{"id":1612,"date":"2026-03-24T07:39:44","date_gmt":"2026-03-24T07:39:44","guid":{"rendered":"https:\/\/www.viz-read.com\/ja\/why-your-erd-fails-poor-design-patterns\/"},"modified":"2026-03-24T07:39:44","modified_gmt":"2026-03-24T07:39:44","slug":"why-your-erd-fails-poor-design-patterns","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/ja\/why-your-erd-fails-poor-design-patterns\/","title":{"rendered":"\u3042\u306a\u305f\u306eERD\u304c\u5931\u6557\u3059\u308b\u7406\u7531\uff1a\u60aa\u3044\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3\u306e\u6df1\u6398\u308a"},"content":{"rendered":"

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\n
\"Charcoal<\/figure>\n<\/div>\n

1. \u95a2\u4fc2\u6027\u306e\u66d6\u6627\u3055 \ud83e\udd14<\/h2>\n

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\u6697\u9ed9\u7684\u95a2\u4fc2\u3068\u660e\u793a\u7684\u95a2\u4fc2<\/h3>\n

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    \n
  • \u660e\u793a\u7684\uff1a<\/strong> \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306b\u3088\u3063\u3066\u5f37\u5236\u3055\u308c\u308b\u3002\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001\u5f93\u5c5e\u30ec\u30b3\u30fc\u30c9\u306f\u5b9a\u7fa9\u3055\u308c\u305f\u30eb\u30fc\u30eb\uff08CASCADE\u3001SET NULL\uff09\u306b\u5f93\u3063\u3066\u51e6\u7406\u3055\u308c\u308b\u3002<\/li>\n
  • \u6697\u9ed9\u7684\uff1a<\/strong> \u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u5f37\u5236\u3055\u308c\u308b\u3002\u30b3\u30fc\u30c9\u304c\u5931\u6557\u3057\u305f\u308a\u3001\u30d0\u30a4\u30d1\u30b9\u3055\u308c\u305f\u308a\u3059\u308b\u3068\u3001\u5b64\u7acb\u3057\u305f\u30c7\u30fc\u30bf\u304c\u6b8b\u308b\u3002<\/li>\n<\/ul>\n

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    \u57fa\u6570\u30e9\u30d9\u30eb\u306e\u6b20\u5982<\/h3>\n

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      \n
    • \u30af\u30a8\u30ea\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u304c\u82e6\u6226\u3059\u308b\uff1a<\/strong> \u30b7\u30b9\u30c6\u30e0\u306f\u7d50\u5408\u6226\u7565\u3092\u52b9\u679c\u7684\u306b\u6c7a\u5b9a\u3067\u304d\u306a\u3044\u3002<\/li>\n
    • \u30c7\u30fc\u30bf\u691c\u8a3c\u304c\u5931\u6557\u3059\u308b\uff1a<\/strong> \u4f8b\u3048\u3070 NOT NULL<\/em> \u3068\u3044\u3063\u305f\u5236\u7d04\u304c\u8aa4\u3063\u3066\u9069\u7528\u3055\u308c\u308b\u3002<\/li>\n
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      2. \u57fa\u6570\u306e\u6df7\u4e71\uff1a1\u5bfe\u591a\u306e\u7f60 \ud83d\udcc9<\/h2>\n

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      1:1\u95a2\u4fc2\u3068\u5197\u9577\u6027<\/h3>\n

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      \u88fd\u54c1\u3068\u4fa1\u683c\u5c65\u6b74<\/td>\n\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u542b\u30801\u3064\u306e\u30c6\u30fc\u30d6\u30eb<\/td>\n1:1\u3067\u30ea\u30f3\u30af\u3055\u308c\u305f2\u3064\u306e\u30c6\u30fc\u30d6\u30eb<\/td>\n<\/tr>\n<\/table>\n

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      1:N\u95a2\u4fc2\u3068\u5916\u90e8\u30ad\u30fc<\/h3>\n

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        \n
      • \u6b63\u3057\u3044\uff1a<\/strong> \u6ce8\u6587<\/code> \u30c6\u30fc\u30d6\u30eb\u306b\u306f \u30e6\u30fc\u30b6\u30fcID<\/code>.<\/li>\n
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        \u591a\u5bfe\u591a\u3068\u95a2\u9023\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/h3>\n

        \u591a\u5bfe\u591a\u95a2\u4fc2\u306f\u3001\u3069\u3061\u3089\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u3082\u5358\u4e00\u306e\u5916\u90e8\u30ad\u30fc\u3067\u306f\u8868\u73fe\u3067\u304d\u306a\u3044\u3002\u95a2\u9023\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff08\u30d6\u30ea\u30c3\u30b8\u30c6\u30fc\u30d6\u30eb\uff09\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002<\/p>\n

