\u306b\u3057\u3066\u7d50\u5408\u6761\u4ef6\u3092\u8a18\u8ff0\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u81ea\u5df1\u7d50\u5408 (Self Join)<\/strong>\n<ul>\n<li>\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u3092\u5f79\u5272\u306e\u9055\u30462\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u898b\u306a\u3057\u3001\u305d\u308c\u305e\u308c\u306b<code>EMP<\/code>\u3068<code>MGR<\/code>\u306e\u3088\u3046\u306a\u7570\u306a\u308b\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u3066\u533a\u5225\u3059\u308b\u3002\u30a8\u30a4\u30ea\u30a2\u30b9\u304c<strong>\u5fc5\u9808<\/strong>\u306e\u5834\u9762\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u96c6\u7d04\u95a2\u6570\u3068GROUP BY<\/strong>\n<ul>\n<li><code>SUM(\u6570\u91cf)<\/code>\u306e\u3088\u3046\u306a\u8a08\u7b97\u7d50\u679c\u306b\u3001<code>AS \"\u5408\u8a08\u6570\u91cf\"<\/code> \u306e\u3088\u3046\u306b\u5206\u304b\u308a\u3084\u3059\u3044<strong>\u5217\u30a8\u30a4\u30ea\u30a2\u30b9<\/strong>\u3092\u4ed8\u3051\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u526f\u554f\u5408\u305b (Subquery)<\/strong>\n<ul>\n<li>\u7279\u306b\u3001\u5916\u5074\u306e\u30af\u30a8\u30ea\u3067\u5b9a\u7fa9\u3057\u305f\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u5185\u5074\u306e\u30af\u30a8\u30ea\u304c\u53c2\u7167\u3059\u308b<strong>\u76f8\u95a2\u526f\u554f\u5408\u305b<\/strong>\u3067\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\uff08\u6709\u52b9\u7bc4\u56f2\uff09\u306e\u7406\u89e3\u304c\u554f\u308f\u308c\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>WITH\u53e5 (\u5171\u901a\u30c6\u30fc\u30d6\u30eb\u5f0f)<\/strong>\n<ul>\n<li>\u30af\u30a8\u30ea\u306e\u90e8\u54c1\uff08SELECT\u6587\uff09\u306b\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u3066\u4eee\u60f3\u30c6\u30fc\u30d6\u30eb\u5316\u3057\u3001\u5f8c\u306e\u51e6\u7406\u3067\u30b7\u30f3\u30d7\u30eb\u306b\u53c2\u7167\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u5358\u72ec\u306e\u6a5f\u80fd\u3067\u306f\u306a\u304f\u3001SQL\u306e\u69d8\u3005\u306a\u91cd\u8981\u30c6\u30af\u30cb\u30c3\u30af\u3092\u652f\u3048\u308b<strong>\u7e01\u306e\u4e0b\u306e\u529b\u6301\u3061<\/strong>\u306a\u306e\u3067\u3059\u3002\u3053\u306e\u7e4b\u304c\u308a\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u65ad\u7247\u7684\u306a\u77e5\u8b58\u304c\u6574\u7406\u3055\u308c\u3001\u5fdc\u7528\u529b\u304c\u683c\u6bb5\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30108. \u3042\u306a\u305f\u3060\u3051\u306e\u5b66\u7fd2\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\u3011<\/h3>\n<p>\u30a8\u30a4\u30ea\u30a2\u30b9\u3068\u3044\u3046\u6b66\u5668\u306e\u5f37\u529b\u3055\u3068\u305d\u306e\u4f7f\u3044\u65b9\u304c\u5206\u304b\u3063\u305f\u3089\u3001\u3042\u3068\u306f\u53cd\u5fa9\u7df4\u7fd2\u3042\u308b\u306e\u307f\u3067\u3059\u3002\u4ee5\u4e0b\u306e4\u3064\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u3001\u7121\u7406\u306a\u304f\u30b9\u30ad\u30eb\u3092\u5b9a\u7740\u3055\u305b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"roadmap\">\n<h4>Step 