{"id":1648,"date":"2026-04-08T07:46:40","date_gmt":"2026-04-08T07:46:40","guid":{"rendered":"https:\/\/www.viz-note.com\/ja\/erd-elements-confusion-breakdown\/"},"modified":"2026-04-08T07:46:40","modified_gmt":"2026-04-08T07:46:40","slug":"erd-elements-confusion-breakdown","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/ja\/erd-elements-confusion-breakdown\/","title":{"rendered":"\u6df7\u4e71\u3092\u5f15\u304d\u8d77\u3053\u3057\u3084\u3059\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\u306e\u8981\u7d20\u306e\u69cb\u6210\u8981\u7d20\u306e\u5206\u89e3"},"content":{"rendered":"<p>\u5805\u7262\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u3092\u8a2d\u8a08\u3059\u308b\u306b\u306f\u6b63\u78ba\u3055\u304c\u6c42\u3081\u3089\u308c\u308b\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u306f\u3001\u3053\u306e\u69cb\u9020\u306e\u8a2d\u8a08\u56f3\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3001\u8907\u96d1\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u958b\u767a\u8005\u3084\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u304c\u7406\u89e3\u3067\u304d\u308b\u8996\u899a\u7684\u306a\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u6709\u7528\u6027\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001ERD\u306f\u30e2\u30c7\u30ea\u30f3\u30b0\u6bb5\u968e\u3067\u3057\u3070\u3057\u3070\u8aa4\u89e3\u306e\u539f\u56e0\u3068\u306a\u308b\u3002\u8a18\u53f7\u306e\u66d6\u6627\u3055\u3001\u57fa\u6570\u306e\u8aa4\u89e3\u3001\u5c5e\u6027\u306e\u7a2e\u985e\u306b\u95a2\u3059\u308b\u6df7\u4e71\u306f\u3001\u958b\u767a\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306e\u5f8c\u534a\u306b\u5927\u304d\u306a\u518d\u4f5c\u696d\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/p>\n<p>\u3053\u306e\u30ac\u30a4\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9593\u3067\u3088\u304f\u6469\u64e6\u3092\u751f\u3058\u308bERD\u5185\u306e\u7279\u5b9a\u306e\u69cb\u6210\u8981\u7d20\u306b\u3064\u3044\u3066\u8a73\u7d30\u306b\u691c\u8a0e\u3059\u308b\u3002\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u9055\u3044\u3092\u660e\u78ba\u306b\u3057\u3001\u95a2\u4fc2\u306e\u8868\u8a18\u6cd5\u3092\u5206\u89e3\u3057\u3001\u5c5e\u6027\u306e\u5206\u985e\u3092\u5206\u6790\u3059\u308b\u3053\u3068\u3067\u3001\u8aa4\u308a\u3092\u6e1b\u3089\u3057\u3001\u7d50\u679c\u3068\u3057\u3066\u5f97\u3089\u308c\u308b\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u304c\u904b\u7528\u8981\u4ef6\u3092\u6b63\u78ba\u306b\u53cd\u6620\u3059\u308b\u3053\u3068\u3092\u78ba\u4fdd\u3067\u304d\u308b\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Cartoon infographic explaining Entity Relationship Diagram components that commonly cause confusion: strong vs weak entities with rectangle notation, cardinality symbols (1, 0..1, 1..N, 0..N) with crow's foot notation, primary\/foreign\/composite key identification, recursive self-referencing relationships, common modeling pitfalls like over-normalization and missing junction tables, and validation best practices for database schema design\" decoding=\"async\" src=\"https:\/\/www.viz-note.com\/wp-content\/uploads\/2026\/04\/erd-components-confusion-infographic-cartoon.