        \u4e00\u822c\u7684\u306a\u5931\u6557\uff1a<\/strong>\u30d6\u30ea\u30c3\u30b8\u30c6\u30fc\u30d6\u30eb\u3092\u7121\u8996\u3057\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u76f4\u63a5\u30ea\u30f3\u30af\u3057\u3088\u3046\u3068\u3059\u308b\u3002<\/p>\n

        \u306a\u305c\u5931\u6557\u3059\u308b\u306e\u304b\uff1a<\/strong> \u95a2\u4fc2\u81ea\u4f53\u306b\u5c5e\u6027\u3092\u683c\u7d0d\u3059\u308b\u80fd\u529b\u3092\u5931\u3046\u3002\u305f\u3068\u3048\u3070\u3001\u751f\u5f92<\/em> \u3068 \u6388\u696d<\/em>\u95a2\u4fc2\u306b\u306f\u30b0\u30ec\u30fc\u30c9\u304c\u5fc5\u8981\u3067\u3059\u3002\u30b0\u30ec\u30fc\u30c9\u3092Student\u30c6\u30fc\u30d6\u30eb\u307e\u305f\u306fCourse\u30c6\u30fc\u30d6\u30eb\u306e\u3069\u3061\u3089\u304b\u4e00\u65b9\u306b\u4fdd\u5b58\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n

        3. \u6b63\u898f\u5316\u3068\u975e\u6b63\u898f\u5316\u306e\u7f60 \ud83e\uddf1<\/h2>\n

        \u6b63\u898f\u5316\u306f\u30c7\u30fc\u30bf\u3092\u8ad6\u7406\u7684\u306a\u30c6\u30fc\u30d6\u30eb\u306b\u6574\u7406\u3059\u308b\u3053\u3068\u3067\u91cd\u8907\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u904e\u5270\u306a\u6b63\u898f\u5316\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4f4e\u4e0b\u3055\u305b\u307e\u3059\u3002\u975e\u6b63\u898f\u5316\u304c\u9032\u3080\u3068\u66f4\u65b0\u7570\u5e38\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u30d0\u30e9\u30f3\u30b9\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u306f\u6280\u8853\u7684\u306a\u8ab2\u984c\u3067\u3059\u3002<\/p>\n

        \u66f4\u65b0\u7570\u5e38<\/h3>\n

        \u30c7\u30fc\u30bf\u304c\u5358\u4e00\u306e\u771f\u5b9f\u306e\u30bd\u30fc\u30b9\u3092\u6301\u305f\u305a\u306b\u8907\u6570\u306e\u5834\u6240\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u3068\u3001\u66f4\u65b0\u304c\u30ea\u30b9\u30af\u3092\u4f34\u3044\u307e\u3059\u3002<\/p>\n

          \n
        • \u633f\u5165\u7570\u5e38\uff1a<\/strong>\u5fc5\u9808\u306e\u5916\u90e8\u30ad\u30fc\u304c\u6b20\u3051\u3066\u3044\u308b\u305f\u3081\u3001\u30ec\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n
        • \u66f4\u65b0\u7570\u5e38\uff1a<\/strong>\u3042\u308b\u884c\u306e\u5024\u3092\u5909\u66f4\u3057\u3066\u3082\u5225\u306e\u884c\u306f\u5909\u66f4\u3057\u306a\u3044\u3068\u3001\u30c7\u30fc\u30bf\u304c\u4e00\u8cab\u6027\u3092\u5931\u3044\u307e\u3059\u3002<\/li>\n
        • \u524a\u9664\u7570\u5e38\uff1a<\/strong>\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u969b\u306b\u3001\u305d\u306e\u4e2d\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u91cd\u8981\u306a\u60c5\u5831\u3092\u8aa4\u3063\u3066\u524a\u9664\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n

          \u975e\u6b63\u898f\u5316\u3092\u884c\u3046\u30bf\u30a4\u30df\u30f3\u30b0<\/h3>\n

          \u975e\u6b63\u898f\u5316\u306f\u8aad\u307f\u53d6\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306e\u610f\u56f3\u7684\u306a\u9078\u629e\u3067\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u72b6\u614b\u306b\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u72b6\u6cc1\u3067\u3057\u304b\u6b63\u5f53\u5316\u3067\u304d\u307e\u305b\u3093\uff1a<\/p>\n

            \n
          • \u8aad\u307f\u53d6\u308a\u983b\u5ea6<\/strong>\u66f8\u304d\u8fbc\u307f\u983b\u5ea6\u3092\u306f\u308b\u304b\u306b\u4e0a\u56de\u308b\u3002<\/li>\n
          • \u7d50\u5408\u30b3\u30b9\u30c8<\/strong>\u30c7\u30fc\u30bf\u91cf\u306e\u591a\u3055\u306b\u3088\u308a\u3001\u7d50\u5408\u30b3\u30b9\u30c8\u304c\u7121\u8996\u3067\u304d\u306a\u3044\u307b\u3069\u9ad8\u304f\u306a\u308b\u3002<\/li>\n
          • \u30ec\u30dd\u30fc\u30c8\u8981\u4ef6<\/strong>\u3042\u3089\u304b\u3058\u3081\u96c6\u8a08\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002<\/li>\n<\/ul>\n

