{"id":1729,"date":"2026-04-10T04:07:26","date_gmt":"2026-04-10T04:07:26","guid":{"rendered":"https:\/\/www.viz-note.com\/ja\/challenging-erd-scenarios-principal-dbas\/"},"modified":"2026-04-10T04:07:26","modified_gmt":"2026-04-10T04:07:26","slug":"challenging-erd-scenarios-principal-dbas","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/ja\/challenging-erd-scenarios-principal-dbas\/","title":{"rendered":"\u4e3b\u8981\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u8005\u3068\u306eQ&A\uff1a\u6211\u3005\u304c\u76f4\u9762\u3057\u305f\u6700\u3082\u56f0\u96e3\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306e\u30b7\u30ca\u30ea\u30aa"},"content":{"rendered":"

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\n
\"Marker-style<\/figure>\n<\/div>\n

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    \n
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      \n
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        \n
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        \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u306f\u3001\u7d99\u627f\u306f\u6a19\u6e96\u3067\u3042\u308b\u3002\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u3001\u3053\u308c\u306f\u30b9\u30c8\u30ec\u30fc\u30b8\u3068\u53d6\u5f97\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u8a2d\u8a08\u9078\u629e\u3067\u3042\u308b\u3002\u554f\u984c\u306f\u3001\u8eca\u4e21\u3092\u5358\u4e00\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u3057\u3066\u30e2\u30c7\u30ea\u30f3\u30b0\u3059\u308b\u304b\u3001Vehicle\u3001Car\u3001Truck\u306b\u5206\u5272\u3059\u308b\u304b\u3067\u3042\u308b\u3002<\/p>\n

        \u30aa\u30d7\u30b7\u30e7\u30f3A\uff1a\u5358\u4e00\u30c6\u30fc\u30d6\u30eb\u7d99\u627f<\/strong><\/p>\n

        \u3059\u3079\u3066\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u306e\u5c5e\u6027\u304c1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u542b\u307e\u308c\u307e\u3059\u3002\u4f7f\u7528\u3055\u308c\u3066\u3044\u306a\u3044\u5c5e\u6027\u306b\u306fNULL\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

          \n
        • \u9577\u6240\uff1a<\/em>\u30b7\u30f3\u30d7\u30eb\u306a\u30af\u30a8\u30ea\u3001\u3069\u306e\u8eca\u4e21\u3082\u691c\u7d22\u3059\u308b\u969b\u306b\u7d50\u5408\u304c\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n
        • \u77ed\u6240\uff1a<\/em>\u30c6\u30fc\u30d6\u30eb\u306e\u80a5\u5927\u5316\u3001\u30b5\u30d6\u30bf\u30a4\u30d7\u56fa\u6709\u306e\u5236\u7d04\u3092\u9069\u7528\u3057\u306b\u304f\u304f\u3001\u591a\u304f\u306e\u30ab\u30e9\u30e0\u304cNULL\u306b\u306a\u308b\u3002<\/li>\n<\/ul>\n

          \u30aa\u30d7\u30b7\u30e7\u30f3B\uff1a\u30af\u30e9\u30b9\u30c6\u30fc\u30d6\u30eb\u7d99\u627f<\/strong><\/p>\n

          \u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\uff08Vehicle\uff09\u7528\u306e1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3068\u3001\u30b5\u30d6\u30af\u30e9\u30b9\uff08Car\u3001Truck\uff09\u7528\u306e\u5225\u3005\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308a\u3001\u4e3b\u30ad\u30fc\u306b\u3088\u3063\u3066\u30ea\u30f3\u30af\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n

            \n
          • \u9577\u6240\uff1a<\/em>\u660e\u78ba\u306a\u5206\u96e2\u3001NULL\u304c\u5b58\u5728\u3057\u306a\u3044\u3001\u5404\u30b5\u30d6\u30bf\u30a4\u30d7\u3054\u3068\u306b\u53b3\u683c\u306a\u5236\u7d04\u304c\u53ef\u80fd\u3002<\/li>\n
          • \u77ed\u6240\uff1a<\/em>\u30af\u30a8\u30ea\u306b\u306f\u8907\u6570\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u7d50\u5408\u304c\u5fc5\u8981\u3068\u306a\u308a\u3001\u8aad\u307f\u53d6\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n

