{"id":1709,"date":"2026-04-11T23:27:53","date_gmt":"2026-04-11T23:27:53","guid":{"rendered":"https:\/\/www.viz-note.com\/ja\/myth-busting-one-to-many-relationships-erd\/"},"modified":"2026-04-11T23:27:53","modified_gmt":"2026-04-11T23:27:53","slug":"myth-busting-one-to-many-relationships-erd","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/ja\/myth-busting-one-to-many-relationships-erd\/","title":{"rendered":"\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306b\u304a\u3051\u308b1\u5bfe\u591a\u95a2\u4fc2\u306b\u95a2\u3059\u308b\u4e00\u822c\u7684\u306a\u8aa4\u89e3\u3092\u89e3\u304d\u307b\u3050\u3059"},"content":{"rendered":"<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u57fa\u76e4\u3068\u306a\u308b\u8a2d\u8a08\u56f3\u3067\u3059\u3002\u62bd\u8c61\u7684\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u3001\u30b7\u30b9\u30c6\u30e0\u304c\u51e6\u7406\u3067\u304d\u308b\u69cb\u9020\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u3053\u306e\u6587\u8108\u306b\u304a\u3044\u3066\u30011\u5bfe\u591a\u95a2\u4fc2\u306f\u6700\u3082\u4e00\u822c\u7684\u306a\u69cb\u9020\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u5b9f\u88c5\u3001\u57fa\u6570\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u306b\u3064\u3044\u3066\u5e83\u304f\u8aa4\u89e3\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u4fc2\u306e\u5fae\u7d30\u306a\u70b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u5805\u7262\u3067\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306a\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u69cb\u7bc9\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<p>\u591a\u304f\u306e\u5b9f\u52d9\u8005\u304c\u3001\u7c21\u7565\u5316\u3055\u308c\u305f\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3084\u53e4\u304f\u306a\u3063\u305f\u624b\u6cd5\u304b\u3089\u5f97\u305f\u5148\u5165\u89b3\u3092\u3082\u3063\u3066\u30c7\u30fc\u30bf\u30e2\u30c7\u30ea\u30f3\u30b0\u306b\u81e8\u307f\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u524d\u63d0\u306f\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306e\u5f8c\u534a\u306b\u81f3\u3063\u3066\u975e\u52b9\u7387\u3001\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u554f\u984c\u3001\u307e\u305f\u306f\u53d6\u308a\u6271\u3044\u304c\u96e3\u3057\u3044\u4fdd\u5b88\u30b5\u30a4\u30af\u30eb\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u30ac\u30a4\u30c9\u3067\u306f\u30011\u5bfe\u591a\u95a2\u4fc2\u306b\u95a2\u3059\u308b\u4e00\u822c\u7684\u306a\u8aa4\u89e3\u3092\u89e3\u304d\u660e\u304b\u3057\u307e\u3059\u3002\u7279\u5b9a\u306e\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30d9\u30f3\u30c0\u30fc\u306b\u4f9d\u5b58\u305b\u305a\u306b\u3001\u57fa\u6570\u3001\u5916\u90e8\u30ad\u30fc\u3001\u6b63\u898f\u5316\u306e\u6280\u8853\u7684\u73fe\u5b9f\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Hand-drawn infographic debunking 5 common myths about one-to-many relationships in Entity Relationship Diagrams (ERDs): illustrates core concepts of parent\/child entities and cardinality, clarifies misconceptions about hierarchy dependency, foreign key uniqueness, relationship evolution, performance impact, and many-to-many confusion, plus best practices for naming conventions, referential integrity, normalization, indexing strategies, and soft delete handling for database architects and developers\" decoding=\"async\" src=\"https:\/\/www.viz-note.com\/wp-content\/uploads\/2026\/04\/one-to-many-erd-relationships-myths-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83e\uddd0 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1\u3064\u306e<em>\u9867\u5ba2<\/em>\u306f\u3001<em>\u6ce8\u6587<\/em>\u306a\u3057\u3067\u5b58\u5728\u3067\u304d\u307e\u3059\u3002\u9867\u5ba2\u30c6\u30fc\u30d6\u30eb\u306f\u72ec\u7acb\u3057\u3066\u3044\u307e\u3059\u3002\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306f\u9867\u5ba2\u3092\u53c2\u7167\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u8b58\u5225\u7684\uff1a<\/strong> 