            \u8a2d\u8a08\u8005\u306f\u3057\u3070\u3057\u3070\u975e\u6b63\u898f\u5316\u3092\u65e9\u3005\u306b\u884c\u3044\u304c\u3061\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30c7\u30fc\u30bf\u306e\u305a\u308c\u306e\u30ea\u30b9\u30af\u304c\u751f\u3058\u307e\u3059\u3002\u30bd\u30fc\u30b9\u30c7\u30fc\u30bf\u304c\u5909\u66f4\u3055\u308c\u305f\u5834\u5408\u3001\u975e\u6b63\u898f\u5316\u3055\u308c\u305f\u30b3\u30d4\u30fc\u306f\u30c8\u30ea\u30ac\u30fc\u307e\u305f\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u4ecb\u3057\u3066\u66f4\u65b0\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3001\u8907\u96d1\u6027\u3068\u6f5c\u5728\u7684\u306a\u969c\u5bb3\u30dd\u30a4\u30f3\u30c8\u304c\u5897\u52a0\u3057\u307e\u3059\u3002<\/p>\n

            4. \u540d\u524d\u4ed8\u3051\u898f\u5247\u3068\u610f\u5473\u8ad6 \ud83c\udff7\ufe0f<\/h2>\n

            \u30b9\u30ad\u30fc\u30de\u306f\u66f8\u304b\u308c\u308b\u3088\u308a\u3082\u8aad\u307e\u308c\u308b\u983b\u5ea6\u304c\u9ad8\u3044\u3067\u3059\u3002\u540d\u524d\u304c\u660e\u78ba\u3067\u306a\u3051\u308c\u3070\u3001\u958b\u767a\u8005\u306e\u8a8d\u77e5\u8ca0\u8377\u304c\u5897\u3057\u3001\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u3002\u610f\u5473\u306e\u660e\u78ba\u3055\u306f\u69cb\u9020\u7684\u6574\u5408\u6027\u3068\u540c\u3058\u304f\u3089\u3044\u91cd\u8981\u3067\u3059\u3002<\/p>\n

            \u4e00\u822c\u7684\u306a\u540d\u524d<\/h3>\n

            \u300cTable1<\/code>, Column_A<\/code>\u300d\u3084\u300cData<\/code>\u6587\u8108\u3092\u4e00\u5207\u63d0\u4f9b\u3057\u307e\u305b\u3093\u3002\u958b\u767a\u8005\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

              \n
            • \u3088\u308a\u826f\u3044\uff1a<\/strong> \u6ce8\u6587\u9805\u76ee<\/code>, \u53d6\u5f15\u65e5\u4ed8<\/code>, \u9867\u5ba2\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb<\/code>.<\/li>\n<\/ul>\n

              \u5358\u6570\u3068\u8907\u6570\u306e\u4e0d\u6574\u5408<\/h3>\n

              \u4e00\u90e8\u306e\u6a19\u6e96\u3067\u306f\u5358\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u597d\u3080\u304c\u3001\u4ed6\u306e\u6a19\u6e96\u3067\u306f\u8907\u6570\u5f62\u3092\u597d\u3080\u3002\u3053\u308c\u3089\u3092\u6df7\u5728\u3055\u305b\u308b\u3068\u6df7\u4e71\u3092\u62db\u304f\u3002<\/p>\n\n\n\n
              \u4e0d\u6574\u5408<\/strong><\/th>\n\u6574\u5408\u6027\u304c\u3042\u308b<\/strong><\/th>\n<\/tr>\n
              \u30e6\u30fc\u30b6\u30fc<\/code>, \u6ce8\u6587<\/code>, \u88fd\u54c1<\/code><\/td>\n\u30e6\u30fc\u30b6\u30fc<\/code>, \u6ce8\u6587<\/code>, \u88fd\u54c1<\/code><\/td>\n<\/tr>\n<\/table>\n

              \u6574\u5408\u6027\u304c\u3042\u308b\u3053\u3068\u3067\u3001\u4e88\u6e2c\u53ef\u80fd\u306a\u30af\u30a8\u30ea\u751f\u6210\u304c\u53ef\u80fd\u306b\u306a\u308b\u3002\u4e0d\u6574\u5408\u304c\u3042\u308b\u3068\u3001\u30b3\u30fc\u30c9\u5c64\u3067\u624b\u52d5\u3067\u30de\u30c3\u30d4\u30f3\u30b0\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/p>\n

