{"id":85,"date":"2026-04-04T06:47:58","date_gmt":"2026-04-04T06:47:58","guid":{"rendered":"https:\/\/www.we-notes.com\/ja\/component-breakdown-decoding-er-diagram-symbols\/"},"modified":"2026-04-04T06:47:58","modified_gmt":"2026-04-04T06:47:58","slug":"component-breakdown-decoding-er-diagram-symbols","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/ja\/component-breakdown-decoding-er-diagram-symbols\/","title":{"rendered":"\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5206\u89e3\uff1a\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306aER\u56f3\u306b\u304a\u3051\u308b\u3059\u3079\u3066\u306e\u8a18\u53f7\u3092\u89e3\u8aad\u3059\u308b"},"content":{"rendered":"<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ER\u56f3\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\u8981\u4ef6\u3092\u3001\u958b\u767a\u8005\u3084\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u304c\u7406\u89e3\u3067\u304d\u308b\u69cb\u9020\u7684\u306a\u8996\u899a\u8a00\u8a9e\u306b\u5909\u63db\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u56f3\u3067\u4f7f\u7528\u3055\u308c\u308b\u7279\u5b9a\u306e\u8a18\u53f7\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3001\u660e\u78ba\u6027\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u8a18\u53f7\u306e\u6a19\u6e96\u5316\u3055\u308c\u305f\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u306a\u3051\u308c\u3070\u3001\u5b9f\u88c5\u6bb5\u968e\u3067\u9ad8\u30b3\u30b9\u30c8\u306e\u8aa4\u308a\u3092\u62db\u304f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306aER\u56f3\u3092\u5b9a\u7fa9\u3059\u308b\u3001\u4e3b\u8981\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3001\u95a2\u4fc2\u6027\u3001\u8a18\u53f7\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<div 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\u95a2\u4fc2\u6027\u306e\u8a18\u53f7<\/h3>\n<ul>\n<li><strong>\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u5f62\u72b6\uff1a<\/strong>\u4f1d\u7d71\u7684\u306a\u30c1\u30a7\u30f3\u8a18\u6cd5\u3067\u306f\u3001\u95a2\u4fc2\u6027\u306f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u3067\u8868\u73fe\u3055\u308c\u307e\u3059\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u540d\u304c\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u306b\u63a5\u7d9a\u3055\u308c\u3001\u305d\u308c\u306b\u3088\u3063\u3066\u305d\u308c\u3089\u3092\u7d50\u3076\u52d5\u8a5e\u3084\u884c\u52d5\u304c\u8a18\u8ff0\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u30e9\u30a4\u30f3\uff1a<\/strong>\u73fe\u4ee3\u306e\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u8a18\u6cd5\u3067\u306f\u3001\u30e9\u30a4\u30f3\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u76f4\u63a5\u7d50\u3073\u3064\u3051\u3066\u3044\u307e\u3059\u3002\u95a2\u4fc2\u540d\u306f\u3001\u901a\u5e38\u30e9\u30a4\u30f3\u306e\u8fd1\u304f\u307e\u305f\u306f\u63a5\u7d9a\u306e\u4e2d\u9593\u306b\u914d\u7f6e\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>\u57fa\u6570\uff1a<\/strong>\u30e9\u30a4\u30f3\u306b\u306f\u3001\u7279\u5b9a\u306e\u30de\u30fc\u30ab\u30fc\u3092\u4ed8\u3051\u3066\u30011\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u3001\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3068\u4f55\u500b\u95a2\u4fc2\u3059\u308b\u304b\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u95a2\u4fc2\u30e2\u30c7\u30ea\u30f3\u30b0\u306b\u304a\u3044\u3066\u6700\u3082\u91cd\u8981\u306a\u5074\u9762\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u95a2\u4fc2\u306e\u65b9\u5411\u6027\u3068\u7a2e\u985e\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u95a2\u4fc2\u306f1\u5bfe1\u30011\u5bfe\u591a\u3001\u591a\u5bfe\u591a\u306e\u3044\u305a\u308c\u304b\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u8