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83c\udfd7\ufe0f 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\u3053\u308c\u3089\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u3001\u81ea\u3089\u306e\u5c5e\u6027\u3060\u3051\u3067\u306f\u4e00\u610f\u306b\u8b58\u5225\u3067\u304d\u306a\u3044\u3002\u8b58\u5225\u89aa\u3068\u547c\u3070\u308c\u308b\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u306e\u95a2\u4fc2\u306b\u4f9d\u5b58\u3057\u3066\u5b58\u5728\u3059\u308b\u3002\u305f\u3068\u3048\u3070\u3001\u6ce8\u6587\u30b7\u30b9\u30c6\u30e0\u5185\u306e<code>\u660e\u7d30\u884c<\/code>\u306f\u3001\u7279\u5b9a\u306e<code>\u6ce8\u6587<\/code>.<\/li>\n<\/ul>\n<p>\u6df7\u4e71\u306e\u539f\u56e0\u306f\u3001\u3053\u308c\u3089\u306e\u8868\u73fe\u304c\u8996\u899a\u7684\u306b\u3069\u306e\u3088\u3046\u306b\u63cf\u304b\u308c\u308b\u304b\u306b\u3042\u308b\u3002\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u901a\u5e38\u3001\u6a19\u6e96\u306e\u9577\u65b9\u5f62\u3067\u63cf\u304b\u308c\u308b\u3002\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u3057\u3070\u3057\u3070\u4e8c\u91cd\u306e\u9577\u65b9\u5f62\u3067\u8868\u73fe\u3055\u308c\u308b\u3002\u3053\u308c\u3089\u3092\u8996\u899a\u7684\u306b\u533a\u5225\u3057\u306a\u3044\u3068\u3001\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u3001\u305d\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u5f37\u5236\u3059\u308b\u305f\u3081\u306e\u5fc5\u8981\u306a\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u306a\u3057\u306b\u4f5c\u6210\u3055\u308c\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5b9f\u88c5\u306e\u8aa4\u308a\u306b\u3064\u306a\u304c\u308b\u3002<\/p>\n<h3>\u8aa4\u5206\u985e\u306e\u5f71\u97ff<\/h3>\n<p>\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u3066\u30e2\u30c7\u30eb\u5316\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u89aa\u3092\u6301\u305f\u306a\u3044\u30ec\u30b3\u30fc\u30c9\u306e\u5b58\u5728\u3092\u8a31\u53ef\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b64\u7acb\u30c7\u30fc\u30bf\u304c\u767a\u751f\u3059\u308b\u3002\u9006\u306b\u3001\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u3066\u30e2\u30c7\u30eb\u5316\u3059\u308b\u3068\u3001\u4e0d\u8981\u306a\u4f9d\u5b58\u95a2\u4fc2\u304c\u5f37\u5236\u3055\u308c\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u306a\u6587\u8108\u5916\u3067\u306e\u5229\u7528\u53ef\u80fd\u6027\u304c\u5236\u9650\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u72ec\u7acb\u3057\u3066\u5b58\u5728\u3067\u304d\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u305f\u4e0a\u3067\u3001\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u3057\u3066\u306e\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u3002<\/p>\n<ul>\n<li><strong>\u72ec\u7acb\u6027\u306e\u78ba\u8a8d\uff1a<\/strong>\u3053\u306e\u30ec\u30b3\u30fc\u30c9\u306f\u4ed6\u306e\u30ec\u30b3\u30fc\u30c9\u3078\u306e\u30ea\u30f3\u30af\u306a\u3057\u3067\u5b58\u5728\u3067\u304d\u308b\u304b\uff1f<\/li>\n<li><strong>\u8b58\u5225\u5b50\u306e\u6e90\u6cc9\uff1a<\/strong>\u4e00\u610f\u306eID\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u81ea\u4f53\u304b\u3089\u6765\u308b\u306e\u304b\u3001\u305d\u308c\u3068\u3082\u95a2\u4fc2\u304b\u3089\u6765\u308b\u306e\u304b\uff1f<\/li>\n<li><strong>\u5b58\u5728\u4f9d\u5b58\u6027\uff1a<\/strong>\u89aa\u3092\u524a\u9664\u3059\u308b\u3068\u3001\u5b50\u3082\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u308b\u304b\uff1f<\/li>\n<\/ul>\n<h2>\ud83d\udd17 \u95a2\u4fc2\u306e\u57fa\u6570\u3068\u30aa\u30d7\u30b7\u30e7\u30ca\u30ea\u30c6\u30a3<\/h2>\n<p>\u95a2\u4fc2\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3069\u3046\u3057\u304c\u3069\u306e\u3088\u3046\u306b\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u304b\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u57fa\u6570\u306f\u3001\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\u5fc5\u9808\u306e\u6570\uff09\u3092\u6307\u5b9a\u3059\u308b\u3002\u3053\u306e\u70b9\u306f\u3001\u8a18\u6cd5\u306e\u30b9\u30bf\u30a4\u30eb\u306e\u9055\u3044\u306b\u3088\u308a\u3001\u6700\u3082\u6df7\u4e71\u3057\u3084\u3059\u3044\u9818\u57df\u3067\u3042\u308b\u3002<\/p>\n<h3>\u57fa\u6570\u306e\u8868\u8a18\u6cd5<\/h3>\n<p>\u56f3\u4e0a\u3067\u57fa\u6570\u3092\u8868\u3059\u65b9\u6cd5\u306f\u8907\u6570\u5b58\u5728\u3059\u308b\u3002\u4e00\u90e8\u306f\u300c1\u300d\u3084\u300cN\u300d\u306a\u3069\u306e\u30c6\u30ad\u30b9\u30c8\u30e9\u30d9\u30eb\u3092\u4f7f\u7528\u3059\u308b\u304c\u3001\u4ed6\u306f\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u8a18\u6cd5\u3092\u7528\u3044\u308b\u3002\u3053\u308c\u3089\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u6df7\u5728\u3055\u305b\u305f\u308a\u3001\u8a18\u53f7\u3092\u8aa4\u89e3\u3057\u305f\u308a\u3059\u308b\u3068\u3001\u7269\u7406\u30b9\u30ad\u30fc\u30de\u306b\u8ad6\u7406\u7684\u306a\u7a74\u304c\u751f\u3058\u308b\u3002<\/p>\n<table border=\"1\" style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th>\u8a18\u53f7\uff0f\u30e9\u30d9\u30eb<\/th>\n<th>\u610f\u5473<\/th>\n<th>\u4f8b\u306e\u30b7\u30ca\u30ea\u30aa<\/th>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>\u3061\u3087\u3046\u3069\u4e00\u3064<\/td>\n<td>\u500b\u4eba\u306f\u3061\u3087\u3046\u3069\u4e00\u3064\u306e\u793e\u4f1a\u4fdd\u969c\u756a\u53f7\u3092\u6301\u3064\u3002<\/td>\n<\/tr>\n<tr>\n<td>0..1<\/td>\n<td>\u30bc\u30ed\u307e\u305f\u306f\u4e00\u3064<\/td>\n<td>\u500b\u4eba\u306f\u4e2d\u9593\u540d\u3092\u6301\u305f\u306a\u3044\u304b\u3001\u4e00\u3064\u3060\u3051\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>1..1<\/td>\n<td>\u4e00\u3064\u3067\u3042\u308a\u3001\u552f\u4e00\u306e\u3082\u306e<\/td>\n<td>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u306f\u3001\u5fc5\u305a\u4e00\u3064\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>0..N<\/td>\n<td>\u30bc\u30ed\u304b\u3089\u591a\u6570<\/td>\n<td>\u6ce8\u6587\u306b\u306f\u30bc\u30ed\u500b\u307e\u305f\u306f\u591a\u6570\u306e\u884c\u9805\u76ee\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/td>\n<\/tr>\n<tr>\n<td>1..N<\/td>\n<td>\u4e00\u3064\u304b\u3089\u591a\u6570<\/td>\n<td>\u90e8\u9580\u306b\u306f\u3001\u4e00\u3064\u307e\u305f\u306f\u591a\u6570\u306e\u5f93\u696d\u54e1\u304c\u3044\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/td>\n<\/tr>\n<\/table>\n<h3>\u9078\u629e\u7684\u304a\u3088\u3073null\u8a31\u5bb9\u6027<\/h3>\n<p>\u9078\u629e\u7684\u3068\u306f\u3001\u95a2\u4fc2\u304c\u5fc5\u9808\u304b\u4efb\u610f\u304b\u3092\u6307\u3059\u3002\u3053\u308c\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5916\u90e8\u30ad\u30fc\u5b9a\u7fa9\u306b\u76f4\u63a5\u5f71\u97ff\u3059\u308b\u3002\u95a2\u4fc2\u304c\u5fc5\u9808\u306e\u5834\u5408\u3001\u5916\u90e8\u30ad\u30fc\u5217\u306fnull\u306b\u3067\u304d\u306a\u3044\u3002\u4efb\u610f\u306e\u5834\u5408\u3001null\u306b\u3067\u304d\u308b\u3002<\/p>\n<p>\u56f3\u9762\u3067\u5b9f\u7dda\u3068\u7834\u7dda\u3092\u793a\u3059\u5834\u5408\u3001\u6df7\u4e71\u304c\u751f\u3058\u308b\u3053\u3068\u304c\u591a\u3044\u3002\u660e\u78ba\u306a\u51e1\u4f8b\u304c\u306a\u3044\u3068\u3001\u958b\u767a\u8005\u306f\u5b58\u5728\u3057\u306a\u3044\u5fc5\u9808\u95a2\u4fc2\u3092\u4eee\u5b9a\u3057\u3001\u30c7\u30fc\u30bf\u5165\u529b\u6642\u306b\u5236\u7d04\u9055\u53cd\u3092\u5f15\u304d\u8d77\u3053\u3059\u3002