              \u4e88\u7d04\u8a9e<\/h3>\n

              \u4ee5\u4e0b\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u7528\u3044\u308b\u5834\u5408\uff1a\u6ce8\u6587<\/code>, \u30e6\u30fc\u30b6\u30fc<\/code>\u3001\u307e\u305f\u306f\u30b0\u30eb\u30fc\u30d7<\/code>\u30c6\u30fc\u30d6\u30eb\u540d\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3068\u3001\u30af\u30a8\u30ea\u8a00\u8a9e\u3067\u69cb\u6587\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u8b58\u5225\u5b50\u306f\u3057\u3070\u3057\u3070\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u3092\u5fc5\u8981\u3068\u3057\u3001\u30af\u30a8\u30ea\u306e\u8aad\u307f\u3084\u3059\u3055\u3068\u4fdd\u5b88\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u3002<\/p>\n

              5. \u5916\u90e8\u30ad\u30fc\u306e\u7f60 \ud83d\udd11<\/h2>\n

              \u5916\u90e8\u30ad\u30fc\u306f\u95a2\u4fc2\u6027\u306e\u6574\u5408\u6027\u3092\u4fdd\u3064\u305f\u3081\u306e\u63a5\u7740\u5264\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u983b\u7e41\u306b\u8aa4\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30ad\u30fc\u306e\u5b9f\u88c5\u306b\u304a\u3051\u308b\u7d30\u90e8\u306b\u3064\u3044\u3066\u63a2\u6c42\u3057\u307e\u3059\u3002<\/p>\n

              \u81ea\u5df1\u53c2\u7167\u30ad\u30fc<\/h3>\n

              \u518d\u5e30\u7684\u95a2\u4fc2\u3001\u305f\u3068\u3048\u3070 \u5f93\u696d\u54e1<\/code> \u3092\u7ba1\u7406\u3059\u308b\u5225\u306e \u5f93\u696d\u54e1<\/code> \u306f\u3001\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u3092\u6307\u3059\u5916\u90e8\u30ad\u30fc\u3092\u5fc5\u8981\u3068\u3057\u307e\u3059\u3002\u5236\u7d04\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u7121\u9650\u30eb\u30fc\u30d7\u3084\u5b64\u7acb\u3057\u305f\u968e\u5c64\u30ce\u30fc\u30c9\u306e\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

                \n
              • \u554f\u984c\u70b9\uff1a<\/strong> \u4e0a\u53f8\u3092\u4e0b\u4f4d\u306e\u5f93\u696d\u54e1\u3092\u51e6\u7406\u305b\u305a\u306b\u524a\u9664\u3059\u308b\u3053\u3068\u3092\u8a31\u53ef\u3059\u308b\u3002<\/li>\n
              • \u89e3\u6c7a\u7b56\uff1a<\/strong> \u660e\u78ba\u306b CASCADE<\/code> \u307e\u305f\u306f SET NULL<\/code> \u5236\u7d04\u3092\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3059\u308b\u3002<\/li>\n<\/ul>\n

                \u8907\u5408\u30ad\u30fc<\/h3>\n

                \u8907\u5408\u30ad\u30fc\uff08\u8907\u6570\u306e\u5217\u304c\u4e3b\u30ad\u30fc\u3068\u3057\u3066\u6a5f\u80fd\u3059\u308b\u3082\u306e\uff09\u306f\u5f37\u529b\u3067\u3059\u304c\u3001\u58ca\u308c\u3084\u3059\u3044\u3067\u3059\u3002\u5b50\u30c6\u30fc\u30d6\u30eb\u304c\u8907\u5408\u30ad\u30fc\u3092\u53c2\u7167\u3059\u308b\u5834\u5408\u3001\u5b50\u30c6\u30fc\u30d6\u30eb\u306f\u89aa\u30ad\u30fc\u306e\u3059\u3079\u3066\u306e\u5217\u3092\u542b\u307e\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

                \u5931\u6557\u30e2\u30fc\u30c9\uff1a<\/strong> \u89aa\u30ad\u30fc\u304c\u5909\u66f4\u3055\u308c\u305f\u5834\u5408\uff08\u305f\u3068\u3048\u3070\u81ea\u7136\u30ad\u30fc\u306e\u66f4\u65b0\uff09\u3001\u5b50\u30c6\u30fc\u30d6\u30eb\u306e\u8907\u6570\u884c\u306b\u308f\u305f\u3063\u3066\u66f4\u65b0\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u308c\u306f\u9ad8\u30b3\u30b9\u30c8\u3067\u3042\u308a\u3001\u7af6\u5408\u72b6\u614b\u306e\u767a\u751f\u3057\u3084\u3059\u3044\u72b6\u614b\u3067\u3059\u3002<\/p>\n