1\u3064\u306e<em>\u6ce8\u6587\u9805\u76ee<\/em>\u306f\u3001<em>\u6ce8\u6587<\/em>\u306a\u3057\u3067\u306f\u5b58\u5728\u3067\u304d\u307e\u305b\u3093\u3002\u6ce8\u6587\u9805\u76ee\u30c6\u30fc\u30d6\u30eb\u306f\u3001\u6ce8\u6587ID\u3092\u4e3b\u30ad\u30fc\u306e\u4e00\u90e8\u3068\u3057\u3066\u5171\u6709\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u5b58\u5728\u3057\u306a\u3044\u53b3\u683c\u306a\u968e\u5c64\u69cb\u9020\u3092\u524d\u63d0\u3068\u3059\u308b\u3068\u3001\u4e0d\u8981\u306a\u5236\u7d04\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u4f9d\u5b58\u95a2\u4fc2\u306e\u306a\u3044\u95a2\u4fc2\u306b\u300c<code>CASCADE DELETE<\/code>\u300d\u3092\u9069\u7528\u3059\u308b\u3068\u3001\u6b63\u5f53\u306a\u30c7\u30fc\u30bf\u304c\u8aa4\u3063\u3066\u524a\u9664\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u53b3\u683c\u306a\u53c2\u7167\u6574\u5408\u6027\u5236\u7d04\u3092\u9069\u7528\u3059\u308b\u524d\u306b\u3001\u5fc5\u305a\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u274c \u30df\u30b9\u30ea\u30fc\u30c92\uff1a\u5916\u90e8\u30ad\u30fc\u306f\u5fc5\u305a\u4e00\u610f\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/h2>\n<p>\u5916\u90e8\u30ad\u30fc\u5217\u306e\u4e00\u610f\u6027\u5236\u7d04\u306b\u3064\u3044\u3066\u6df7\u4e71\u304c\u751f\u3058\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u306b\u304a\u3051\u308b\u5916\u90e8\u30ad\u30fc\u306f\u3001\u660e\u78ba\u306b\u300c<strong>\u975e\u4e00\u610f<\/strong>\u300d\u3067\u3042\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udd0d \u6975\u6027\u5236\u7d04\u306e\u771f\u5b9f<\/h3>\n<p>\u89aa\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u306f\u4e00\u610f\u3067\u3059\u3002\u5b50\u30c6\u30fc\u30d6\u30eb\u306e\u5916\u90e8\u30ad\u30fc\u306f\u3001\u305d\u306e\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3057\u307e\u3059\u30021\u3064\u306e\u89aa\u304c\u8907\u6570\u306e\u5b50\u3068\u95a2\u9023\u3059\u308b\u305f\u3081\u3001\u5916\u90e8\u30ad\u30fc\u306e\u5024\u306f\u7e70\u308a\u8fd4\u3055\u308c\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5916\u90e8\u30ad\u30fc\u304c\u4e00\u610f\u3067\u3042\u308c\u3070\u3001\u95a2\u4fc2\u306f1\u5bfe1\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u5074\u9762<\/th>\n<th>1\u5bfe1<\/th>\n<th>1\u5bfe\u591a<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5916\u90e8\u30ad\u30fc\u306e\u4e00\u610f\u6027<\/td>\n<td>\u4e00\u610f<\/td>\n<td>\u4e00\u610f\u3067\u306a\u3044<\/td>\n<\/tr>\n<tr>\n<td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565<\/td>\n<td>\u3057\u3070\u3057\u3070\u4e00\u610f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td>\n<td>\u6a19\u6e96\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u306e\u91cd\u8907<\/td>\n<td>\u4f4e<\/td>\n<td>\u9ad8\u3044\uff08\u8a2d\u8a08\u4e0a\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5916\u90e8\u30ad\u30fc\u304c\u4e00\u610f\u3067\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u3053\u3068\u306f\u91cd\u8981\u3067\u3042\u308b\u3002\u30b7\u30b9\u30c6\u30e0\u304c\u5b50\u5074\u3067\u4e00\u610f\u6027\u3092\u5f37\u5236\u3059\u308b\u3068\u3001\u30e2\u30c7\u30eb\u306f\u5358\u4e00\u306e\u95a2\u9023\u306b\u9650\u5b9a\u3055\u308c\u3001\u610f\u56f3\u3057\u305f\u30c7\u30fc\u30bf\u69cb\u9020\u304c\u7834\u58ca\u3055\u308c\u308b\u3002\u3053\u308c\u306f\u81ea\u52d5\u5316\u3055\u308c\u305f\u30e2\u30c7\u30eb\u4f5c\u6210\u30c4\u30fc\u30eb\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u8a2d\u5b9a\u30df\u30b9\u3067\u3042\u308b\u3002<\/p>\n<h2>\u274c \u30df\u30b9\u30ea\u30fc\u30c93\uff1a\u95a2\u4fc2\u306f\u9759\u7684\u3067\u3042\u308b<\/h2>\n<p>\u591a\u304f\u306e\u30c7\u30b6\u30a4\u30ca\u30fc\u306f\u3001\u56f3\u9762\u4e0a\u30671\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u5b9a\u7fa9\u3055\u308c\u308b\u3068\u3001\u305d\u308c\u4ee5\u964d\u5909\u66f4\u3067\u304d\u306a\u3044\u3068\u4eee\u5b9a\u3057\u3066\u3044\u308b\u3002\u3057\u304b\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306f\u30d3\u30b8\u30cd\u30b9\u306e\u5909\u5316\u306b\u5408\u308f\u305b\u3066\u9032\u5316\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u9759\u7684\u95a2\u4fc2\u3068\u3044\u3046\u524d\u63d0\u306f\u3001\u30c7\u30fc\u30bf\u306e\u52d5\u7684\u306a\u6027\u8cea\u3092\u7121\u8996\u3057\u3066\u3044\u308b\u3002<\/p>\n<h3>\ud83d\udd0d \u30e2\u30c7\u30eb\u9032\u5316\u306e\u73fe\u5b9f<\/h3>\n<p>\u30d3\u30b8\u30cd\u30b9\u8981\u4ef6\u306f\u5909\u5316\u3059\u308b\u3002\u88fd\u54c1\u306f\u5f53\u521d\u306f1\u3064\u306e\u30ab\u30c6\u30b4\u30ea\u306b\u5c5e\u3059\u308b\u304c\u3001\u5f8c\u306b1\u88fd\u54c1\u3042\u305f\u308a\u8907\u6570\u306e\u30ab\u30c6\u30b4\u30ea\u3092\u8a31\u53ef\u3059\u308b\u3088\u3046\u30d3\u30b8\u30cd\u30b9\u304c\u62e1\u5927\u3059\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30e2\u30c7\u30eb\u306f1\u5bfe\u591a\u304b\u3089\u591a\u5bfe\u591a\u306b\u5909\u5316\u3059\u308b\u3002<\/p>\n<ul>\n<li><strong>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u30ea\u30b9\u30af\uff1a<\/strong>\u95a2\u4fc2\u306e\u30bf\u30a4\u30d7\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u3001\u30c7\u30fc\u30bf\u79fb\u884c\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u4f5c\u6210\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/li>\n<li><strong>\u5f8c\u65b9\u4e92\u63db\u6027\uff1a<\/strong>\u53e4\u3044\u30ec\u30dd\u30fc\u30c8\u306f\u5143\u306e\u69cb\u9020\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\uff1a<\/strong>\u30b9\u30ad\u30fc\u30de\u5909\u66f4\u306e\u5c65\u6b74\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u306f\u3001\u9577\u671f\u7684\u306a\u5b89\u5b9a\u6027\u306b\u3068\u3063\u3066\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u3002<\/li>\n<\/ul>\n<p>\u30c7\u30b6\u30a4\u30ca\u30fc\u306f\u5c06\u6765\u306e\u6210\u9577\u3092\u898b\u8d8a\u3059\u3079\u304d\u3067\u3042\u308b\u3002\u73fe\u5728\u306f1\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u6a19\u6e96\u7684\u3060\u304c\u3001\u30b9\u30ad\u30fc\u30de\u306f\u67d4\u8edf\u6027\u3092\u8a31\u5bb9\u3059\u3079\u304d\u3067\u3042\u308b\u3002\u5916\u90e8\u30ad\u30fc\u3068\u3057\u3066\u64ec\u4f3c\u30ad\u30fc\uff08\u81ea\u52d5\u5897\u5206ID\uff09\u3092\u81ea\u7136\u30ad\u30fc\uff08\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306a\u3069\uff09\u3088\u308a\u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u79fb\u884c\u3092\u5bb9\u6613\u306b\u3059\u308b\u5834\u5408\u304c\u591a\u3044\u3002<\/p>\n<h2>\u274c \u30df\u30b9\u30ea\u30fc\u30c94\uff1a\u5916\u90e8\u30ad\u30fc\u306b\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30b3\u30b9\u30c8\u304c\u306a\u3044<\/h2>\n<p>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u8ad6\u7406\u7684\u306a\u76ee\u7684\u306e\u305f\u3081\u3067\u3042\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u307b\u3068\u3093\u3069\u5f71\u97ff\u304c\u306a\u3044\u3068\u3044\u3046\u8003\u3048\u304c\u3042\u308b\u3002\u3057\u304b\u3057\u5b9f\u969b\u306b\u306f\u3001\u3059\u3079\u3066\u306e\u5236\u7d04\u306f\u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\u4e2d\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u304c\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<h3>\ud83d\udd0d \u66f8\u304d\u8fbc\u307f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u73fe\u5b9f<\/h3>\n<p>\u5b50\u30c6\u30fc\u30d6\u30eb\u306b\u30ec\u30b3\u30fc\u30c9\u3092\u633f\u5165\u3059\u308b\u969b\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u53c2\u7167\u3055\u308c\u308b\u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u3053\u308c\u306f\u7167\u5408\u64cd\u4f5c\u3092\u4f34\u3046\u3002\u9ad8\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u3053\u306e\u7167\u5408\u304c\u9045\u5ef6\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/p>\n<ul>\n<li><strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u5217\u306f\u691c\u8a3c\u30d7\u30ed\u30bb\u30b9\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u5f35\u308b\u3079\u304d\u3067\u3042\u308b\u3002<\/li>\n<li><strong>\u30ed\u30c3\u30af\uff1a<\/strong>\u53c2\u7167\u6574\u5408\u6027\u30c1\u30a7\u30c3\u30af\u306b\u306f\u89aa\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u30ed\u30c3\u30af\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u30ab\u30b9\u30b1\u30fc\u30c9\u64cd\u4f5c\uff1a<\/strong>\u3082\u3057 <code>\u30ab\u30b9\u30b1\u30fc\u30c9\u524a\u9664<\/code>\u304c\u6709\u52b9\u306a\u5834\u5408\u3001\u89aa\u30ec\u30b3\u30fc\u30c9\u306e\u524a\u9664\u306b\u3088\u308a\u8907\u6570\u306e\u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u3001\u30ea\u30bd\u30fc\u30b9\u3092\u5927\u91cf\u306b\u6d88\u8cbb\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u30a4\u30f3\u30b8\u30a7\u30b9\u30c8\u3092\u4f34\u3046\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u4e00\u90e8\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u304c\u4e00\u6642\u7684\u306b\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u3092\u7121\u52b9\u306b\u3057\u3066\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u306b\u3088\u308a\u30c7\u30fc\u30bf\u306e\u7834\u640d\u30ea\u30b9\u30af\u304c\u751f\u3058\u307e\u3059\u3002\u6574\u5408\u6027\u3068\u901f\u5ea6\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u306f\u3001\u5177\u4f53\u7684\u306a\u4f7f\u7528\u72b6\u6cc1\u306b\u57fa\u3065\u3044\u3066\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u274c \u30df\u30b9\u30b3\u30f3\u30bb\u30d7\u30b7\u30e7\u30f35\uff1a1\u5bfe\u591a\u306f\u591a\u5bfe\u591a\u3068\u540c\u3058\u3067\u3042\u308b<\/h2>\n<p>\u5b9f\u52d9\u8005\u306e\u4e2d\u306b\u306f\u30011\u5bfe\u591a\u3068\u591a\u5bfe\u591a\u306e\u8996\u899a\u7684\u8868\u73fe\u3092\u6df7\u540c\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u9ad8\u30ec\u30d9\u30eb\u306e\u56f3\u3067\u306f\u898b\u305f\u76ee\u304c\u4f3c\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u5b9f\u88c5\u65b9\u6cd5\u306f\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udd0d \u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u306e\u771f\u5b9f<\/h3>\n<p>\u771f\u306e\u591a\u5bfe\u591a\u95a2\u4fc2\u306b\u306f\u3001\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\uff08\u3057\u3070\u3057\u3070\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3084\u30d6\u30ea\u30c3\u30b8\u30c6\u30fc\u30d6\u30eb\u3068\u547c\u3070\u308c\u308b\uff09\u304c\u5fc5\u8981\u3067\u3059\u30021\u5bfe\u591a\u95a2\u4fc2\u306b\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>1\u5bfe\u591a\uff1a<\/strong>\u5b50\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5916\u90e8\u30ad\u30fc\u3092\u4ecb\u3057\u305f\u76f4\u63a5\u30ea\u30f3\u30af\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\uff1a<\/strong>\u4e21\u65b9\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3078\u306e\u5916\u90e8\u30ad\u30fc\u3092\u542b\u3080\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>1\u3064\u306e\u5916\u90e8\u30ad\u30fc\u5217\u3092\u4f7f\u3063\u3066\u591a\u5bfe\u591a\u306e\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3084\u640d\u5931\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Student\u30c6\u30fc\u30d6\u30eb\u306b\u300ccourse_id\u300d\u3060\u3051\u3092\u7528\u3044\u3066Student\u3092\u8907\u6570\u306eCourse\u306b\u30ea\u30f3\u30af\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30011\u4eba\u306e\u5b66\u751f\u306f1\u3064\u306e\u30b3\u30fc\u30b9\u3057\u304b\u53d7\u8b1b\u3067\u304d\u307e\u305b\u3093\u3002\u8907\u6570\u306e\u53d7\u8b1b\u3092\u8a31\u53ef\u3059\u308b\u306b\u306f\u3001\u300cEnrollment\u300d\u30c6\u30fc\u30d6\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002<code>course_id<\/code>\u3092Student\u30c6\u30fc\u30d6\u30eb\u306b\u8a2d\u7f6e\u3059\u308b\u3068\u30011\u4eba\u306e\u5b66\u751f\u306f1\u3064\u306e\u30b3\u30fc\u30b9\u3057\u304b\u53d7\u8b1b\u3067\u304d\u307e\u305b\u3093\u3002\u8907\u6570\u306e\u53d7\u8b1b\u3092\u8a31\u53ef\u3059\u308b\u306b\u306f\u3001<code>Enrollment<\/code>\u30c6\u30fc\u30d6\u30eb\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>\ud83d\udee0\ufe0f \u5b9f\u88c5\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<p>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u5b88\u308b\u3053\u3068\u3067\u30011\u5bfe\u591a\u95a2\u4fc2\u304c\u5805\u7262\u306a\u72b6\u614b\u3092\u4fdd\u3061\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u306f\u69cb\u9020\u3001\u547d\u540d\u3001\u6574\u5408\u6027\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udcdd \u547d\u540d\u898f\u5247<\/h3>\n<p>\u4e00\u8cab\u3057\u305f\u547d\u540d\u306f\u66d6\u6627\u3055\u3092\u6e1b\u3089\u3057\u307e\u3059\u3002\u5916\u90e8\u30ad\u30fc\u306f\u95a2\u4fc2\u3092\u660e\u78ba\u306b\u793a\u3059\u3079\u304d\u3067\u3059\u3002\u300c<code>author_id<\/code>\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u30ab\u30e9\u30e0\u306f\u3001\u300c<code>auth_id<\/code>.