\u30e2\u30c7\u30eb\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5185\u306b\u7dda\u306e\u30b9\u30bf\u30a4\u30eb\u306e\u610f\u5473\u3092\u660e\u793a\u7684\u306b\u8a18\u9332\u3059\u308b\u3053\u3068\u304c\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u3002<\/p>\n<ul>\n<li><strong>\u5fc5\u9808\u95a2\u4fc2\uff1a<\/strong> \u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u6709\u52b9\u3067\u3042\u308b\u305f\u3081\u306b\u306f\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<li><strong>\u4efb\u610f\u95a2\u4fc2\uff1a<\/strong> \u5b50\u30ec\u30b3\u30fc\u30c9\u306f\u89aa\u306a\u3057\u3067\u4f5c\u6210\u53ef\u80fd\u3067\u3042\u308a\u3001\u89aa\u306f\u5b50\u306a\u3057\u3067\u5b58\u5728\u3057\u3066\u3082\u3088\u3044\u3002<\/li>\n<li><strong>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\uff1a<\/strong> \u5fc5\u305a <code>NOT NULL<\/code> \u5fc5\u9808\u306e\u5834\u5408\u306b\u3001<code>NULL<\/code> \u4efb\u610f\u306e\u5834\u5408\u306b\u8a31\u5bb9\u3055\u308c\u308b\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udd11 \u5c5e\u6027\u3068\u30ad\u30fc\u306e\u8b58\u5225<\/h2>\n<p>\u5c5e\u6027\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u898b\u305f\u76ee\u306f\u5358\u7d14\u306b\u601d\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u5c5e\u6027\u3092\u30ad\u30fc\u3001\u5916\u90e8\u30ad\u30fc\u3001\u304a\u3088\u3073\u5358\u7d14\u306a\u5c5e\u6027\u306b\u5206\u985e\u3059\u308b\u969b\u306b\u3001\u6b63\u898f\u5316\u3084\u30af\u30a8\u30ea\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u304a\u3044\u3066\u983b\u7e41\u306b\u8aa4\u308a\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n<h3>\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u5bfe\u5916\u90e8\u30ad\u30fc<\/h3>\n<p>\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\uff08PK\uff09\u306f\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3057\u307e\u3059\u3002\u5916\u90e8\u30ad\u30fc\uff08FK\uff09\u306f\u884c\u3092\u89aa\u30c6\u30fc\u30d6\u30eb\u306b\u30ea\u30f3\u30af\u3057\u307e\u3059\u3002\u81ea\u7136\u30ad\u30fc\u304c\u30b5\u30ed\u30b2\u30fc\u30c8\u30ad\u30fc\u306e\u4ee3\u308f\u308a\u306b\u4f7f\u308f\u308c\u308b\u5834\u5408\u3001\u307e\u305f\u306fPK\u304c\u56f3\u306e\u5168\u4f53\u3067\u4e00\u8cab\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u6df7\u4e71\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u81ea\u7136\u30ad\u30fc\uff1a<\/strong>\u30c7\u30fc\u30bf\u306b\u81ea\u7136\u306b\u5b58\u5728\u3059\u308b\u30ad\u30fc\u3067\u3001\u793e\u4f1a\u4fdd\u969c\u756a\u53f7\u3084\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306a\u3069\u304c\u8a72\u5f53\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u5909\u66f4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u6574\u5408\u6027\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30b5\u30ed\u30b2\u30fc\u30c8\u30ad\u30fc\uff1a<\/strong>\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u308b\u4eba\u5de5\u7684\u306a\u30ad\u30fc\u3067\u3001\u81ea\u52d5\u5897\u5206\u306e\u6574\u6570\u306a\u3069\u304c\u8a72\u5f53\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u5b89\u5b9a\u6027\u306e\u89b3\u70b9\u304b\u3089\u4e00\u822c\u7684\u306b\u597d\u307e\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u8907\u5408\u30ad\u30fc<\/h3>\n<p>\u8907\u5408\u30ad\u30fc\u306f\u3001\u7d44\u307f\u5408\u308f\u305b\u30661\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b2\u3064\u4ee5\u4e0a\u306e\u5217\u304b\u3089\u69cb\u6210\