                NULL\u8a31\u5bb9\u306e\u5916\u90e8\u30ad\u30fc<\/h3>\n

                \u5916\u90e8\u30ad\u30fc\u5217\u306f\u3001\u95a2\u4fc2\u304c\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u5834\u5408\u306b\u306e\u307fNULL\u3092\u8a31\u5bb9\u3059\u3079\u304d\u3067\u3059\u3002\u95a2\u4fc2\u304c\u5fc5\u9808\u306e\u5834\u5408\u3001\u5217\u306f NOT NULL<\/code>.<\/p>\n

                \u8b66\u544a\uff1a<\/strong> \u300c\u95a2\u4fc2\u306a\u3057\u300d\u3092\u8868\u3059\u305f\u3081\u306b NULL<\/code> \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3001SQL\u30af\u30a8\u30ea\u3092\u8907\u96d1\u306b\u3057\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30af\u30a8\u30ea\u3067 IS NULL<\/code> \u307e\u305f\u306f IS NOT NULL<\/code>\u3001\u3053\u308c\u306f\u4e00\u90e8\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u3067\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f7f\u7528\u3092\u59a8\u3052\u308b\u3002<\/p>\n

                6. \u60aa\u3044\u8a2d\u8a08\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff \ud83d\ude80<\/h2>\n

                \u4e0d\u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305fERD\u306f\u30c7\u30fc\u30bf\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3059\u3060\u3051\u3067\u306a\u304f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u3092\u3082\u305f\u3089\u3059\u3002\u7269\u7406\u7684\u306a\u30b9\u30c8\u30ec\u30fc\u30b8\u3084\u30af\u30a8\u30ea\u5b9f\u884c\u8a08\u753b\u306f\u3001\u8ad6\u7406\u30e2\u30c7\u30eb\u306e\u76f4\u63a5\u7684\u306a\u7d50\u679c\u3067\u3042\u308b\u3002<\/p>\n

                \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n

                \u5916\u90e8\u30ad\u30fc\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306f\u53c2\u7167\u6574\u5408\u6027\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u5b9f\u884c\u3059\u308b\u3002\u30c7\u30fc\u30bf\u91cf\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u3001\u3053\u306e\u64cd\u4f5c\u306f\u7d50\u5408\u3092\u8457\u3057\u304f\u9045\u304f\u3059\u308b\u3002<\/p>\n

                \u7d50\u5408\u306e\u8907\u96d1\u3055<\/h3>\n

                \u6df1\u304f\u30cd\u30b9\u30c8\u3055\u308c\u305f\u95a2\u4fc2\u6027\u306f\u8907\u6570\u306e\u7d50\u5408\u3092\u5fc5\u8981\u3068\u3059\u308b\u3002\u5404\u7d50\u5408\u306f\u8a08\u7b97\u4e0a\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u3002\u5206\u6790\u30af\u30a8\u30ea\u306b\u304a\u3044\u3066\u3001\u30d5\u30a1\u30af\u30c8\u30c6\u30fc\u30d6\u30eb\u3092\u4e2d\u5fc3\u306b\u69cb\u6210\u3055\u308c\u305f\u30b9\u30bf\u30fc\u69cb\u9020\u8a2d\u8a08\u306f\u3001\u9ad8\u5ea6\u306b\u6b63\u898f\u5316\u3055\u308c\u305f\u30b9\u30ce\u30fc\u30d5\u30ec\u30fc\u30af\u69cb\u9020\u8a2d\u8a08\u3088\u308a\u3082\u512a\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/p>\n

                \u30ed\u30c3\u30af\u7af6\u5408<\/h3>\n

                \u9ad8\u5ea6\u306b\u6b63\u898f\u5316\u3055\u308c\u305f\u8a2d\u8a08\u306f\u3001\u66f4\u65b0\u4e2d\u306b\u6574\u5408\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u591a\u304f\u306e\u30ed\u30c3\u30af\u3092\u5fc5\u8981\u3068\u3059\u308b\u3002\u9ad8\u540c\u6642\u63a5\u7d9a\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u3053\u308c\u306b\u3088\u308a\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u3084\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u304c\u767a\u751f\u3059\u308b\u3002\u308f\u305a\u304b\u306b\u975e\u6b63\u898f\u5316\u3055\u308c\u305f\u8a2d\u8a08\u306f\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3042\u305f\u308a\u306e\u30ed\u30c3\u30af\u5bfe\u8c61\u884c\u6570\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n

                7. \u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u306e\u5730\u7344 \ud83d\udee0\ufe0f<\/h2>\n

                \u60aa\u3044ERD\u306e\u771f\u306e\u30b3\u30b9\u30c8\u306f\u3001\u6642\u9593\u3068\u3068\u3082\u306b\u660e\u3089\u304b\u306b\u306a\u308b\u3002\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3053\u305d\u304c\u3001\u7406\u8ad6\u4e0a\u306e\u6b20\u9665\u304c\u5b9f\u969b\u306e\u5931\u6557\u306b\u5909\u308f\u308b\u5834\u6240\u3067\u3042\u308b\u3002<\/p>\n