aa4\u3063\u3066\u8868\u73fe\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u91cd\u8907\u3084\u5b64\u7acb\u30ec\u30b3\u30fc\u30c9\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u56f3\u66f8\u9928\u304c\u672c\u3068\u4f1a\u54e1\u3092\u7ba1\u7406\u3057\u3066\u3044\u308b\u5834\u5408\u30011\u518a\u306e\u672c\u306f\u591a\u304f\u306e\u4f1a\u54e1\u306b\u8cb8\u3057\u51fa\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u304c\u30011\u4eba\u306e\u4f1a\u54e1\u3082\u591a\u304f\u306e\u672c\u3092\u501f\u308a\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u3067\u3059\u3002<\/p>\n<h2>\ud83d\udccf \u57fa\u6570\u8a18\u6cd5\u306e\u8aac\u660e<\/h2>\n<p>\u57fa\u6570\u306f\u95a2\u4fc2\u306b\u304b\u304b\u308b\u5177\u4f53\u7684\u306a\u5236\u7d04\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u3053\u306e\u554f\u3044\u306b\u7b54\u3048\u308b\u3082\u306e\u3067\u3059\uff1a\u300c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306e1\u3064\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u5bfe\u3057\u3066\u4f55\u500b\u95a2\u4fc2\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304b\uff1f\u300d\u3053\u306e\u610f\u5473\u3092\u8868\u3059\u305f\u3081\u306b\u3001\u4e16\u754c\u4e2d\u3067\u4e3b\u306b3\u3064\u306e\u8a18\u6cd5\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\ud83d\udd39 \u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u8a18\u6cd5<\/h3>\n<p>\u3053\u308c\u306f\u73fe\u4ee3\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u3067\u6700\u3082\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u308b\u6a19\u6e96\u3067\u3059\u3002\u95a2\u4fc2\u30e9\u30a4\u30f3\u306e\u7aef\u306b\u7279\u5b9a\u306e\u8a18\u53f7\u3092\u7528\u3044\u3066\u6570\u91cf\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5358\u7dda\uff1a<\/strong>\u300c1\u3064\u300d\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\uff083\u672c\u306e\u679d\uff09\uff1a<\/strong>\u300c\u8907\u6570\u300d\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5186\uff1a<\/strong>\u300c0\u300d\uff08\u30aa\u30d7\u30b7\u30e7\u30f3\uff09\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5186\uff0b\u7dda\uff1a<\/strong>\u300c0\u307e\u305f\u306f1\u300d\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5186\uff0b\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\uff1a<\/strong>\u300c0\u307e\u305f\u306f\u8907\u6570\u300d\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd39 \u30c1\u30a7\u30f3\u8a18\u6cd5<\/h3>\n<p>\u30c1\u30a7\u30f3\u8a18\u6cd5\u306f\u3001\u95a2\u4fc2\u30e9\u30a4\u30f3\u306e\u5185\u90e8\u306b\u6570\u5b57\u3092\u7528\u3044\u3066\u57fa\u6570\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u5b66\u8853\u7684\u306a\u5834\u9762\u3084\u53e4\u3044\u6587\u66f8\u3067\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>(1,1):<\/strong>\u6b63\u78ba\u306b1\u3064\u3002<\/li>\n<li><strong>(0,1):<\/strong>0\u307e\u305f\u306f1\u3002<\/li>\n<li><strong>(0,N)\uff1a<\/strong>0\u307e\u305f\u306f\u8907\u6570\u3002<\/li>\n<li><strong>(1,N)\uff1a<\/strong>1\u307e\u305f\u306f\u8907\u6570\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd39 UML\u591a\u91cd\u5ea6<\/h3>\n<p>\u7d71\u4e00\u30e2\u30c7\u30ea\u30f3\u30b0\u8a00\u8a9e\uff08UML\uff09\u306f\u3001\u30c1\u30a7\u30f3\u3068\u4f3c\u305f\u69cb\u6587\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304c\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u5de5\u5b66\u306e\u56f3\u3068\u3088\u308a\u6df1\u304f\u7d71\u5408\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<ul>\n<li><strong>1:<\/strong>\u6b63\u78ba\u306b1\u3064\u3002<\/li>\n<li><strong>0..1:<\/strong>0\u500b\u307e\u305f\u306f1\u500b\u3002<\/li>\n<li><strong>0..*:<\/strong>0\u500b\u4ee5\u4e0a\u3002<\/li>\n<li><strong>1..