<\/p>\n<ul>\n<li><strong>\u6a19\u6e96\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff1a<\/strong> <code>parent_table_singular<\/code>_id\u3002<\/li>\n<li><strong>\u4e00\u8cab\u6027\uff1a<\/strong> \u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u3059\u3079\u3066\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u9069\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li><strong>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u306e\u533a\u5225\uff1a<\/strong>\u7570\u306a\u308b\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u306e\u533a\u5225\u306b\u95a2\u3059\u308b\u554f\u984c\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u5c0f\u6587\u5b57\u307e\u305f\u306f\u5927\u6587\u5b57\u306e\u3069\u3061\u3089\u304b\u306b\u7d71\u4e00\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd12 \u53c2\u7167\u6574\u5408\u6027<\/h3>\n<p>\u6574\u5408\u6027\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u3067\u3001\u5b64\u7acb\u3057\u305f\u30ec\u30b3\u30fc\u30c9\u3092\u9632\u304e\u307e\u3059\u3002\u5b64\u7acb\u3057\u305f\u30ec\u30b3\u30fc\u30c9\u3068\u306f\u3001\u5b58\u5728\u3057\u306a\u304f\u306a\u3063\u305f\u89aa\u30ec\u30b3\u30fc\u30c9\u3092\u6307\u3059\u5b50\u30ec\u30b3\u30fc\u30c9\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>ON DELETE RESTRICT\uff1a<\/strong>\u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u89aa\u30ec\u30b3\u30fc\u30c9\u306e\u524a\u9664\u3092\u7981\u6b62\u3057\u307e\u3059\u3002<\/li>\n<li><strong>ON DELETE CASCADE\uff1a<\/strong>\u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u305f\u3068\u304d\u306b\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u3082\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>ON DELETE SET NULL\uff1a<\/strong>\u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001\u5916\u90e8\u30ad\u30fc\u3092NULL\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u9069\u5207\u306a\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u9078\u629e\u3059\u308b\u306b\u306f\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8981\u5ea6\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u91d1\u878d\u53d6\u5f15\u306e\u5834\u5408\u306f\u3001<code>RESTRICT<\/code>\u304c\u901a\u5e38\u3088\u308a\u5b89\u5168\u3067\u3059\u3002\u4e00\u6642\u7684\u306a\u30ed\u30b0\u306e\u5834\u5408\u306f\u3001<code>CASCADE<\/code>\u8a31\u5bb9\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u2699\ufe0f \u6b63\u898f\u5316\u30681\u5bfe\u591a<\/h2>\n<p>\u6b63\u898f\u5316\u3068\u306f\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3092\u6574\u7406\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u3001\u6b63\u898f\u5316\u3092\u9054\u6210\u3059\u308b\u305f\u3081\u306e\u4e3b\u306a\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3059\u3002<\/p>\n<h3>\ud83d\udcca \u7b2c2\u6b63\u898f\u5f62\uff082NF\uff09<\/h3>\n<p>2NF\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u975e\u30ad\u30fc\u5c5e\u6027\u304c\u4e3b\u30ad\u30fc\u306b\u5b8c\u5168\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u3001\u7e70\u308a\u8fd4\u3057\u30b0\u30eb\u30fc\u30d7\u3092\u5206\u96e2\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u30c6\u30fc\u30d6\u30eb\u306b\u9805\u76ee\u306e\u30ea\u30b9\u30c8\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u30ea\u30b9\u30c8\u3092\u5225\u30c6\u30fc\u30d6\u30eb\u306b\u79fb\u52d5\u3059\u308b\u3053\u3068\u3067\u30011\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u4f5c\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u524d\uff1a<\/strong> 1\u884c\u306b\u8907\u6570\u306e\u88fd\u54c1\u540d\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u5f8c\uff1a<\/strong> \u88fd\u54c1\u540d\u304c\u88fd\u54c1ID\u3067\u30ea\u30f3\u30af\u3055\u308c\u305f\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u5206\u96e2\u306b\u3088\u308a\u3001\u88fd\u54c1\u540d\u306e\u66f4\u65b0\u306f1\u884c\u306e\u307f\u3092\u5909\u66f4\u3059\u308c\u3070\u6e08\u307f\u3001\u540d\u524d\u304c\u7e70\u308a\u8fd4\u3057\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u8907\u6570\u884c\u3092\u66f4\u65b0\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udcca \u7b2c3\u6b63\u898f\u5f62\uff083NF\uff09<\/h3>\n<p>3NF\u3067\u306f\u3001\u63a8\u79fb\u7684\u4f9d\u5b58\u95a2\u4fc2\u3092\u6392\u9664\u3057\u307e\u3059\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u3001\u975e\u30ad\u30fc\u5c5e\u6027\u304c\u4ed6\u306e\u975e\u30ad\u30fc\u5c5e\u6027\u3067\u306f\u306a\u304f\u3001\u4e3b\u30ad\u30fc\u306b\u306e\u307f\u4f9d\u5b58\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30c6\u30fc\u30d6\u30eb\u306b<code>EmployeeID<\/code>, <code>\u90e8\u9580ID<\/code>\u3001\u305d\u3057\u3066<code>\u90e8\u9580\u540d<\/code>\u3001\u63a8\u79fb\u7684\u4f9d\u5b58\u95a2\u4fc2\uff08\u5f93\u696d\u54e1 \u2192 \u90e8\u9580 \u2192 \u90e8\u9580\u540d\uff09\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092<em>\u5f93\u696d\u54e1<\/em>\u30c6\u30fc\u30d6\u30eb\u3068<em>\u90e8\u9580<\/em>\u30c6\u30fc\u30d6\u30eb\u306b\u5206\u5272\u3059\u308b\u3053\u3068\u3067\u30011\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u69cb\u7bc9\u3055\u308c\u3001\u4f9d\u5b58\u95a2\u4fc2\u304c\u89e3\u6d88\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udea7 \u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74<\/h2>\n<p>\u8a2d\u8a08\u6bb5\u968e\u3067\u306e\u8aa4\u308a\u3092\u907f\u3051\u308b\u3053\u3068\u3067\u3001\u958b\u767a\u6bb5\u968e\u3067\u306e\u6642\u9593\u3092\u5927\u5e45\u306b\u7bc0\u7d04\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u843d\u3068\u3057\u7a74\u306f\u983b\u7e41\u306b\u898b\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u904e\u5270\u306a\u6b63\u898f\u5316\uff1a<\/strong>\u30c6\u30fc\u30d6\u30eb\u3092\u591a\u3059\u304e\u308b\u3068\u30af\u30a8\u30ea\u304c\u8907\u96d1\u306b\u306a\u308a\u307e\u3059\u3002\u6b63\u898f\u5316\u3068\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/li>\n<li><strong>\u5916\u90e8\u30ad\u30fc\u306e\u6b20\u843d\uff1a<\/strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u306b\u95a2\u4fc2\u306e\u5f37\u5236\u3092\u4f9d\u5b58\u3059\u308b\u306e\u306f\u5371\u967a\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5236\u7d04\u304c\u771f\u5b9f\u306e\u57fa\u6e96\u3067\u3059\u3002<\/li>\n<li><strong>\u4e0d\u9069\u5207\u306aNULL\u8a31\u5bb9\u6027\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u306f\u901a\u5e38<code>NOT NULL<\/code>\u3001\u95a2\u4fc2\u304c\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u5834\u5408\u3092\u9664\u304d\u307e\u3059\u3002<code>NULL<\/code>\u5916\u90e8\u30ad\u30fc\u304cNULL\u3067\u3042\u308b\u3053\u3068\u306f\u3001\u95a2\u4fc2\u304c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u3001\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u306b\u9055\u53cd\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u578b\u306e\u4e0d\u4e00\u81f4\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u578b\u304c\u4e3b\u30ad\u30fc\u3068\u6b63\u78ba\u306b\u4e00\u81f4\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u65b9\u3067VARCHAR\u3092\u4f7f\u7528\u3057\u3001\u4ed6\u65b9\u3067INT\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30ea\u30f3\u30af\u304c\u58ca\u308c\u307e\u3059\u3002<code>VARCHAR<\/code>\u4e00\u65b9\u3067<code>INT<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30ea\u30f3\u30af\u304c\u58ca\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcc9 ERD\u306b\u304a\u3051\u308b\u8996\u899a\u7684\u8868\u73fe<\/h2>\n<p>\u56f3\u306e\u660e\u78ba\u3055\u306f\u3001\u305d\u306e\u80cc\u5f8c\u306b\u3042\u308b\u8ad6\u7406\u3068\u540c\u3058\u304f\u3089\u3044\u91cd\u8981\u3067\u3059\u3002\u8996\u899a\u7684\u8a18\u6cd5\u306f\u3001\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u306a\u3044\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306b\u69cb\u9020\u3092\u4f1d\u3048\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udc63 \u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u8a18\u6cd5<\/h3>\n<p>\u3053\u308c\u306f\u6700\u3082\u4e00\u822c\u7684\u306a\u6a19\u6e96\u3067\u3059\u3002<em>1\u3064<\/em>\u5074\u306b\u306f\u5358\u4e00\u306e\u5782\u76f4\u7dda\u304c\u3042\u308a\u307e\u3059\u3002<em>\u591a\u6570<\/em>\u5074\u306b\u306f\u30ab\u30e9\u30b9\u306e\u8db3\uff083\u672c\u306e\u5206\u5c90\u7dda\uff09\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5186\uff1a<\/strong>\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u95a2\u4fc2\uff080..N\uff09\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u7dda\uff1a<\/strong>\u5fc5\u9808\u306e\u95a2\u4fc2\uff081..N\uff09\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udcd0 \u30c1\u30a7\u30f3\u8a18\u6cd5<\/h3>\n<p>\u95a2\u4fc2\u306b\u306f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u578b\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u73fe\u4ee3\u306e\u30c4\u30fc\u30eb\u3067\u306f\u3042\u307e\u308a\u4f7f\u308f\u308c\u307e\u305b\u3093\u304c\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u306e\u63a5\u7d9a\u306e\u660e\u78ba\u306a\u6982\u5ff5\u7684\u8996\u70b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udd04 \u30bd\u30d5\u30c8\u524a\u9664\u306e\u51e6\u7406<\/h2>\n<p>\u591a\u304f\u306e\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u30c7\u30fc\u30bf\u306f\u307e\u3063\u305f\u304f\u524a\u9664\u3055\u308c\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u3068\u3057\u3066\u30de\u30fc\u30af\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u30bd\u30d5\u30c8\u524a\u9664\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udd0d \u95a2\u4fc2\u3078\u306e\u5f71\u97ff<\/h3>\n<p>\u30bd\u30d5\u30c8\u524a\u9664\u306f1\u5bfe\u591a\u306e\u95a2\u4fc2\u3092\u8907\u96d1\u306b\u3057\u307e\u3059\u3002\u89aa\u304c\u30bd\u30d5\u30c8\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001\u5b50\u306f\u30ea\u30f3\u30af\u3055\u308c\u305f\u307e\u307e\u306b\u3059\u308b\u3079\u304d\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<ul>\n<li><strong>\u30aa\u30d7\u30b7\u30e7\u30f31\uff1a<\/strong>\u30bd\u30d5\u30c8\u524a\u9664\u30d5\u30e9\u30b0\u3092\u3059\u3079\u3066\u306e\u5b50\u306b\u4f1d\u64ad\u3059\u308b\u3002<\/li>\n<li><strong>\u30aa\u30d7\u30b7\u30e7\u30f32\uff1a<\/strong>\u5b50\u3092\u30a2\u30af\u30c6\u30a3\u30d6\u306b\u4fdd\u3064\u304c\u3001\u30af\u30a8\u30ea\u304b\u3089\u975e\u8868\u793a\u306b\u3059\u308b\u3002<\/li>\n<li><strong>\u30aa\u30d7\u30b7\u30e7\u30f33\uff1a<\/strong>\u30ea\u30f3\u30af\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u5225\u3005\u306e\u30ed\u30b8\u30c3\u30af\u3092\u8981\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u30c7\u30b6\u30a4\u30ca\u30fc\u306f\u30b9\u30ad\u30fc\u30de\u4f5c\u6210\u6642\u306b\u3053\u306e\u70b9\u3092\u6c7a\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u4e21\u65b9\u306e\u30c6\u30fc\u30d6\u30eb\u306b<code>deleted_at<\/code>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u5217\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u4fc2\u30ea\u30f3\u30af\u3092\u58ca\u3059\u3053\u3068\u306a\u304f\u4e00\u8cab\u6027\u304c\u4fdd\u305f\u308c\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udcc8 \u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u306e\u8003\u616e\u4e8b\u9805<\/h2>\n<p>\u30c7\u30fc\u30bf\u91cf\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u30011\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210\u3068\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h3>\ud83d\udda5\ufe0f \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565<\/h3>\n<p>\u5e38\u306b\u5916\u90e8\u30ad\u30fc\u5217\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u306a\u3044\u3068\u3001\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u969b\u306b\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u304c\u5fc5\u8981\u306b\u306a\u308a\u3001\u9045\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30af\u30e9\u30b9\u30bf\u5316\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff1a<\/strong>\u4e3b\u30ad\u30fc\u306f\u901a\u5e38\u30af\u30e9\u30b9\u30bf\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><strong>\u975e\u30af\u30e9\u30b9\u30bf\u5316\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff1a<\/strong> \u5916\u90e8\u30ad\u30fc\u306b\u306f\u5c02\u7528\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udda5\ufe0f \u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0<\/h3>\n<p>\u3082\u3057<em>many<\/em>many\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u6570\u5341\u5104\u884c\u306b\u307e\u3067\u6210\u9577\u3057\u305f\u5834\u5408\u3001\u5916\u90e8\u30ad\u30fc\u306b\u57fa\u3065\u3044\u3066\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0\u3059\u308b\u3053\u3068\u3067\u30af\u30a8\u30ea\u901f\u5ea6\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u95a2\u9023\u30c7\u30fc\u30bf\u304c\u30b9\u30c8\u30ec\u30fc\u30b8\u5a92\u4f53\u4e0a\u3067\u7269\u7406\u7684\u306b\u8fd1\u63a5\u3057\u305f\u72b6\u614b\u3092\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udcdd \u4e3b\u306a\u30dd\u30a4\u30f3\u30c8\u306e\u8981\u7d04<\/h2>\n<p>\u30c7\u30fc\u30bf\u30e2\u30c7\u30ea\u30f3\u30b0\u306b\u306f\u6b63\u78ba\u3055\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u8907\u96d1\u3055\u3092\u4f34\u3044\u307e\u3059\u3002\u8b58\u5225\u7684\u95a2\u4fc2\u3068\u975e\u8b58\u5225\u7684\u95a2\u4fc2\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30b3\u30b9\u30c8\u3092\u7ba1\u7406\u3057\u3001\u6b63\u898f\u5316\u306e\u539f\u5247\u306b\u5f93\u3046\u3053\u3068\u3067\u3001\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u306f\u67d4\u8edf\u6027\u3068\u4fe1\u983c\u6027\u3092\u517c\u306d\u5099\u3048\u305f\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li>many\u5074\u306e\u5916\u90e8\u30ad\u30fc\u306f<em>many<\/em>\u975e\u4e00\u610f\u3067\u3042\u308b\u3079\u304d\u3067\u3059\u3002<\/li>\n<li>\u53c2\u7167\u6574\u5408\u6027\u306f\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u307e\u3059\u304c\u3001\u30c7\u30fc\u30bf\u306e\u54c1\u8cea\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n<li>\u8ad6\u7406\u524a\u9664\u306f\u95a2\u4fc2\u30ea\u30f3\u30af\u306e\u53d6\u308a\u6271\u3044\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<li>\u4e00\u8cab\u3057\u305f\u547d\u540d\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u5b9a\u306f\u4fdd\u5b88\u306b\u3068\u3063\u3066\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30cb\u30e5\u30a2\u30f3\u30b9\u3092\u7121\u8996\u3059\u308b\u3068\u3001\u8106\u5f31\u306a\u30b7\u30b9\u30c6\u30e0\u306b\u306a\u308a\u307e\u3059\u3002\u6280\u8853\u7684\u306a\u73fe\u5b9f\u3092\u53d7\u3051\u5165\u308c\u308b\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u6301\u7d9a\u53ef\u80fd\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002\u6b21\u56de\u306e\u30b9\u30ad\u30fc\u30de\u8a2d\u8a08\u306e\u969b\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u524d\u63d0\u3092\u898b\u76f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3092\u78ba\u8a8d\u3057\u3001\u5236\u7d04\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u81ea\u4fe1\u3092\u6301\u3063\u3066\u69cb\u7bc9\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\ud83e\udd14 \u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n<h3>Q: 1\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u53cc\u65b9\u5411\u306b\u3067\u304d\u308b\u304b\uff1f<\/h3>\n<p>A: \u7269\u7406\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u3001\u95a2\u4fc2\u306f\u65b9\u5411\u6027\u3092\u6301\u3061\u307e\u3059\uff08\u89aa\u304b\u3089\u5b50\uff09\u3002\u305f\u3060\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3067\u306f\u3001\u4e21\u65b9\u5411\u306b\u95a2\u4fc2\u3092\u305f\u3069\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306f\u3001\u5b50\u304b\u3089\u89aa\u3078\u306e\u30ea\u30f3\u30af\u3092\u5f37\u5236\u3057\u307e\u3059\u3002<\/p>\n<h3>Q: 1\u5bfe\u591a\u306e\u95a2\u4fc2\u306b\u306f\u4e00\u610f\u5236\u7d04\u304c\u5fc5\u8981\u304b\uff1f<\/h3>\n<p>A: 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\u5faa\u74b0\u4f9d\u5b58\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u304cB\u306b\u95a2\u4fc2\u3057\u3001B\u304cA\u306b\u623b\u308b\u95a2\u4fc2\u304c\u751f\u3058\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u968e\u5c64\u30c7\u30fc\u30bf\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u73fe\u8c61\u3067\u3059\u3002\u81ea\u5df1\u53c2\u7167\u5916\u90e8\u30ad\u30fc\u3092\u4f7f\u7528\u3059\u308b\u304b\u3001\u8a2d\u8a08\u4e0a\u30af\u30a8\u30ea\u3067\u7121\u9650\u30eb\u30fc\u30d7\u304c\u767a\u751f\u3057\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>Q: 1\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u30ec\u30dd\u30fc\u30c8\u4f5c\u6210\u306b\u52b9\u7387\u7684\u304b\uff1f<\/h3>\n<p>A: 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\u5236\u7d04\u306e\u7a2e\u985e\u306b\u3088\u308a\u3001\u524a\u9664\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\uff08Restrict\uff09\u304b\u3001\u5b50\u3092\u81ea\u52d5\u7684\u306b\u524a\u9664\u3059\u308b\uff08Cascade\uff09\u304b\u306e\u3069\u3061\u3089\u304b\u306b\u306a\u308a\u307e\u3059\u3002\u5236\u7d04\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u7834\u58ca\u3059\u308b\u5b64\u7acb\u30ec\u30b3\u30fc\u30c9\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1710,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"1\u5bfe\u591aERD\u95a2\u4fc2\u306e\u8aa4\u89e3\u3092\u89e3\u304f 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