                \u30b9\u30ad\u30fc\u30de\u306e\u9032\u5316<\/h3>\n

                \u8981\u4ef6\u304c\u5909\u5316\u3057\u305f\u3068\u304d\u3001\u786c\u76f4\u3057\u305f\u30b9\u30ad\u30fc\u30de\u306f\u5909\u66f4\u304c\u96e3\u3057\u3044\u3002\u65b0\u3057\u3044\u95a2\u4fc2\u6027\u3092\u8ffd\u52a0\u3059\u308b\u306b\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u3092\u524a\u9664\u3057\u3001\u30c7\u30fc\u30bf\u3092\u79fb\u884c\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u518d\u66f8\u304d\u76f4\u3059\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308b\u3002\u67d4\u8edf\u306a\u8a2d\u8a08\u306f\u5909\u5316\u3092\u4e88\u6e2c\u3059\u308b\u3002<\/p>\n

                  \n
                • \u4f8b\uff1a<\/strong>\u4ee5\u524d\u306f\u30e2\u30c7\u30eb\u5316\u3055\u308c\u3066\u3044\u306a\u304b\u3063\u305f\u95a2\u4fc2\u6027\u306b\u65b0\u3057\u3044\u5c5e\u6027\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/li>\n
                • \u5f71\u97ff\uff1a<\/strong>\u6570\u6642\u9593\u306b\u308f\u305f\u3063\u3066\u30c6\u30fc\u30d6\u30eb\u3092\u30ed\u30c3\u30af\u3059\u308bALTER TABLE\u6587\u304c\u5fc5\u8981\u306b\u306a\u308b\u3002<\/li>\n<\/ul>\n

                  \u30c7\u30fc\u30bf\u79fb\u884c<\/h3>\n

                  \u30bf\u30fc\u30b2\u30c3\u30c8\u306eERD\u304c\u30bd\u30fc\u30b9\u3068\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3001\u30b7\u30b9\u30c6\u30e0\u9593\u3067\u306e\u30c7\u30fc\u30bf\u79fb\u884c\u306f\u30ea\u30b9\u30af\u3092\u4f34\u3046\u3002\u6574\u5408\u6027\u306e\u306a\u3044\u57fa\u6570\u306f\u3001\u79fb\u884c\u30d7\u30ed\u30bb\u30b9\u4e2d\u306b\u30c7\u30fc\u30bf\u640d\u5931\u3084\u91cd\u8907\u3092\u5f37\u3044\u308b\u3002<\/p>\n

                  8. \u691c\u8a3c\u306e\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8 \u2705<\/h2>\n

                  ERD\u3092\u6700\u7d42\u6c7a\u5b9a\u3059\u308b\u524d\u306b\u3001\u4f53\u7cfb\u7684\u306a\u76e3\u67fb\u3092\u5b9f\u65bd\u3059\u308b\u3002\u3053\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u4f7f\u3063\u3066\u3001\u6f5c\u5728\u7684\u306a\u8a2d\u8a08\u4e0a\u306e\u6b20\u9665\u3092\u7279\u5b9a\u3059\u308b\u3002<\/p>\n

                    \n
                  • \u3059\u3079\u3066\u306e\u95a2\u4fc2\u6027\u304c\u660e\u793a\u7684\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/strong>\u6697\u9ed9\u306e\u30ea\u30f3\u30af\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n
                  • \u3059\u3079\u3066\u306e\u7dda\u306b\u57fa\u6570\u304c\u30e9\u30d9\u30eb\u4ed8\u3051\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/strong>1:1\u30011:N\u3001\u307e\u305f\u306fM:N\u304c\u660e\u78ba\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n
                  • \u4e3b\u30ad\u30fc\u306f\u4e00\u610f\u3067\u5b89\u5b9a\u3057\u3066\u3044\u308b\u304b\uff1f<\/strong>\u983b\u7e41\u306b\u5909\u5316\u3059\u308b\u81ea\u7136\u30ad\u30fc\u3092\u907f\u3051\u308b\u3002<\/li>\n
                  • \u5916\u90e8\u30ad\u30fc\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3055\u308c\u3066\u3044\u308b\u304b\uff1f<\/strong>\u7d50\u5408\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n
                  • \u6b63\u898f\u5316\u306f\u9069\u5207\u3067\u3059\u304b\uff1f<\/strong>\u66f4\u65b0\u7570\u5e38\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
                  • \u547d\u540d\u898f\u5247\u306f\u4e00\u8cab\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/strong>\u5358\u6570\uff0f\u8907\u6570\u306e\u6df7\u540c\u304c\u306a\u3044\u304b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
                  • \u4e88\u7d04\u8a9e\u306f\u907f\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u304b\uff1f<\/strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u30ea\u30b9\u30c8\u3068\u7167\u5408\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
                  • \u518d\u5e30\u7684\u95a2\u4fc2\u306e\u8a08\u753b\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/strong>\u81ea\u5df1\u53c2\u7167\u5236\u7d04\u3092\u5b9a\u7fa9\u3059\u308b\u3002<\/li>\n<\/ul>\n

