{"id":1697,"date":"2026-03-26T17:55:23","date_gmt":"2026-03-26T17:55:23","guid":{"rendered":"https:\/\/www.go-diagram.com\/ja\/resolving-many-to-many-relationships-erd-modeling\/"},"modified":"2026-03-26T17:55:23","modified_gmt":"2026-03-26T17:55:23","slug":"resolving-many-to-many-relationships-erd-modeling","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/ja\/resolving-many-to-many-relationships-erd-modeling\/","title":{"rendered":"\u591a\u5bfe\u591a\u95a2\u4fc2\u306e\u89e3\u6c7a\uff1aERD\u30e2\u30c7\u30ea\u30f3\u30b0\u306e\u660e\u78ba\u306a\u6280\u8853"},"content":{"rendered":"<p>\u30c7\u30fc\u30bf\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u5206\u91ce\u306b\u304a\u3044\u3066\u3001\u591a\u5bfe\u591a\u95a2\u4fc2\u307b\u3069\u6df7\u4e71\u3092\u62db\u304f\u6982\u5ff5\u306f\u5c11\u306a\u3044\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u3092\u8a2d\u8a08\u3059\u308b\u969b\u3001\u3042\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u8907\u6570\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u95a2\u9023\u3057\u3001\u305d\u306e\u9006\u3082\u6210\u308a\u7acb\u3064\u72b6\u6cc1\u306b\u76f4\u9762\u3059\u308b\u3068\u3001\u7279\u5b9a\u306e\u69cb\u9020\u7684\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u76f4\u63a5\u7684\u306a\u591a\u5bfe\u591a\u95a2\u9023\u3092\u30cd\u30a4\u30c6\u30a3\u30d6\u306b\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u306a\u3044\u3002\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u7dad\u6301\u3057\u3001\u52b9\u7387\u7684\u306a\u30af\u30a8\u30ea\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u306f\u4e2d\u9593\u69cb\u9020\u3092\u5fc5\u8981\u3068\u3059\u308b\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u95a2\u9023\u3092\u89e3\u6c7a\u3059\u308b\u6a29\u5a01\u7684\u306a\u624b\u6cd5\u3092\u691c\u8a0e\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304c\u5805\u7262\u3067\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u304b\u3064\u6b63\u898f\u5316\u3055\u308c\u305f\u72b6\u614b\u3092\u4fdd\u3064\u3053\u3068\u3092\u78ba\u5b9f\u306b\u3059\u308b\u3002<\/p>\n<p>\u5b66\u8853\u8a18\u9332\u306e\u30b7\u30b9\u30c6\u30e0\u8a2d\u8a08\u3001\u5728\u5eab\u7ba1\u7406\u3001\u30e6\u30fc\u30b6\u30fc\u6a29\u9650\u306e\u3044\u305a\u308c\u3092\u5bfe\u8c61\u3068\u3057\u3066\u3082\u3001\u3053\u308c\u3089\u306e\u57fa\u6570\u3092\u89e3\u6c7a\u3059\u308b\u539f\u5247\u306f\u5e38\u306b\u540c\u3058\u3067\u3042\u308b\u3002\u80cc\u5f8c\u306b\u3042\u308b\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u5c06\u6765\u306e\u7570\u5e38\u3092\u9632\u304e\u3001\u4fdd\u5b88\u4f5c\u696d\u3092\u7c21\u7d20\u5316\u3067\u304d\u308b\u3002\u8868\u9762\u7684\u306a\u5b9a\u7fa9\u3092\u8d85\u3048\u3066\u3001\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306a\u30c7\u30fc\u30bf\u30e2\u30c7\u30ea\u30f3\u30b0\u3092\u5b9a\u7fa9\u3059\u308b\u69cb\u9020\u7684\u8981\u4ef6\u3001\u6b63\u898f\u5316\u30eb\u30fc\u30eb\u3001\u5b9f\u88c5\u6226\u7565\u3092\u691c\u8a0e\u3059\u308b\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Charcoal sketch infographic illustrating how to resolve many-to-many relationships in Entity-Relationship Diagrams using a junction table, showing Students and Courses entities connected through an Enrollments bridge table with foreign keys, composite primary keys, and crow's foot cardinality notation\" decoding=\"async\" src=\"https:\/\/www.go-diagram.com\/wp-content\/uploads\/2026\/03\/resolving-many-to-many-relationships-erd-junction-table-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83d\udd0d