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u591a\u5bfe\u591a\u95a2\u4fc2\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3067\u3088\u304f\u898b\u3089\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306e\u6df7\u4e71\u306f\u3001\u5217\u306e\u9806\u5e8f\u3068\u3001\u3069\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u30ad\u30fc\u3092\u4fdd\u6301\u3057\u3066\u3044\u308b\u304b\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u8907\u5408\u30ad\u30fc\u5185\u306e\u5217\u306e\u9806\u5e8f\u304c\u95a2\u9023\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u9593\u3067\u4e00\u8cab\u3057\u3066\u7dad\u6301\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u7d50\u5408\u304c\u5931\u6557\u3059\u308b\u304b\u3001\u8907\u96d1\u306a\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u5b9a\u7fa9\u306b\u304a\u3051\u308b\u6b63\u78ba\u306a\u5217\u306e\u9806\u5e8f\u3092\u6587\u66f8\u5316\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h2>\ud83d\udd01 \u518d\u5e30\u7684\u95a2\u4fc2<\/h2>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u81ea\u5206\u81ea\u8eab\u3068\u95a2\u4fc2\u3092\u6301\u3064\u5834\u5408\u3001\u518d\u5e30\u7684\u95a2\u4fc2\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u7d44\u7e54\u56f3\u3084\u90e8\u54c1\u8868\u306e\u3088\u3046\u306a\u968e\u5c64\u69cb\u9020\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u6df7\u4e71\u306e\u539f\u56e0\u306f\u8996\u899a\u7684\u306a\u8868\u73fe\u306b\u3042\u308a\u3001\u7dda\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u81ea\u8eab\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u660e\u78ba\u306a\u30e9\u30d9\u30eb\u304c\u306a\u3044\u3068\u3001\u95a2\u4fc2\u306e\u3069\u3061\u3089\u5074\u304c\u89aa\u3067\u3069\u3061\u3089\u304c\u5b50\u304b\u304c\u308f\u304b\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\u3067\u306f\u30011\u4eba\u306e\u5f93\u696d\u54e1\u304c\u4ed6\u306e\u5f93\u696d\u54e1\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002\u95a2\u4fc2\u306f\u3001\u5f93\u696d\u54e1\u304c\u4ed6\u306e\u5f93\u696d\u54e1\u306e\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u306b\u306a\u308a\u5f97\u308b\u3053\u3068\u3092\u660e\u78ba\u306b\u793a\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u81ea\u5df1\u53c2\u7167\uff1a<\/strong> \u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5916\u90e8\u30ad\u30fc\u304c\u3001\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u306e\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u3092\u6307\u3057\u793a\u3059\u3002<\/li>\n<li><strong>NULL\u306e\u6271\u3044\uff1a<\/strong> \u968e\u5c64\u306e\u6839\u306b\u306f\u3001\u901a\u5e38\u3001\u30de\u30cd\u30fc\u30b8\u30e3\u30fcID\u5217\u306bNULL\u5024\u304c\u5165\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u6df1\u3055\u306e\u5236\u9650\uff1a<\/strong> \u968e\u5c64\u304c\u975e\u5e38\u306b\u6df1\u3044\u5834\u5408\u3001\u518d\u5e30\u30af\u30a8\u30ea\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u26a0\ufe0f \u4e00\u822c\u7684\u306a\u30e2\u30c7\u30eb\u5316\u306e\u843d\u3068\u3057\u7a74<\/h2>\n<p>\u7279\u5b9a\u306e\u8981\u7d20\u3092\u8d85\u3048\u3066\u3001\u3042\u308b\u7a2e\u306e\u69cb\u9020\u7684\u30d1\u30bf\u30fc\u30f3\u304c\u5b9f\u88c5\u4e2d\u306b\u6df7\u4e71\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u843d\u3068\u3057\u7a74\u3092\u65e9\u671f\u306b\u8a8d\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u9ad8\u30b3\u30b9\u30c8\u306a\u30b9\u30ad\u30fc\u30de\u79fb\u884c\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>1. 