                    9. \u30d2\u30e5\u30fc\u30de\u30f3\u30d5\u30a1\u30af\u30bf\u30fc\uff1a\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3 \ud83d\udde3\ufe0f<\/h2>\n

                    \u591a\u304f\u306e\u5834\u5408\u3001ERD\u306e\u5931\u6557\u306f\u6280\u8853\u7684\u306a\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5931\u6557\u3067\u3059\u3002\u56f3\u306f\u30d3\u30b8\u30cd\u30b9\u95a2\u4fc2\u8005\u3068\u6280\u8853\u30c1\u30fc\u30e0\u9593\u306e\u5951\u7d04\u3067\u3059\u3002<\/p>\n

                    \u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u306e\u6b20\u843d<\/h3>\n

                    \u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u304c\u300c\u30e6\u30fc\u30b6\u30fc\u306f\u8907\u6570\u306e\u4f4f\u6240\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u5834\u5408\u3001\u56f3\u304c1:1\u306e\u95a2\u4fc2\u3092\u793a\u3057\u3066\u3044\u308b\u3068\u3001\u6b63\u5f53\u306a\u30d3\u30b8\u30cd\u30b9\u30b7\u30ca\u30ea\u30aa\u304c\u62d2\u5426\u3055\u308c\u307e\u3059\u3002\u56f3\u306f\u73fe\u5728\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u3060\u3051\u3067\u306a\u304f\u3001\u30d3\u30b8\u30cd\u30b9\u904b\u7528\u306e\u73fe\u5b9f\u3092\u53cd\u6620\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

                    \u30b9\u30ad\u30fc\u30de\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406<\/h3>\n

                    \u30b3\u30fc\u30c9\u3068\u540c\u69d8\u306b\u3001\u30b9\u30ad\u30fc\u30de\u306b\u3082\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u304c\u5fc5\u8981\u3067\u3059\u3002\u5909\u66f4\u3092\u8ffd\u8de1\u3057\u306a\u3051\u308c\u3070\u3001\u95a2\u4fc2\u304c\u8ffd\u52a0\u307e\u305f\u306f\u524a\u9664\u3055\u308c\u305f\u7406\u7531\u3092\u76e3\u67fb\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8a2d\u8a08\u3092\u7406\u89e3\u3067\u304d\u308b\u306e\u306f\u4e00\u4eba\u3060\u3051\u3068\u3044\u3046\u300c\u30c8\u30e9\u30a4\u30d0\u30eb\u30ca\u30ec\u30c3\u30b8\u300d\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n

                    10. \u91cd\u8981\u306a\u30d1\u30bf\u30fc\u30f3\u306e\u8981\u7d04 \ud83d\udccb<\/h2>\n

                    \u8981\u3059\u308b\u306b\u3001\u30c7\u30fc\u30bf\u30b7\u30b9\u30c6\u30e0\u306e\u6574\u5408\u6027\u306f\u8a2d\u8a08\u306e\u6b63\u78ba\u3055\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e00\u822c\u7684\u306a\u8aa4\u308a\u3068\u305d\u306e\u4fee\u6b63\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\n\n\n\n
                    \u30a8\u30e9\u30fc\u306e\u7a2e\u985e<\/strong><\/th>\n\u75c7\u72b6<\/strong><\/th>\n\u4fee\u6b63<\/strong><\/th>\n<\/tr>\n
                    \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306e\u6b20\u843d<\/td>\n\u30c7\u30fc\u30bf\u306e\u5236\u9650\u304c\u4e0d\u660e\u77ad<\/td>\n\u660e\u78ba\u306a\u95a2\u4fc2\u30e9\u30d9\u30eb\u3092\u8ffd\u52a0\u3059\u308b<\/td>\n<\/tr>\n
                    \u5916\u90e8\u30ad\u30fc\u306e\u914d\u7f6e\u304c\u8aa4\u3063\u3066\u3044\u308b<\/td>\n\u5faa\u74b0\u4f9d\u5b58<\/td>\n\u30ad\u30fc\u3092\u300c\u591a\u6570\u300d\u5074\u306b\u914d\u7f6e\u3059\u308b<\/td>\n<\/tr>\n
                    \u904e\u5270\u306a\u6b63\u898f\u5316<\/td>\n\u9045\u3044\u30af\u30a8\u30ea\u3001\u7d50\u5408\u304c\u591a\u3059\u304e\u308b<\/td>\n\u6226\u7565\u7684\u306a\u975e\u6b63\u898f\u5316<\/td>\n<\/tr>\n
                    \u4e0d\u5341\u5206\u306a\u6b63\u898f\u5316<\/td>\n\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3001\u7570\u5e38<\/td>\n\u6b63\u898f\u5316\u30eb\u30fc\u30eb\u3092\u9069\u7528\u3059\u308b<\/td>\n<\/tr>\n
                    \u547d\u540d\u304c\u4e0d\u9069\u5207<\/td>\n\u9ad8\u3044\u8a8d\u77e5\u8ca0\u8377<\/td>\n\u4e00\u8cab\u3057\u305f\u547d\u540d\u898f\u5247\u3092\u63a1\u7528\u3059\u308b<\/td>\n<\/tr>\n
                    \u4e88\u7d04\u8a9e<\/td>\n\u69cb\u6587\u30a8\u30e9\u30fc<\/td>\n\u5225\u540d\u307e\u305f\u306f\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u3092\u4f7f\u7528\u3059\u308b<\/td>\n<\/tr>\n<\/table>\n