            \u5f53\u793e\u306e\u4e3b\u8981DBA\u306f\u3001\u9078\u629e\u306f\u3057\u3070\u3057\u3070\u30af\u30a8\u30ea\u30d1\u30bf\u30fc\u30f3\u306b\u4f9d\u5b58\u3059\u308b\u3068\u6307\u6458\u3057\u307e\u3057\u305f\u3002\u7279\u5b9a\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3092\u983b\u7e41\u306b\u30af\u30a8\u30ea\u3059\u308b\u5834\u5408\u306f\u3001\u30af\u30e9\u30b9\u30c6\u30fc\u30d6\u30eb\u65b9\u5f0f\u304c\u3088\u308a\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30b5\u30d6\u30bf\u30a4\u30d7\u3092\u96c6\u8a08\u3057\u3066\u983b\u7e41\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5834\u5408\u306f\u3001\u5358\u4e00\u30c6\u30fc\u30d6\u30eb\u65b9\u5f0f\u304c\u512a\u308c\u3066\u3044\u307e\u3059\u3002ERD\u306f\u3053\u306e\u610f\u601d\u6c7a\u5b9a\u3092\u660e\u78ba\u306b\u53cd\u6620\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5c06\u6765\u306e\u958b\u767a\u8005\u304c\u6df7\u4e71\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n

            4. \u6642\u7cfb\u5217\u30c7\u30fc\u30bf\uff1a\u6642\u9593\u306e\u7d4c\u904e\u306b\u4f34\u3046\u5909\u66f4\u306e\u8ffd\u8de1 \u23f3<\/h2>\n

            \u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u306f\u5909\u5316\u3059\u308b\u3002\u9867\u5ba2\u304c\u5f15\u3063\u8d8a\u3057\u3001\u4fa1\u683c\u304c\u66f4\u65b0\u3055\u308c\u3001\u5951\u7d04\u304c\u671f\u9650\u5207\u308c\u306b\u306a\u308b\u3002\u73fe\u5728\u306e\u72b6\u614b\u3060\u3051\u3092\u4fdd\u5b58\u3059\u308b\u306e\u306f\u3001\u76e3\u67fb\u3084\u30ec\u30dd\u30fc\u30c8\u306b\u304a\u3044\u3066\u3057\u3070\u3057\u3070\u4e0d\u5341\u5206\u3067\u3042\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6642\u7cfb\u5217\u30c6\u30fc\u30d6\u30eb\u3084\u5f90\u3005\u306b\u5909\u5316\u3059\u308b\u6b21\u5143\uff08SCD\uff09\u306e\u8a2d\u8a08\u304c\u751f\u3058\u308b\u3002<\/p>\n

            \u8907\u96d1\u3055\uff1a<\/strong><\/p>\n

            \u884c\u306e\u66f4\u65b0\u3067\u306f\u306a\u304f\u3001\u6709\u52b9\u958b\u59cb\u65e5\u3068\u7d42\u4e86\u65e5\u3092\u542b\u3080\u65b0\u3057\u3044\u884c\u3092\u633f\u5165\u3059\u308b\u3002\u53e4\u3044\u884c\u306f\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u3068\u3057\u3066\u30de\u30fc\u30af\u3055\u308c\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5c65\u6b74\u30c7\u30fc\u30bf\u306e\u30b9\u30c8\u30ec\u30fc\u30b8\u8981\u4ef6\u304c2\u500d\u306b\u306a\u308a\u3001\u300c\u73fe\u5728\u306e\u30d3\u30e5\u30fc\u300d\u3092\u53d6\u5f97\u3059\u308b\u30af\u30a8\u30ea\u304c\u8907\u96d1\u5316\u3059\u308b\u3002<\/p>\n

            \u30af\u30a8\u30ea\u306e\u8ab2\u984c\uff1a<\/strong><\/p>\n

            \u7279\u5b9a\u306e\u6642\u70b9\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u3092\u9078\u629e\u3059\u308b\u306b\u306f\u3001\u65e5\u4ed8\u7bc4\u56f2\u3067\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002\u65e5\u4ed8\u7bc4\u56f2\u306e\u30ed\u30b8\u30c3\u30af\u3092\u8aa4\u308b\u3068\u3001\u8aa4\u3063\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u8fd4\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3053\u308c\u306f\u91d1\u878d\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u554f\u984c\u304c\u9855\u5728\u5316\u3059\u308b\u3088\u304f\u3042\u308b\u5834\u9762\u3067\u3042\u308b\u3002<\/p>\n