ERD\u306b\u304a\u3051\u308b\u57fa\u6570\u306e\u7406\u89e3<\/h2>\n<p>\u57fa\u6570\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u6570\u7684\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3042\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3001\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u95a2\u9023\u3067\u304d\u308b\u6570\uff08\u307e\u305f\u306f\u95a2\u9023\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u6570\uff09\u3092\u6307\u5b9a\u3059\u308b\u3002ERD\u8868\u8a18\u3067\u306f\u3001\u901a\u5e38\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7d50\u3076\u7dda\u3067\u8868\u73fe\u3055\u308c\u3001\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\uff08\u30ab\u30e2\u30e1\u306e\u8db3\uff09\u304c\u300c\u8907\u6570\u300d\u5074\u3092\u3001\u76f4\u7dda\u307e\u305f\u306f\u5358\u4e00\u306e\u5370\u304c\u300c1\u3064\u300d\u5074\u3092\u793a\u3059\u3002<\/p>\n<p>\u4e3b\u306a\u57fa\u6570\u306f\u4ee5\u4e0b\u306e3\u3064\u3067\u3042\u308b\uff1a<\/p>\n<ul>\n<li><strong>1\u5bfe1\uff081:1\uff09\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u3068\u95a2\u9023\u3059\u308b\u3002\u4f8b\uff1a\u500b\u4eba\u3068\u305d\u306e\u30d1\u30b9\u30dd\u30fc\u30c8\u3002<\/li>\n<li><strong>1\u5bfe\u591a\uff081:M\uff09\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u3068\u95a2\u9023\u3059\u308b\u3002\u4f8b\uff1a\u9867\u5ba2\u304c\u8907\u6570\u306e\u6ce8\u6587\u3092\u884c\u3046\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\uff08M:N\uff09\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u3068\u95a2\u9023\u3059\u308b\u3002\u4f8b\uff1a\u5b66\u751f\u304c\u8907\u6570\u306e\u6388\u696d\u306b\u767b\u9332\u3057\u3001\u6388\u696d\u306b\u8907\u6570\u306e\u5b66\u751f\u304c\u542b\u307e\u308c\u308b\u3002<\/li>\n<\/ul>\n<p>1:1\u304a\u3088\u30731:M\u95a2\u4fc2\u306f\u7269\u7406\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u4e0a\u3067\u5b9f\u88c5\u3057\u3084\u3059\u3044\u304c\u3001M:N\u95a2\u4fc2\u306f\u72ec\u81ea\u306e\u8ab2\u984c\u3092\u63d0\u793a\u3059\u308b\u3002\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u7406\u8ad6\u3067\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u30bb\u30eb\u306b\u306f\u539f\u5b50\u5024\uff08\u539f\u5b50\u7684\u306a\u5024\uff09\u306e\u307f\u3092\u542b\u3080\u3079\u304d\u3067\u3042\u308b\u3068\u5b9a\u3081\u3066\u3044\u308b\u3002\u30c6\u30fc\u30d6\u30ebA\u306e1\u884c\u304c\u3001\u7406\u8ad6\u4e0a\u30c6\u30fc\u30d6\u30ebB\u306e\u8907\u6570\u884c\u3092\u53c2\u7167\u3067\u304d\u308b\u3088\u3046\u306a\u76f4\u63a5\u7684\u306a\u30ea\u30f3\u30af\u306f\u3001\u7269\u7406\u30ec\u30a4\u30e4\u30fc\u306b\u304a\u3044\u3066\u3053\u306e\u539f\u5247\u306b\u9055\u53cd\u3059\u308b\u3002<\/p>\n<h2>\ud83d\udeab 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101, 102, 103\u300d\uff09\u3068\u3001\u7b2c1\u6b63\u898f\u5f62\uff081NF\uff09\u306b\u9055\u53cd\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7279\u5b9a\u306e\u95a2\u4fc2\u3092\u30af\u30a8\u30ea\u3001\u66f4\u65b0\u3001\u524a\u9664\u3059\u308b\u969b\u306b\u8a08\u7b97\u30b3\u30b9\u30c8\u304c\u9ad8\u304f\u306a\u308a\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308b\u3002<\/li>\n<\/ul>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u3053\u306e\u30c7\u30fc\u30bf\u3092\u52b9\u7387\u7684\u306b\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u95a2\u4fc2\u81ea\u4f53\u3092\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u3066\u6271\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u3053\u306e\u5909\u63db\u304c\u3001\u8907\u96d1\u3055\u3092\u89e3\u6c7a\u3059\u308b\u6838\u5fc3\u7684\u306a\u6280\u8853\u3067\u3042\u308b\u3002<\/p>\n<h2>\ud83e\uddf1 