1\uff1a\u5217\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u6163\u308c\u308b<\/h4>\n<p>\u307e\u305a\u306f\u7c21\u5358\u306a<code>SELECT<\/code>\u6587\u304b\u3089\u59cb\u3081\u307e\u3059\u3002\u624b\u6301\u3061\u306e\u554f\u984c\u96c6\u3084Web\u4e0a\u306e\u5b66\u7fd2\u30b5\u30a4\u30c8\u3067\u3001\u96c6\u7d04\u95a2\u6570\uff08<code>SUM<\/code>, <code>AVG<\/code>\u306a\u3069\uff09\u3092\u4f7f\u3063\u305fSQL\u3092\u63a2\u3057\u3001\u305d\u306e\u7d50\u679c\u306b<code>AS \"\u5408\u8a08\"<\/code>\u306e\u3088\u3046\u306a\u5206\u304b\u308a\u3084\u3059\u3044\u65e5\u672c\u8a9e\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4ed8\u3051\u308b\u7df4\u7fd2\u3092\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306f\u30a6\u30a9\u30fc\u30df\u30f3\u30b0\u30a2\u30c3\u30d7\u3067\u3059\u3002<\/p>\n<h4>Step 2\uff1a\u57fa\u672c\u7684\u306a\u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b<\/h4>\n<p>\u6b21\u306b\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u5185\u90e8\u7d50\u5408\uff08<code>INNER JOIN<\/code>\uff09\u3059\u308b\u554f\u984c\u3067\u3001\u30c6\u30fc\u30d6\u30eb\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u307e\u3059\u3002\u3053\u306e\u6bb5\u968e\u3067\u3001\u30bb\u30af\u30b7\u30e7\u30f35\u3067\u7d39\u4ecb\u3057\u305f<strong>\u300c\u6307\u5dee\u3057\u78ba\u8a8d\u30e1\u30e2\u300d<\/strong>\u3092\u5fc5\u305a\u5b9f\u8df5\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u4e00\u624b\u9593\u3092\u7fd2\u6163\u5316\u3059\u308b\u3053\u3068\u304c\u3001\u5f8c\u306e\u5fdc\u7528\u554f\u984c\u3067\u5927\u304d\u306a\u529b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>Step 3\uff1a\u30a8\u30a4\u30ea\u30a2\u30b9\u306e\u5a01\u529b\u3092\u4f53\u611f\u3059\u308b<\/h4>\n<p>3\u3064\u4ee5\u4e0a\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u8907\u96d1\u306a\u554f\u984c\u3084\u3001\u300c\u793e\u54e1\u3068\u4e0a\u53f8\u300d\u306e\u3088\u3046\u306b\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b<strong>\u81ea\u5df1\u7d50\u5408<\/strong>\u306e\u554f\u984c\u306b\u6311\u6226\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u300c\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u306a\u3044\u3068\u3001\u3053\u3093\u306a\u306b\u3082\u8aad\u307f\u306b\u304f\u3044\u306e\u304b\uff01\u300d\u300c\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u5fc5\u9808\u306a\u3093\u3060\u306a\u300d\u3068\u3001\u305d\u306e\u3042\u308a\u304c\u305f\u307f\u3092\u4f53\u611f\u3067\u304d\u308c\u3070\u3001\u3053\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u30af\u30ea\u30a2\u3067\u3059\u3002<\/p>\n<h4>Step 4\uff1a\u96e3\u95a2\u554f\u984c\u306b\u6311\u6226\u3057\u3001\u601d\u8003\u6cd5\u3092\u78ba\u7acb\u3059\u308b<\/h4>\n<p>\u6700\u5f8c\u306b\u3001<strong>\u76f8\u95a2\u526f\u554f\u5408\u305b<\/strong>\u3092\u542b\u3080\u5fdc\u7528\u60c5\u5831\u30fb\u9ad8\u5ea6\u8a66\u9a13\u306e\u904e\u53bb\u554f\u306b\u6311\u6226\u3057\u307e\u3059\u3002\u3053\u3053\u304c\u6700\u7d42\u95a2\u9580\u3067\u3059\u3002\u6700\u521d\u306f\u89e3\u3051\u306a\u304f\u3066\u3082\u5168\u304f\