              \n
            • \u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u8a2d\u8a08\uff1a<\/strong>\u7279\u5b9a\u6642\u70b9\u3067\u306e\u72b6\u614b\u3092\u4fdd\u5b58\u3059\u308b\u3002\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3092\u66f8\u304d\u8fbc\u3080\u305f\u3081\u306b\u5b9a\u671f\u7684\u306a\u30d0\u30c3\u30c1\u30b8\u30e7\u30d6\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002<\/li>\n
            • \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30ed\u30b0\u8a2d\u8a08\uff1a<\/strong>\u3059\u3079\u3066\u306e\u5909\u66f4\u3092\u8a18\u9332\u3059\u308b\u3002\u66f8\u304d\u8fbc\u307f\u91cf\u304c\u975e\u5e38\u306b\u591a\u304f\u3001\u53d6\u5f97\u30ed\u30b8\u30c3\u30af\u304c\u8907\u96d1\u306b\u306a\u308b\u3002<\/li>\n
            • \u5b9a\u671f\u7684\u8a2d\u8a08\uff1a<\/strong>\u6709\u52b9\u671f\u9593\u3092\u4fdd\u5b58\u3059\u308b\u3002\u6642\u9593\u306e\u30ae\u30e3\u30c3\u30d7\u3092\u3046\u307e\u304f\u6271\u3048\u308b\u304c\u3001\u5883\u754c\u7ba1\u7406\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002<\/li>\n<\/ul>\n

              5. \u5206\u6563\u30b7\u30b9\u30c6\u30e0\uff1a\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u95a2\u4fc2\u6027 \ud83d\udd17<\/h2>\n

              \u5358\u4e00\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u304c\u5fc5\u9808\u3068\u306a\u308b\u3002\u3053\u3053\u304cERD\u8a2d\u8a08\u304c\u6700\u3082\u53b3\u3057\u3044\u7269\u7406\u7684\u5236\u7d04\u306b\u76f4\u9762\u3059\u308b\u5834\u6240\u3067\u3042\u308b\u3002\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u5883\u754c\u3092\u307e\u305f\u3050\u95a2\u4fc2\u6027\u306f\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308b\u3002<\/p>\n

              \u7d50\u5408\u306e\u554f\u984c\uff1a<\/strong><\/p>\n

              Table A\u304cUser ID\u3067\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001Table B\u304cTable A\u306b\u30ea\u30f3\u30af\u3055\u308c\u3066\u3044\u308b\u306a\u3089\u3070\u3001Table B\u3082\u540c\u3058User ID\u3067\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u306a\u3051\u308c\u3070\u3001\u5206\u6563\u7d50\u5408\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002Table B\u304c\u4ed6\u306e\u3082\u306e\u3067\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30af\u30a8\u30ea\u3092\u8907\u6570\u306e\u30b7\u30e3\u30fc\u30c9\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u3001\u7d50\u679c\u3092\u7d71\u5408\u3057\u3066\u30ed\u30fc\u30ab\u30eb\u3067\u7d50\u5408\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n

              \u53c2\u7167\u6574\u5408\u6027\uff1a<\/strong><\/p>\n

              \u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306f\u5206\u6563\u30ce\u30fc\u30c9\u9593\u3067\u5f37\u5236\u3059\u308b\u306e\u304c\u96e3\u3057\u3044\u3002\u591a\u304f\u306e\u30b7\u30b9\u30c6\u30e0\u306f\u53ef\u7528\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u74b0\u5883\u3067\u5916\u90e8\u30ad\u30fc\u3092\u7121\u52b9\u5316\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u6574\u5408\u6027\u306e\u8ca0\u62c5\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5c64\u306b\u79fb\u3055\u308c\u3001\u7af6\u5408\u72b6\u614b\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308b\u3002<\/p>\n

              \u5206\u6563ERD\u306e\u8981\u70b9\uff1a<\/strong><\/p>\n

                \n
              • \u8907\u6570\u306e\u30b7\u30e3\u30fc\u30c9\u306b\u307e\u305f\u304c\u308b\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u907f\u3051\u308b\u3002<\/li>\n
              • \u30ce\u30fc\u30c9\u9593\u306e\u7d50\u5408\u306e\u5fc5\u8981\u6027\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b\u3001\u30c7\u30fc\u30bf\u3092\u6b63\u898f\u5316\u3057\u306a\u3044\uff08\u30c7\u30ce\u30fc\u30de\u30e9\u30a4\u30ba\uff09\u3059\u308b\u3002<\/li>\n
              • \u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u30ad\u30fc\uff08\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0\u30ad\u30fc\uff09\u3092\u3001\u4e3b\u30ad\u30fc\u3060\u3051\u3067\u306a\u304f\u6700\u3082\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u30af\u30a8\u30ea\u30d1\u30bf\u30fc\u30f3\u306b\u57fa\u3065\u3044\u3066\u8a2d\u8a08\u3059\u308b\u3002<\/li>\n<\/ul>\n