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<code>customerId<\/code>\uff09\u306f\u3001\u30af\u30a8\u30ea\u3092\u66f8\u304f\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u6df7\u4e71\u3092\u62db\u304d\u307e\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u521d\u671f\u6bb5\u968e\u3067\u6a19\u6e96\u5316\u3055\u308c\u305f\u547d\u540d\u898f\u5247\u3092\u5b9a\u3081\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5c0f\u6587\u5b57\uff0b\u30a2\u30f3\u30c0\u30fc\u30b9\u30b3\u30a2\uff1a<\/strong> <code>order_line_items<\/code><\/li>\n<li><strong>PascalCase\uff1a<\/strong> <code>OrderLineItems<\/code><\/li>\n<li><strong>CamelCase\uff1a<\/strong> <code>orderLineItems<\/code><\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f \u691c\u8a3c\u6226\u7565<\/h2>\n<p>ERD\u304c\u6b63\u78ba\u304b\u3064\u4f7f\u3044\u3084\u3059\u3044\u72b6\u614b\u3092\u4fdd\u3064\u305f\u3081\u3001\u30ec\u30d3\u30e5\u30fc\u904e\u7a0b\u3067\u7279\u5b9a\u306e\u691c\u8a3c\u30b9\u30c6\u30c3\u30d7\u3092\u5b9f\u65bd\u3059\u3079\u304d\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30b9\u30c6\u30c3\u30d7\u306b\u3088\u308a\u3001\u30b9\u30ad\u30fc\u30de\u304c\u56fa\u5b9a\u3055\u308c\u308b\u524d\u306b\u6df7\u4e71\u306e\u539f\u56e0\u3092\u767a\u898b\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u3068\u306e\u30a6\u30a9\u30fc\u30af\u30b9\u30eb\u30fc\uff1a<\/strong>\u30d3\u30b8\u30cd\u30b9\u30e6\u30fc\u30b6\u30fc\u3068\u56f3\u9762\u3092\u78ba\u8a8d\u3057\u3001\u95a2\u4fc2\u6027\u304c\u5f7c\u3089\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u306b\u5bfe\u3059\u308b\u30e1\u30f3\u30bf\u30eb\u30e2\u30c7\u30eb\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li><strong>\u5236\u7d04\u306e\u691c\u8a3c\uff1a<\/strong>\u3059\u3079\u3066\u306e\u5916\u90e8\u30ad\u30fc\u304c\u5bfe\u5fdc\u3059\u308b\u4e3b\u30ad\u30fc\u53c2\u7167\u3092\u6301\u3063\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u578b\u306e\u4e00\u8cab\u6027\uff1a<\/strong>1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u6574\u6570\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u5c5e\u6027\u304c\u3001\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u6587\u5b57\u5217\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li><strong>\u51e1\u4f8b\u306e\u6e96\u62e0\uff1a<\/strong>\u56f3\u9762\u3067\u4f7f\u7528\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u8a18\u53f7\u304c\u3001\u63d0\u4f9b\u3055\u308c\u305f\u51e1\u4f8b\u307e\u305f\u306f\u6a19\u6e96\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcdd 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name=\"description\" content=\"\u6df7\u4e71\u3057\u3084\u3059\u3044ERD\u8981\u7d20\u306e\u8a73\u7d30\u306a\u5206\u89e3\u3002\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3001\u30ad\u30fc\u3001\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u3064\u3044\u3066\u5b66\u3073\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30e2\u30c7\u30ea\u30f3\u30b0\u306e\u6b63\u78ba\u6027\u3092\u5411\u4e0a\u3055\u305b\u307e\u3057\u3087\u3046\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.viz-note.com\/ja\/erd-elements-confusion-breakdown\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ERD\u8981\u7d20\u306e\u6df7\u4e71\uff1a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u95a2\u4fc2\u3001\u5c5e\u6027\u30ac\u30a4\u30c9 \ud83e\udde9\" \/>\n<meta property=\"og:description\" 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