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u89e3\u8aac\u3092\u8aad\u307f\u306a\u304c\u3089\u3067\u3082\u826f\u3044\u306e\u3067\u3001\u300c\u5916\u5074\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u3001\u3069\u3046\u5185\u5074\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u304b\u300d\u3068\u3044\u3046\u30b9\u30b3\u30fc\u30d7\u306e\u6d41\u308c\u3092\u3001\u81ea\u5206\u306e\u529b\u3067\u30c8\u30ec\u30fc\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3053\u3068\u3092\u76ee\u6307\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u304c\u3067\u304d\u308c\u3070\u3001\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u5b8c\u5168\u306b\u3042\u306a\u305f\u306e\u6b66\u5668\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n<h3>\u30109. \u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af\uff06\u30c1\u30e3\u30ec\u30f3\u30b8\u30af\u30a4\u30ba\u3011<\/h3>\n<p>\u77e5\u8b58\u304c\u672c\u5f53\u306b\u8eab\u306b\u3064\u3044\u305f\u304b\u3001\u3053\u3053\u3067\u8155\u8a66\u3057\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u307e\u305a\u306f\u7c21\u5358\u306a\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u304b\u3089\u3001\u6b21\u306b\u5fdc\u7528\u30af\u30a4\u30ba\u306b\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h4>\u7406\u89e3\u5ea6\u30c1\u30a7\u30c3\u30af<\/h4>\n<p>\u4ee5\u4e0b\u306e\u8cea\u554f\u306b\u3001\u81ea\u5206\u306e\u8a00\u8449\u3067\u30b9\u30e9\u30b9\u30e9\u7b54\u3048\u3089\u308c\u307e\u3059\u304b\uff1f<\/p>\n<ul>\n<li><strong>\u8cea\u554f1\uff1a<\/strong>SQL\u3067\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u4f7f\u3046\u4e3b\u306a\u7406\u7531\u30923\u3064\u6319\u3052\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li><strong>\u8cea\u554f2\uff1a<\/strong>SQL\u30a8\u30f3\u30b8\u30f3\u304c\u30af\u30a8\u30ea\u3092\u8a55\u4fa1\u3059\u308b\u9806\u756a\u3067\u3001<code>SELECT<\/code>\u53e5\u3068<code>FROM<\/code>\u53e5\u306f\u3069\u3061\u3089\u304c\u5148\u3067\u3059\u304b\uff1f<\/li>\n<li><strong>\u8cea\u554f3\uff1a<\/strong>\u8907\u96d1\u306aSQL\u6587\u3067\u30a8\u30a4\u30ea\u30a2\u30b9\u304c\u51fa\u3066\u304d\u305f\u3068\u304d\u3001\u6df7\u4e71\u3057\u306a\u3044\u305f\u3081\u306b\u6700\u521d\u306b\u3059\u3079\u304d\u300c\u4e00\u624b\u9593\u300d\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/li>\n<\/ul>\n<p>\uff08\u7b54\u3048\u306f\u3001\u3053\u306e\u8a18\u4e8b\u306e\u30bb\u30af\u30b7\u30e7\u30f34\u30685\u3092\u8aad\u307f\u8fd4\u305b\u3070\u5206\u304b\u308a\u307e\u3059\u306d\uff01\uff09<\/p>\n<hr>\n<h4>\u30c1\u30e3\u30ec\u30f3\u30b8\u30af\u30a4\u30ba<\/h4>\n<p>3\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u3001\u5c11\u3057\u5fdc\u7528\u7684\u306a\u554f\u984c\u3067\u3059\u3002<\/p>\n<p><strong>\u3010\u554f\u984c\u3011<\/strong><br \/>\n\u4ee5\u4e0b\u306e\u300c\u793e\u54e1\u300d\u300c\u90e8\u7f72\u300d\u300c\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0\u300d\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u300c\u958b\u767a\u90e8\u300d\u306b\u6240\u5c5e\u3057\u3001\u300cPhoenix\u300d\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u53c2\u52a0\u3057\u3066\u3044\u308b\u793e\u54e1\u306e\u300c\u793e\u54e1\u540d\u300d\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\u305f\u3081\u306eSQL\u6587\u306b\u3064\u3044\u3066\u3001[ \u30a2 ]\uff5e[ \u30a8 ]\u306b\u5165\u308b\u9069\u5207\u306a\u5b57\u53e5\u3092\u7b54\u3048\u306a\u3055\u3044\u3002<\/p>\n<p><strong>\u8868\uff1a\u793e\u54e1<\/strong><\/p>\n<table class=\"table-design\">\n<thead>\n<tr>\n<th>\u793e\u54e1\u756a\u53f7<\/th>\n<th>\u793e\u54e1\u540d<\/th>\n<th>\u90e8\u7f72\u30b3\u30fc\u30c9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>E01<\/td>\n<td>\u5c71\u7530<\/td>\n<td>D01<\/td>\n<\/tr>\n<tr>\n<td>E02<\/td>\n<td>\u9234\u6728<\/td>\n<td>D02<\/td>\n<\/tr>\n<tr>\n<td>E03<\/td>\n<td>\u4f50\u85e4<\/td>\n<td>D01<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u8868\uff1a\u90e8\u7f72<\/strong><\/p>\n<table class=\"table-design\">\n<thead>\n<tr>\n<th>\u90e8\u7f72\u30b3\u30fc\u30c9<\/th>\n<th>\u90e8\u7f72\u540d<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D01<\/td>\n<td>\u958b\u767a\u90e8<\/td>\n<\/tr>\n<tr>\n<td>D02<\/td>\n<td>\u55b6\u696d\u90e8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u8868\uff1a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0<\/strong><\/p>\n<table class=\"table-design\">\n<thead>\n<tr>\n<th>\u793e\u54e1\u756a\u53f7<\/th>\n<th>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u540d<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>E01<\/td>\n<td>Phoenix<\/td>\n<\/tr>\n<tr>\n<td>E02<\/td>\n<td>Dragon<\/td>\n<\/tr>\n<tr>\n<td>E03<\/td>\n<td>Phoenix<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u3010SQL\u6587\u3011<\/strong><\/p>\n<pre><code>SELECT\n    [ \u30a2 ].\u793e\u54e1\u540d\nFROM\n    \u793e\u54e1 E, \u90e8\u7f72 D, \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0 P\nWHERE\n    E.\u90e8\u7f72\u30b3\u30fc\u30c9 = [ \u30a4 ].\u90e8\u7f72\u30b3\u30fc\u30c9\n    AND E.\u793e\u54e1\u756a\u53f7 = [ \u30a6 ].\u793e\u54e1\u756a\u53f7\n    AND D.\u90e8\u7f72\u540d = '\u958b\u767a\u90e8'\n    AND [ \u30a8 ].\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u540d = 'Phoenix'\n<\/code><\/pre>\n<details>\n<summary><strong>\u89e3\u7b54\u3068\u89e3\u8aac\u3092\u898b\u308b<\/strong><\/summary>\n<div class=\"answer-box\">\n<p><strong>\u89e3\u7b54\uff1a<\/strong><\/p>\n<ul>\n<li>\u30a2\uff1a E<\/li>\n<li>\u30a4\uff1a D<\/li>\n<li>\u30a6\uff1a P<\/li>\n<li>\u30a8\uff1a P<\/li>\n<\/ul>\n<p><strong>\u89e3\u8aac\uff1a<\/strong><br \/>\n\u307e\u305a\u3001FROM\u53e5\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30a8\u30a4\u30ea\u30a2\u30b9\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u300cE = \u793e\u54e1\u300d\u300cD = \u90e8\u7f72\u300d\u300cP = \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0\u300d\u3067\u3059\u306d\u3002<br \/>\n&#8211; SELECT\u53e5\u3067\u53d6\u5f97\u3057\u305f\u3044\u306e\u306f\u300c\u793e\u54e1\u540d\u300d\u306a\u306e\u3067\u3001\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\uff08E\uff09\u306e\u793e\u54e1\u540d\u3001\u3064\u307e\u308a<code>E.