                    11. \u81ea\u4fe1\u3092\u6301\u3063\u3066\u524d\u9032\u3059\u308b \ud83d\ude80<\/h2>\n

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                    \u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u56f3\u306f\u751f\u304d\u3066\u3044\u308b\u6587\u66f8\u3067\u3059\u3002\u30d3\u30b8\u30cd\u30b9\u304c\u9032\u5316\u3059\u308b\u306b\u3064\u308c\u3066\u3001\u56f3\u3082\u9032\u5316\u3057\u307e\u3059\u3002\u5b9a\u671f\u7684\u306a\u30ec\u30d3\u30e5\u30fc\u306b\u3088\u308a\u3001\u8a2d\u8a08\u304c\u904b\u7528\u4e0a\u306e\u73fe\u5b9f\u3068\u4e00\u81f4\u3057\u305f\u307e\u307e\u4fdd\u305f\u308c\u307e\u3059\u3002ERD\u3092\u4e00\u5ea6\u9650\u308a\u306e\u4f5c\u696d\u3068\u898b\u306a\u3055\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u30c7\u30fc\u30bf\u8cc7\u7523\u306e\u6838\u5fc3\u7684\u306a\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3068\u3057\u3066\u6271\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n

                    \u660e\u78ba\u3055\u306b\u6ce8\u529b\u3059\u308b\u3002\u6574\u5408\u6027\u306b\u6ce8\u529b\u3059\u308b\u3002\u4fdd\u5b88\u6027\u306b\u6ce8\u529b\u3059\u308b\u3002\u3053\u306e3\u3064\u306e\u67f1\u304c\u3001\u591a\u304f\u306e\u30b7\u30b9\u30c6\u30e0\u3092\u60a9\u307e\u305b\u308b\u5931\u6557\u3092\u9632\u3050\u3002\u8a2d\u8a08\u306e\u8ad6\u7406\u3092\u5373\u52b9\u6027\u306e\u5b9f\u88c5\u3088\u308a\u3082\u512a\u5148\u3059\u308b\u3053\u3068\u3067\u3001\u5c06\u6765\u306e\u30c7\u30d0\u30c3\u30b0\u3084\u518d\u8a2d\u8a08\u306b\u81a8\u5927\u306a\u6642\u9593\u3092\u8cbb\u3084\u3059\u3053\u3068\u3092\u907f\u3051\u3089\u308c\u308b\u3002<\/p>\n

                    \u95a2\u4fc2\u6027\u3092\u691c\u8a3c\u3059\u308b\u6642\u9593\u3092\u53d6\u308b\u3002\u30ad\u30fc\u3092\u78ba\u8a8d\u3059\u308b\u3002\u6b63\u898f\u5316\u3092\u518d\u78ba\u8a8d\u3059\u308b\u3002\u4eca\u6295\u8cc7\u3059\u308b\u52aa\u529b\u306f\u3001\u5f8c\u306e\u30b7\u30b9\u30c6\u30e0\u306e\u5b89\u5b9a\u6027\u306b\u5927\u304d\u306a\u5229\u76ca\u3092\u3082\u305f\u3089\u3059\u3002\u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305f\u30b9\u30ad\u30fc\u30de\u306f\u6a5f\u80fd\u3057\u3066\u3044\u308b\u3068\u304d\u306f\u76ee\u7acb\u305f\u305a\u3001\u5931\u6557\u3057\u305f\u3068\u304d\u306f\u9855\u8457\u306b\u306a\u308b\u3002\u6a5f\u80fd\u3059\u308b\u8a2d\u8a08\u3092\u9078\u3076\u3053\u3068\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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