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\u4e00\u90e8\u306e\u30b1\u30fc\u30b9\u3067\u306f\u3001\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306b\u4e00\u610f\u306e\u81ea\u52d5\u5897\u5206ID\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u95a2\u4fc2\u304c\u7570\u306a\u308b\u5c5e\u6027\u3092\u6301\u3064\u8907\u6570\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u6301\u3064\u5834\u5408\u306b\u6709\u7528\u3067\u3059\uff08\u305f\u3068\u3048\u3070\u3001\u5b66\u751f\u304c\u7570\u306a\u308b\u5e74\u9593\u306b\u7570\u306a\u308b\u6210\u7e3e\u3067\u540c\u3058\u30b3\u30fc\u30b9\u306b\u8907\u6570\u56de\u767b\u9332\u3055\u308c\u308b\u5834\u5408\u306a\u3069\uff09\u3002<\/li>\n<\/ul>\n<p><strong>\u4f8b\u306e\u30b7\u30ca\u30ea\u30aa\uff1a<\/strong><\/p>\n<p>\u56f3\u66f8\u9928\u30b7\u30b9\u30c6\u30e0\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<strong>\u672c<\/strong>\u306f\u591a\u304f\u306e<strong>\u5229\u7528\u8005<\/strong>\u306b\u3088\u3063\u3066\u501f\u308a\u3089\u308c\u307e\u3059\u3002<strong>\u5229\u7528\u8005<\/strong>\u306f\u591a\u304f\u306e<strong>\u672c<\/strong>.<\/p>\n<ul>\n<li>\u89e3\u6c7a\u306a\u3057\uff1a1\u3064\u306e\u672c\u306e\u884c\u3092\u8907\u6570\u306e\u5229\u7528\u8005\u306e\u884c\u306b\u76f4\u63a5\u30ea\u30f3\u30af\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<li>\u89e3\u6c7a\u7b56\u3042\u308a\uff1a<strong>\u8cb8\u51fa\u8a18\u9332<\/strong>\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e<strong>\u8cb8\u51fa\u8a18\u9332<\/strong>\u306b\u306f<code>\u672cID<\/code>\u3068<code>\u5229\u7528\u8005ID<\/code>.<\/li>\n<\/ul>\n<p>\u3053\u306e\u69cb\u9020\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3001\u3069\u306e\u5229\u7528\u8005\u304c\u3044\u3064\u3069\u306e\u672c\u3092\u6301\u3063\u3066\u3044\u308b\u304b\u3092\u6b63\u78ba\u306b\u8ffd\u8de1\u3067\u304d\u3001\u672c\u3084\u5229\u7528\u8005\u306e\u30c7\u30fc\u30bf\u3092\u91cd\u8907\u3055\u305b\u308b\u3053\u3068\u306a\u304f\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udcdd 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\u3053\u306e\u5272\u308a\u5f53\u3066\u306f\u3044\u3064\u958b\u59cb\u3055\u308c\u307e\u3057\u305f\u304b\uff1f<\/li>\n<\/ul>\n<p>\u95a2\u4fc2\u3092\u5358\u306a\u308b2\u5024\u30d5\u30e9\u30b0\u3068\u3057\u3066\u6271\u3046\u3068\u3001\u3053\u306e\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u3092\u5931\u3046\u3053\u3068\u306b\u306a\u308b\u3002\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306f\u3001\u3053\u308c\u3089\u306e\u5c5e\u6027\u3092\u683c\u7d0d\u3059\u308b\u306e\u306b\u6700\u9069\u306a\u5834\u6240\u3068\u306a\u308b\u3002<\/p>\n<p><strong>\u5b9f\u88c5\u30eb\u30fc\u30eb\uff1a<\/strong><\/p>\n<ul>\n<li>\u95a2\u4fc2\u306e\u5c5e\u6027\u3092\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u683c\u7d0d\u3057\u3066\u306f\u306a\u3089\u306a\u3044\u3002\u305d\u308c\u3089\u306f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3060\u3051\u306e\u3082\u306e\u3067\u3082\u3001\u5f93\u696d\u54e1\u3060\u3051\u306e\u3082\u306e\u3067\u3082\u306a\u3044\u3002<\/li>\n<li>\u3059\u3079\u3066\u306e\u95a2\u4fc2\u56fa\u6709\u306e\u30c7\u30fc\u30bf\u3092\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306b\u914d\u7f6e\u3059\u308b\u3002<\/li>\n<li>\u3053\u308c\u3089\u306e\u5c5e\u6027\u3092\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u305a\u306b\u66f4\u65b0\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306b\u4e00\u610f\u306e\u8b58\u5225\u5b50\uff08\u8907\u5408\u307e\u305f\u306f\u4ee3\u66ff\uff09\u3092\u78ba\u4fdd\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u306e\u6b63\u898f\u5316\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u3002\u3082\u3057\u3001<code>\u5f79\u5272<\/code> \u5217\u3092 <strong>\u5f93\u696d\u54e1<\/strong> \u30c6\u30fc\u30d6\u30eb\u306b\u8ffd\u52a0\u3057\u305f\u5834\u5408\u3001\u5f93\u696d\u54e1\u304c\u7570\u306a\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u8907\u6570\u306e\u5f79\u5272\u3092\u6301\u3064\u3068\u3001\u91cd\u8907\u304c\u751f\u3058\u308b\u3002\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306f\u3053\u306e\u5909\u5316\u3092\u9694\u96e2\u3059\u308b\u3002<\/p>\n<h2>\u2696\ufe0f \u6280\u88533\uff1a\u6b63\u898f\u5316\u3068\u30c7\u30fc\u30bf\u6574\u5408\u6027<\/h2>\n<p>M:N\u95a2\u4fc2\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u306f\u3001\u5358\u306b\u30c6\u30fc\u30d6\u30eb\u3092\u30ea\u30f3\u30af\u3059\u308b\u3053\u3068\u3060\u3051\u3067\u306f\u306a\u3044\u3002\u30c7\u30fc\u30bf\u306e\u7570\u5e38\u3092\u9632\u3050\u305f\u3081\u306b\u6b63\u898f\u5316\u306e\u539f\u5247\u306b\u5f93\u3046\u3053\u3068\u304c\u91cd\u8981\u3067\u3042\u308b\u3002\u7b2c\u4e09\u6b63\u898f\u5f62\uff083NF\uff09\u306f\u3001\u307b\u3068\u3093\u3069\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u30b7\u30b9\u30c6\u30e0\u306e\u6a19\u6e96\u7684\u306a\u76ee\u6a19\u3067\u3042\u308b\u3002<\/p>\n<p><strong>\u7b2c\u4e09\u6b63\u898f\u5f62\uff083NF\uff09\u306e\u8981\u4ef6\uff1a<\/strong><\/p>\n<ul>\n<li>\u30c6\u30fc\u30d6\u30eb\u306f\u7b2c\u4e8c\u6b63\u898f\u5f62\uff082NF\uff09\u306b\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3002<\/li>\n<li>\u3059\u3079\u3066\u306e\u975e\u30ad\u30fc\u5c5e\u6027\u306f\u3001\u4e3b\u30ad\u30fc\u306b\u306e\u307f\u4f9d\u5b58\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<\/ul>\n<p>\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u4fc2\u30c7\u30fc\u30bf\u304c\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306e\u8907\u5408\u30ad\u30fc\u306b\u4f9d\u5b58\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u500b\u3005\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30ad\u30fc\u306b\u4f9d\u5b58\u3057\u306a\u304f\u306a\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u63a8\u79fb\u7684\u4f9d\u5b58\u304c\u6392\u9664\u3055\u308c\u308b\u3002<\/p>\n<p><strong>\u53c2\u7167\u6574\u5408\u6027\uff1a<\/strong><\/p>\n<p>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306f\u30b8\u30e7\u30a4\u30f3\u30c6\u30fc\u30d6\u30eb\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u3002\u4ee5\u4e0b\u306e\u30eb\u30fc\u30eb\u3092\u5f37\u5236\u3059\u308b\u3002<\/p>\n<ul>\n<li>\u3042\u308b <code>\u66f8\u7c4dID<\/code> \u306f\u8cb8\u51fa\u30ed\u30b0\u306b\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<strong>\u66f8\u7c4d<\/strong> \u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<li>A <code>Patron_ID<\/code>\u8cb8\u51fa\u30ed\u30b0\u5185\u306e<strong>Patrons<\/strong>\u30c6\u30fc\u30d6\u30eb\u306b\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u5b64\u7acb\u3057\u305f\u30ec\u30b3\u30fc\u30c9\u3092\u9632\u304e\u307e\u3059\u3002\u30ab\u30bf\u30ed\u30b0\u306b\u5b58\u5728\u3057\u306a\u3044\u672c\u306e\u8cb8\u51fa\u30a4\u30d9\u30f3\u30c8\u3092\u8a18\u9332\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306f\u3001\u524a\u9664\u6642\u306e<code>CASCADE<\/code>\u307e\u305f\u306f<code>RESTRICT<\/code>\u30a2\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u3053\u308c\u3092\u5f37\u5236\u3057\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udcca \u95a2\u4fc2\u30bf\u30a4\u30d7\u306e\u6bd4\u8f03<\/h2>\n<p>\u95a2\u4fc2\u30bf\u30a4\u30d7\u9593\u306e\u9055\u3044\u3092\u53ef\u8996\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u9069\u5207\u306a\u30e2\u30c7\u30ea\u30f3\u30b0\u6226\u7565\u3092\u9078\u629e\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u8868\u306f\u3001\u69cb\u9020\u7684\u8981\u4ef6\u3068\u5b9f\u88c5\u306e\u8907\u96d1\u3055\u3092\u8981\u7d04\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u95a2\u4fc2\u30bf\u30a4\u30d7<\/th>\n<th>\u7269\u7406\u7684\u5b9f\u88c5<\/th>\n<th>\u4e3b\u30ad\u30fc\u306e\u4f4d\u7f6e<\/th>\n<th>\u8907\u96d1\u3055<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1\u5bfe1 (1:1)<\/td>\n<td>1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5916\u90e8\u30ad\u30fc<\/td>\n<td>\u3069\u3061\u3089\u304b\u306e\u30c6\u30fc\u30d6\u30eb<\/td>\n<td>\u4f4e<\/td>\n<\/tr>\n<tr>\n<td>1\u5bfe\u591a (1:M)<\/td>\n<td>\u300c\u591a\u300d\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5916\u90e8\u30ad\u30fc<\/td>\n<td>\u4e3b\u30c6\u30fc\u30d6\u30eb<\/td>\n<td>\u4e2d<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u5bfe\u591a (M:N)<\/td>\n<td>\u5225\u3005\u306e\u7d50\u5408\u30c6\u30fc\u30d6\u30eb<\/td>\n<td>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\uff08\u8907\u5408\uff09<\/td>\n<td>\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u3054\u89a7\u306e\u901a\u308a\u3001M:N\u95a2\u4fc2\u306f\u6700\u3082\u5927\u304d\u306a\u69cb\u9020\u7684\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u5fc5\u8981\u3068\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u306f\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u30af\u30a8\u30ea\u4e2d\u306b\u8ffd\u52a0\u306e\u7d50\u5408\u3092\u884c\u3046\u30b3\u30b9\u30c8\u306f\u3001\u4e0d\u9069\u5207\u306a\u30b9\u30ad\u30fc\u30de\u8a2d\u8a08\u306b\u3088\u308b\u30c7\u30fc\u30bf\u4e0d\u6574\u5408\u306e\u30b3\u30b9\u30c8\u3088\u308a\u3082\u5e38\u306b\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\ud83d\ude80 \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u8003\u616e\u4e8b\u9805<\/h2>\n<p>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3092\u5c0e\u5165\u3059\u308b\u3068\u3001\u30af\u30a8\u30ea\u306b\u9593\u63a5\u6027\u306e\u5c64\u304c\u52a0\u308f\u308a\u307e\u3059\u3002\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u306f\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u306f\u306a\u304f3\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u9ad8\u8ca0\u8377\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u9069\u5207\u306b\u7ba1\u7406\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210\uff1a<\/strong>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u3059\u3079\u3066\u306e\u5916\u90e8\u30ad\u30fc\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306f\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u3092\u30b9\u30ad\u30e3\u30f3\u305b\u305a\u306b\u3001\u7279\u5b9a\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u884c\u3092\u8fc5\u901f\u306b\u691c\u7d22\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff1a<\/strong>\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u4e21\u65b9\u306e\u5916\u90e8\u30ad\u30fc\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f5c\u6210\u3059\u308b\u65b9\u304c\u3001\u500b\u5225\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3088\u308a\u3082\u52b9\u7387\u7684\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u4e21\u65b9\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u540c\u6642\u306b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u30af\u30a8\u30ea\u3092\u30b5\u30dd\u30fc\u30c8\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>\u8aad\u307f\u53d6\u308a