\u793e\u54e1\u540d<\/code>\u3068\u306a\u308a\u307e\u3059\u3002[ \u30a2 ]\u306f<strong>E<\/strong>\u3067\u3059\u3002<br \/>\n&#8211; \u6700\u521d\u306eWHERE\u6761\u4ef6\u306f\u90e8\u7f72\u30b3\u30fc\u30c9\u3067\u306e\u7d50\u5408\u3067\u3059\u3002\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\uff08E\uff09\u3068\u90e8\u7f72\u30c6\u30fc\u30d6\u30eb\uff08D\uff09\u3092\u7d50\u5408\u3059\u308b\u306e\u3067\u3001<code>E.\u90e8\u7f72\u30b3\u30fc\u30c9 = D.\u90e8\u7f72\u30b3\u30fc\u30c9<\/code>\u3068\u306a\u308a\u307e\u3059\u3002[ \u30a4 ]\u306f<strong>D<\/strong>\u3067\u3059\u3002<br \/>\n&#8211; \u6b21\u306eWHERE\u6761\u4ef6\u306f\u793e\u54e1\u756a\u53f7\u3067\u306e\u7d50\u5408\u3067\u3059\u3002\u793e\u54e1\u30c6\u30fc\u30d6\u30eb\uff08E\uff09\u3068\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0\u30c6\u30fc\u30d6\u30eb\uff08P\uff09\u3092\u7d50\u5408\u3059\u308b\u306e\u3067\u3001<code>E.\u793e\u54e1\u756a\u53f7 = P.\u793e\u54e1\u756a\u53f7<\/code>\u3068\u306a\u308a\u307e\u3059\u3002[ \u30a6 ]\u306f<strong>P<\/strong>\u3067\u3059\u3002<br \/>\n&#8211; \u6700\u5f8c\u306e\u6761\u4ef6\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u540d\u3067\u306e\u7d5e\u308a\u8fbc\u307f\u3067\u3059\u3002\u3053\u308c\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u53c2\u52a0\u30c6\u30fc\u30d6\u30eb\uff08P\uff09\u306e\u5217\u306a\u306e\u3067\u3001<code>P.\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u540d<\/code>\u3068\u306a\u308a\u307e\u3059\u3002[ \u30a8 ]\u306f<strong>P<\/strong>\u3067\u3059\u3002<\/p>\n<p>\u300c\u6307\u5dee\u3057\u78ba\u8a8d\u30e1\u30e2\u300d\u3055\u3048\u4f5c\u308c\u3070\u3001\u843d\u3061\u7740\u3044\u3066\u89e3\u3051\u308b\u554f\u984c\u3067\u3059\u306d\uff01<\/p>\n<\/div>\n<\/details>\n<h3>\u301010. \u6700\u7d42\u30c1\u30a7\u30c3\u30af\u3068\u307e\u3068\u3081\u3011<\/h3>\n<p>\u3053\u3053\u307e\u3067\u672c\u5f53\u306b\u304a\u75b2\u308c\u69d8\u3067\u3057\u305f\u3002\u3042\u306a\u305f\u306f\u3082\u3046\u3001SQL\u306e\u30a8\u30a4\u30ea\u30a2\u30b9\u306b\u6238\u60d1\u3046\u3053\u3068\u306f\u306a\u3044\u306f\u305a\u3067\u3059\u3002\u6700\u5f8c\u306b\u3001\u3053\u306e\u8a18\u4e8b\u306e\u6700\u3082\u91cd\u8981\u306a\u30a8\u30c3\u30bb\u30f3\u30b9\u3092\u632f\u308a\u8fd4\u308a\u3001\u3042\u306a\u305f\u306e\u77e5\u8b58\u3092\u78ba\u304b\u306a\u81ea\u4fe1\u3078\u3068\u5909\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30a8\u30a4\u30ea\u30a2\u30b9\u306f\u3001\u3042\u306a\u305f\u3092\u6df7\u4e71\u3055\u305b\u308b\u305f\u3081\u306e\u6697\u53f7\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3080\u3057\u308d\u3001\u8907\u96d1\u306a\u30af\u30a8\u30ea\u3092\u8aad\u307f\u89e3\u304f\u305f\u3081\u306e<strong>\u6700\u9ad8\u306e\u300c\u76f8\u68d2\u300d<\/strong>\u3067\u3059\u3002\u305d\u306e\u76f8\u68d2\u3068\u4ef2\u826f\u304f\u3059\u308b\u305f\u3081\u306e\u79d8\u8a23\u306f\u3001\u305f\u3063\u305f2\u3064\u306e\u7fd2\u6163\u3092\u8eab\u306b\u3064\u3051\u308b\u3053\u3068\u3067\u3057\u305f\u3002<\/p>\n<div 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