                6. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9 vs. \u6b63\u898f\u5316\uff1a\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306e\u30d0\u30e9\u30f3\u30b9 \u2696\ufe0f<\/h2>\n

                \u6b63\u898f\u5316\uff081NF\u30012NF\u30013NF\uff09\u306f\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u30b4\u30fc\u30eb\u30c9\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u3068\u3057\u3066\u6559\u3048\u3089\u308c\u308b\u3002\u3057\u304b\u3057\u3001\u9ad8\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u53b3\u683c\u306a\u6b63\u898f\u5316\u304c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8457\u3057\u304f\u4f4e\u4e0b\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002ERD\u306f\u4e21\u8005\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u3089\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/p>\n

                \u30c7\u30ce\u30fc\u30de\u30e9\u30a4\u30ba\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0\uff1a<\/strong><\/p>\n

                  \n
                • \u8aad\u307f\u8fbc\u307f\u4e2d\u5fc3\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\uff1a<\/strong>\u8aad\u307f\u8fbc\u307f\u304c\u66f8\u304d\u8fbc\u307f\u3088\u308a\u3082\u306f\u308b\u304b\u306b\u591a\u3044\u5834\u5408\u3001\u5197\u9577\u306a\u30ab\u30e9\u30e0\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u7d50\u5408\u64cd\u4f5c\u3092\u7bc0\u7d04\u3067\u304d\u308b\u3002<\/li>\n
                • \u30ec\u30dd\u30fc\u30c8\u8981\u4ef6\uff1a<\/strong>\u6b63\u898f\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u4e0a\u306e\u96c6\u8a08\u306b\u306f\u8907\u96d1\u306a\u7d50\u5408\u304c\u5fc5\u8981\u3068\u306a\u308a\u3001\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306e\u52d5\u4f5c\u3092\u9045\u304f\u3059\u308b\u3002<\/li>\n
                • \u66f8\u304d\u8fbc\u307f\u4e2d\u5fc3\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\uff1a<\/strong>\u6642\u3068\u3057\u3066\u3001\u30c7\u30fc\u30bf\u3092\u5225\u3005\u306b\u4fdd\u6301\u3059\u308b\u3053\u3068\u3067\u3001\u66f4\u65b0\u6642\u306e\u30ed\u30c3\u30af\u7af6\u5408\u3092\u6e1b\u3089\u305b\u308b\u3002<\/li>\n<\/ul>\n

                  \u30d1\u30cd\u30eb\u306f\u3001\u300e\u5b8c\u74a7\u306a\u30b9\u30ad\u30fc\u30de\u300f\u306f\u5b58\u5728\u3057\u306a\u3044\u3068\u5f37\u8abf\u3057\u305f\u3002\u305d\u308c\u306f\u59a5\u5354\u306e\u7523\u7269\u3067\u3042\u308b\u3002ERD\u306f\u30c7\u30ce\u30fc\u30de\u30e9\u30a4\u30ba\u304c\u3069\u3053\u3067\u884c\u308f\u308c\u3001\u306a\u305c\u884c\u308f\u308c\u305f\u306e\u304b\u3092\u6587\u66f8\u5316\u3059\u3079\u304d\u3067\u3042\u308a\u3001\u5c06\u6765\u306e\u4fdd\u5b88\u62c5\u5f53\u8005\u304c\u5197\u9577\u6027\u304c\u610f\u56f3\u7684\u3067\u3042\u308b\u3053\u3068\u3092\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3079\u304d\u3067\u3042\u308b\u3002<\/p>\n

                  \u30e2\u30c7\u30ea\u30f3\u30b0\u30d1\u30bf\u30fc\u30f3\u306e\u6bd4\u8f03 \ud83d\udcca<\/h2>\n