vs. \u66f8\u304d\u8fbc\u307f\uff1a<\/strong>\u95a2\u4fc2\u304c\u52d5\u7684\u3067\u3042\u308b\u5834\u5408\u3001\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306f\u901a\u5e38\u3001\u66f8\u304d\u8fbc\u307f\u304c\u91cd\u3044\u3067\u3059\u3002\u30ec\u30dd\u30fc\u30c8\u3092\u751f\u6210\u3059\u308b\u969b\u306f\u8aad\u307f\u53d6\u308a\u304c\u91cd\u304f\u306a\u308a\u307e\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4e3b\u306a\u64cd\u4f5c\u30d1\u30bf\u30fc\u30f3\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<h2>\u26a0\ufe0f \u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/h2>\n<p>\u7d4c\u9a13\u8c4a\u5bcc\u306a\u30e2\u30c7\u30e9\u30fc\u3067\u3055\u3048\u3001\u57fa\u6570\u3092\u89e3\u6c7a\u3059\u308b\u969b\u306b\u30df\u30b9\u3092\u72af\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u8aa4\u308a\u306b\u6c17\u3065\u3044\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u5f8c\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u5927\u5e45\u306b\u7bc0\u7d04\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>1. \u300c1\u30ab\u30e9\u30e0\u300d\u306e\u8aa4\u308a<\/h3>\n<p>\u8907\u6570\u306eID\u3092\u3001\u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u5024\uff08\u4f8b\uff1a\u300c1, 2, 3\u300d\uff09\u3092\u4f7f\u3063\u30661\u3064\u306e\u30ab\u30e9\u30e0\u306b\u683c\u7d0d\u3057\u3088\u3046\u3068\u3059\u308b\u3002\u3053\u308c\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u539f\u5247\u306b\u9055\u53cd\u3057\u3001\u6587\u5b57\u5217\u30d1\u30fc\u30b9\u95a2\u6570\u3092\u4f7f\u308f\u306a\u3051\u308c\u3070\u30af\u30a8\u30ea\u304c\u4e0d\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u95a2\u4fc2\u306e\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u5bfe\u3057\u3066\u5e38\u306b\u5225\u3005\u306e\u884c\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>2. \u5197\u9577\u306a\u5c5e\u6027<\/h3>\n<p>\u5fc5\u8981\u304c\u306a\u3044\u306e\u306b\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5c5e\u6027\u3092\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306b\u30b3\u30d4\u30fc\u3059\u308b\u3053\u3068\u3002\u5c5e\u6027\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u5c5e\u3059\u308b\u5834\u5408\uff08\u4f8b\uff1a\u751f\u5f92\u306e\u540d\u524d\uff09\u3001\u305d\u308c\u306f\u751f\u5f92\u30c6\u30fc\u30d6\u30eb\u306b\u5c5e\u3059\u308b\u3079\u304d\u3067\u3042\u308a\u3001\u767b\u9332\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u5c5e\u3057\u307e\u305b\u3093\u3002\u30ea\u30f3\u30af\u81ea\u4f53\u3092\u8aac\u660e\u3059\u308b\u30c7\u30fc\u30bf\u3060\u3051\u3092\u8a18\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>3. NULL\u8a31\u5bb9\u6027\u306e\u7121\u8996<\/h3>\n<p>\u5fc5\u9808\u3067\u3042\u308b\u3079\u304d\u5916\u90e8\u30ad\u30fc\u3092NULL\u3092\u8a31\u5bb9\u3059\u308b\u3088\u3046\u306b\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3002\u95a2\u4fc2\u304c\u5fc5\u9808\u306e\u5834\u5408\uff08\u4f8b\uff1a\u6ce8\u6587\u306b\u306f\u9867\u5ba2\u304c\u5fc5\u9808\uff09\u3001\u5916\u90e8\u30ad\u30fc\u306fNULL\u5024\u3092\u8a31\u5bb9\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30ec\u30d9\u30eb\u3067\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3092\u5f37\u5236\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>4. \u5186\u5f62\u53c2\u7167<\/h3>\n<p>\u4e0d\u8981\u306b\u81ea\u5206\u81ea\u8eab\u3092\u53c2\u7167\u3059\u308b\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3002\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u304c\u95a2\u4fc2\u306b\u53c2\u52a0\u3059\u308b2\u3064\u306e\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u307f\u3092\u30ea\u30f3\u30af\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6a5f\u80fd\u7684\u306a\u76ee\u7684\u3092\u6301\u305f\u306a\u3044\u30eb\u30fc\u30d7\u3092\u4f5c\u6210\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\ud83c\udfa8 \u8996\u899a\u7684\u8868\u73fe\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<p>ERD\u3092\u6587\u66f8\u5316\u3059\u308b\u969b\u3001\u660e\u78ba\u3055\u304c\u6700\u3082\u91cd\u8981\u3067\u3059\u3002\u8996\u899a\u7684\u8868\u73fe\u306f\u3001\u56f3\u3092\u8aad\u3080\u8ab0\u306b\u3067\u3082\u5373\u5ea7\u306b\u89e3\u6c7a\u3055\u308c\u305f\u69cb\u9020\u3092\u4f1d\u3048\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306b\u30e9\u30d9\u30eb\u3092\u4ed8\u3051\u308b\uff1a<\/strong>\u30c6\u30fc\u30d6\u30eb\u540d\u306f\u8aac\u660e\u7684\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u300cTable3\u300d\u3067\u306f\u306a\u304f\u3001\u300cStudent_Course_Enrollment\u300d\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li><strong>\u57fa\u6570\u3092\u793a\u3059\uff1a<\/strong>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3068\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u3064\u306a\u3050\u7dda\u3092\u660e\u78ba\u306b\u30de\u30fc\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u5074\u306b\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u8996\u70b9\u304b\u3089\u898b\u305f\u300c\u591a\u6570\u300d\u306e\u95a2\u4fc2\u3092\u793a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li><strong>\u5c5e\u6027\u3092\u8868\u793a\u3059\u308b\uff1a<\/strong>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306b\u5c5e\u6027\uff08\u4f8b\uff1a\u300c\u6210\u7e3e\u300d\u3084\u300c\u65e5\u4ed8\u300d\uff09\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u56f3\u306b\u660e\u793a\u7684\u306b\u30ea\u30b9\u30c8\u30a2\u30c3\u30d7\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u95a2\u4fc2\u304c\u5358\u306a\u308b\u30ea\u30f3\u30af\u4ee5\u4e0a\u306e\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u304c\u5f37\u8abf\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u7570\u306a\u308b\u7dda\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u4f7f\u7528\u3059\u308b\uff1a<\/strong>\u4e00\u90e8\u306e\u30e2\u30c7\u30ea\u30f3\u30b0\u30c4\u30fc\u30eb\u3067\u306f\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u95a2\u4fc2\u306b\u7834\u7dda\u3001\u5fc5\u9808\u306e\u95a2\u4fc2\u306b\u5b9f\u7dda\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306e\u4e00\u8cab\u6027\u306f\u7406\u89e3\u3092\u52a9\u3051\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udd04 \u518d\u5e30\u7684\u95a2\u4fc2\u3068M:N<\/h2>\n<p>\u6642\u6298\u30011\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u5185\u306b\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001<strong>\u5f93\u696d\u54e1<\/strong> \u306f\u8907\u6570\u306e\u4ed6\u306e\u3082\u306e\u3092\u7ba1\u7406\u3067\u304d\u307e\u3059 <strong>\u5f93\u696d\u54e1<\/strong>\u3001\u305d\u3057\u3066\u305d\u306e\u5f93\u696d\u54e1\u306f\u4ed6\u306e\u4eba\u3092\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u518d\u5e30\u7684\u306aM:N\u95a2\u4fc2\u3067\u3059\u3002<\/p>\n<p>\u89e3\u6c7a\u65b9\u6cd5\u306f\u6a19\u6e96\u7684\u306aM:N\u95a2\u4fc2\u3068\u540c\u69d8\u3067\u3059\u3002\u4f9d\u7136\u3068\u3057\u3066\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u304c\u3001\u305d\u306e\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u4e21\u65b9\u306e\u5916\u90e8\u30ad\u30fc\u306f\u3001\u540c\u3058\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong> \u5f93\u696d\u54e1<\/li>\n<li><strong>\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\uff1a<\/strong> \u5f93\u696d\u54e1\u7ba1\u7406<\/li>\n<li><strong>\u5916\u90e8\u30ad\u30fc1\uff1a<\/strong> 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