*:<\/strong>1\u500b\u4ee5\u4e0a\u3002<\/li>\n<\/ul>\n<table>\n<thead>\n<tr>\n<th>\u8868\u8a18\u6cd5<\/th>\n<th>\u8a18\u53f7\u306e\u610f\u5473<\/th>\n<th>\u6700\u9069\u306a\u4f7f\u7528\u30b1\u30fc\u30b9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8<\/td>\n<td>\u8996\u899a\u7684\u306a\u30cf\u30c3\u30c1\u3068\u7dda<\/td>\n<td>\u73fe\u4ee3\u306eSQL\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08<\/td>\n<\/tr>\n<tr>\n<td>\u30c1\u30a7\u30f3<\/td>\n<td>\u7bb1\u306e\u4e2d\u306e\u6570\u5b57<\/td>\n<td>\u5b66\u8853\u7684\uff0f\u7406\u8ad6\u7684\u30e2\u30c7\u30eb<\/td>\n<\/tr>\n<tr>\n<td>UML<\/td>\n<td>\u7bc4\u56f2\u69cb\u6587<\/td>\n<td>\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff06\u30b7\u30b9\u30c6\u30e0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9069\u5207\u306a\u8868\u8a18\u6cd5\u3092\u9078\u3076\u3053\u3068\u306f\u3001\u30c1\u30fc\u30e0\u306e\u719f\u6089\u5ea6\u3068\u5229\u7528\u53ef\u80fd\u306a\u30c4\u30fc\u30eb\u306b\u4f9d\u5b58\u3059\u308b\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5236\u7d04\u306b\u95a2\u3057\u3066\u8996\u899a\u7684\u306b\u76f4\u611f\u7684\u3067\u3042\u308b\u70b9\u304b\u3089\u3001\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u306f\u4e00\u822c\u7684\u306b\u597d\u307e\u308c\u308b\u3002<\/p>\n<h2>\u26a0\ufe0f \u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u8b58\u5225\u95a2\u4fc2<\/h2>\n<p>\u3059\u3079\u3066\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u7b49\u3057\u3044\u308f\u3051\u3067\u306f\u306a\u3044\u3002\u3042\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u5b58\u5728\u3059\u308b\u306e\u306f\u3001\u4ed6\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u5b58\u5728\u3059\u308b\u304b\u3089\u3067\u3042\u308b\u3002\u3053\u306e\u3088\u3046\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u547c\u3076\u3002ER\u56f3\u3067\u306f\u3001\u3053\u306e\u4f9d\u5b58\u95a2\u4fc2\u3092\u793a\u3059\u305f\u3081\u306b\u7279\u5225\u306a\u8a18\u53f7\u304c\u5fc5\u8981\u3068\u306a\u308b\u3002<\/p>\n<ul>\n<li><strong>\u4e8c\u91cd\u9577\u65b9\u5f62\uff1a<\/strong>\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u793a\u3059\u3002\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u5b58\u5728\u3057\u306a\u3044\u3068\u3001\u3053\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u4e00\u610f\u306b\u8b58\u5225\u3067\u304d\u306a\u3044\u3002<\/li>\n<li><strong>\u4e8c\u91cd\u83f1\u5f62\uff1a<\/strong>\u8b58\u5225\u95a2\u4fc2\u3092\u793a\u3059\u3002\u3053\u306e\u95a2\u4fc2\u304c\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5b58\u5728\u306b\u5fc5\u9808\u3067\u3042\u308b\u3002<\/li>\n<li><strong>\u7834\u7dda\uff1a<\/strong>\u5f31\u3044\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u6240\u6709\u8005\u3092\u7d50\u3076\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308b\u3002\u4f9d\u5b58\u95a2\u4fc2\u3092\u5f37\u8abf\u3059\u308b\u305f\u3081\u3067\u3042\u308b\u3002<\/li>\n<\/ul>\n<p>\u305f\u3068\u3048\u3070\u3001\u300c\u5f93\u696d\u54e1\u300d\u30b7\u30b9\u30c6\u30e0\u5185\u306e\u300c\u5f93\u5c5e\u8005\u300d\u3068\u3044\u3046\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5f93\u5c5e\u8005\u306f\u3001\u5f93\u696d\u54e1\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u5f93\u5c5e\u8005\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u306b\u306f\u3001\u5f93\u696d\u54e1ID\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u3053\u306e\u69cb\u9020\u7684\u95a2\u4fc2\u306f\u3001\u30b9\u30ad\u30fc\u30de\u751f\u6210\u4e2d\u306b\u30c7\u30fc\u30bf\u640d\u5931\u3092\u9632\u3050\u305f\u3081\u306b\u660e\u78ba\u306b\u30de\u30fc\u30af\u3055\u308c\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\ud83d\udee0\ufe0f 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