                  \u610f\u601d\u6c7a\u5b9a\u3092\u652f\u63f4\u3059\u308b\u305f\u3081\u306b\u3001\u8b70\u8ad6\u3055\u308c\u305f\u30e2\u30c7\u30ea\u30f3\u30b0\u30d1\u30bf\u30fc\u30f3\u3068\u305d\u306e\u5178\u578b\u7684\u306a\u4f7f\u7528\u30b1\u30fc\u30b9\u306e\u8981\u7d04\u3092\u4ee5\u4e0b\u306b\u793a\u3059\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n
                  \u30d1\u30bf\u30fc\u30f3<\/th>\n\u6700\u9069\u306a\u4f7f\u7528\u30b1\u30fc\u30b9<\/th>\n\u4e3b\u306a\u30ea\u30b9\u30af<\/th>\n\u8907\u96d1\u3055<\/th>\n<\/tr>\n<\/thead>\n
                  \u5358\u4e00\u30c6\u30fc\u30d6\u30eb<\/td>\n\u5358\u7d14\u306a\u968e\u5c64\u69cb\u9020\u3001\u7a2e\u985e\u304c\u5c11\u306a\u3044<\/td>\nNULL\u30d5\u30a3\u30fc\u30eb\u30c9\u3001\u30b9\u30ad\u30fc\u30de\u306e\u80a5\u5927\u5316<\/td>\n\u4f4e<\/td>\n<\/tr>\n
                  \u30af\u30e9\u30b9\u30c6\u30fc\u30d6\u30eb<\/td>\n\u53b3\u5bc6\u306a\u30b5\u30d6\u30bf\u30a4\u30d7\u3001\u660e\u78ba\u306a\u5c5e\u6027<\/td>\n\u7d50\u5408\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/td>\n\u4e2d<\/td>\n<\/tr>\n
                  \u518d\u5e30\u7684<\/td>\n\u7d44\u7e54\u56f3\u3001\u30ab\u30c6\u30b4\u30ea<\/td>\n\u8d70\u67fb\u306e\u6df1\u3055\u3001\u30b5\u30a4\u30af\u30eb<\/td>\n\u9ad8<\/td>\n<\/tr>\n
                  \u95a2\u9023\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/td>\n\u5c5e\u6027\u4ed8\u304d\u306e\u591a\u5bfe\u591a<\/td>\n\u7d50\u5408\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td>\n\u4e2d<\/td>\n<\/tr>\n
                  \u6642\u7cfb\u5217<\/td>\n\u76e3\u67fb\u3001\u5c65\u6b74\u8ffd\u8de1<\/td>\n\u30af\u30a8\u30ea\u306e\u8907\u96d1\u3055<\/td>\n\u9ad8<\/td>\n<\/tr>\n
                  \u5206\u6563\u30b7\u30e3\u30fc\u30c7\u30a3\u30f3\u30b0<\/td>\n\u5927\u898f\u6a21\u30b9\u30b1\u30fc\u30eb\u3001\u6c34\u5e73\u62e1\u5f35<\/td>\n\u53c2\u7167\u6574\u5408\u6027<\/td>\n\u975e\u5e38\u306b\u9ad8\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                  ERD\u30ec\u30d3\u30e5\u30fc\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8 \u2705<\/h2>\n

                  \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u3092\u6700\u7d42\u78ba\u5b9a\u3059\u308b\u524d\u306b\u3001\u3053\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u4f7f\u3063\u3066\u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74\u3092\u767a\u898b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u8a2d\u8a08\u6bb5\u968e\u3067\u3053\u308c\u3089\u306e\u554f\u984c\u3092\u767a\u898b\u3059\u308b\u307b\u3046\u304c\u3001\u672c\u756a\u74b0\u5883\u3067\u767a\u898b\u3059\u308b\u3088\u308a\u3082\u826f\u3044\u3067\u3059\u3002<\/p>\n

                    \n
                  • \u57fa\u6570\uff1a<\/strong>1\u5bfe1\u30011\u5bfe\u591a\u3001\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u5b9a\u7fa9\u3057\u307e\u3057\u305f\u304b\uff1f\u6700\u5c0f\/\u6700\u5927\u5236\u7d04\uff080..1\u30011..*\uff09\u306f\u660e\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n
                  • \u30c7\u30fc\u30bf\u578b\uff1a<\/strong>\u5217\u306e\u30c7\u30fc\u30bf\u578b\u304c\u60f3\u5b9a\u3055\u308c\u308b\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\uff08\u4f8b\uff1aID\u306bInteger\u3068Varchar\u306e\u3069\u3061\u3089\u3092\u4f7f\u7528\u3059\u308b\u304b\uff09<\/li>\n
                  • Null\u8a31\u5bb9\u6027\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u306fNull\u3092\u8a31\u5bb9\u3057\u307e\u3059\u304b\uff1f\u8a31\u5bb9\u3059\u308b\u5834\u5408\u3001\u30ed\u30b8\u30c3\u30af\u306f\u5b64\u7acb\u3057\u305f\u53c2\u7167\u3092\u9069\u5207\u306b\u51e6\u7406\u3057\u307e\u3059\u304b\uff1f<\/li>\n
                  • \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565\uff1a<\/strong>ERD\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u306e\u305f\u3081\u3001\u3069\u306e\u5217\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4ed8\u3051\u308b\u3079\u304d\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\u5916\u90e8\u30ad\u30fc\u306f\u7d50\u5408\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u306b\u983b\u7e41\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3055\u308c\u307e\u3059\u3002<\/li>\n
                  • \u547d\u540d\u898f\u5247\uff1a<\/strong>\u30c6\u30fc\u30d6\u30eb\u540d\u3068\u5217\u540d\u306f\u4e00\u8cab\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\u5f8c\u3067\u66d6\u6627\u306b\u306a\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u7701\u7565\u8a9e\u306f\u907f\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
                  • \u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\uff1a<\/strong>\u5236\u7d04\uff08\u4f8b\uff1a\u300c\u30e6\u30fc\u30b6\u30fc\u306f2\u3064\u306e\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3\u3092\u6301\u3064\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u300d\uff09\u306f\u8ad6\u7406\u30c1\u30a7\u30c3\u30af\u307e\u305f\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5236\u7d04\u3068\u3057\u3066\u8868\u73fe\u3055\u308c\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n
                  • \u62e1\u5f35\u6027\uff1a<\/strong> \u30b9\u30ad\u30fc\u30de\u306f\u5b8c\u5168\u306a\u79fb\u884c\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u65b0\u3057\u3044\u5c5e\u6027\u3092\u5bfe\u5fdc\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u304b\uff1f\uff08\u4f8b\u3048\u3070\u3001\u9069\u5207\u306a\u5834\u9762\u3067\u306fEAV\u30d1\u30bf\u30fc\u30f3\u3084JSON\u30ab\u30e9\u30e0\u3092\u4f7f\u7528\u3059\u308b\u306a\u3069\uff09\u3002<\/li>\n<\/ul>\n

                    \u30c7\u30fc\u30bf\u30e2\u30c7\u30ea\u30f3\u30b0\u306b\u95a2\u3059\u308b\u6700\u7d42\u7684\u306a\u8003\u5bdf \ud83e\udde0<\/h2>\n

                    \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u3092\u8a2d\u8a08\u3059\u308b\u3053\u3068\u306f\u3001\u7bb1\u3068\u7dda\u3092\u63cf\u304f\u3053\u3068\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3084\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306e\u5236\u7d04\u3001\u30d3\u30b8\u30cd\u30b9\u306e\u30cb\u30fc\u30ba\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u306b\u8ff0\u3079\u305f\u30b7\u30ca\u30ea\u30aa\u306f\u3001\u7406\u8ad6\u3068\u5b9f\u8df5\u304c\u3076\u3064\u304b\u308a\u5408\u3046\u6469\u64e6\u70b9\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

                    \u3053\u308c\u3089\u306e\u8ab2\u984c\u2014\u2014\u518d\u5e30\u7684\u6df1\u3055\u3001\u5206\u6563\u7d50\u5408\u3001\u6642\u7cfb\u5217\u5c65\u6b74\u3001\u7d99\u627f\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u2014\u2014\u3092\u4e8b\u524d\u306b\u60f3\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u8010\u969c\u5bb3\u6027\u306e\u3042\u308b\u30b9\u30ad\u30fc\u30de\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002\u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305fERD\u306f\u6280\u8853\u7684\u8ca0\u50b5\u3092\u524a\u6e1b\u3057\u3001\u5c06\u6765\u306e\u9ad8\u30b3\u30b9\u30c8\u306a\u518d\u8a2d\u8a08\u3092\u9632\u304e\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e\u5b89\u5b9a\u6027\u3078\u306e\u6295\u8cc7\u3067\u3059\u3002<\/p>\n

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