{"id":9675,"date":"2025-01-10T16:59:18","date_gmt":"2025-01-10T08:59:18","guid":{"rendered":"https:\/\/www.cybermedian.com\/ja\/understanding-entity-relationship-diagrams-erds-key-concepts-and-types\/"},"modified":"2026-04-14T11:07:43","modified_gmt":"2026-04-14T11:07:43","slug":"understanding-entity-relationship-diagrams-erds-key-concepts-and-types","status":"publish","type":"post","link":"https:\/\/www.cybermedian.com\/ja\/understanding-entity-relationship-diagrams-erds-key-concepts-and-types\/","title":{"rendered":"\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30fb\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u56f3\uff08ERD\uff09\u306e\u7406\u89e3\uff1a\u4e3b\u8981\u306a\u6982\u5ff5\u3068\u7a2e\u985e"},"content":{"rendered":"<h4>\u306f\u3058\u3081\u306b<\/h4>\n<p>\u3042\u308b <a href=\"https:\/\/guides.visual-paradigm.com\/introduction-to-data-modeling-with-visual-paradigm-erd-diagramming-code-generation-and-reverse-engineering\/\">\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u30fb\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u56f3<\/a>\uff08ERD\uff09\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3057\u305f\u3082\u306e\u3067\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u305d\u306e\u5c5e\u6027\u3001\u304a\u3088\u3073\u305d\u308c\u3089\u306e\u9593\u306e\u95a2\u4fc2\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002ERD\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u5206\u6790\u306b\u304a\u3044\u3066\u4e0d\u53ef\u6b20\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u69cb\u9020\u3092\u7406\u89e3\u3057\u3001\u4f1d\u3048\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001ERD\u306e\u4e3b\u8981\u306a\u6982\u5ff5\u30013\u3064\u306e\u7570\u306a\u308bERD\u306e\u7a2e\u985e\u3001\u305d\u308c\u3089\u306e\u9055\u3044\u3001\u305d\u308c\u305e\u308c\u306e\u7a2e\u985e\u3092\u3044\u3064\u4f7f\u7528\u3059\u3079\u304d\u304b\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h4>ERD\u306e\u4e3b\u8981\u306a\u6982\u5ff5<\/h4>\n<ol>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3<\/strong>:\n<ul>\n<li>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u3001\u4ed6\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u533a\u5225\u3067\u304d\u308b\u73fe\u5b9f\u4e16\u754c\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084\u4e8b\u67c4\u3067\u3059\u3002ERD\u3067\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u9577\u65b9\u5f62\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a\u56f3\u306b\u304a\u3044\u3066\u3001\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5c5e\u6027<\/strong>:\n<ul>\n<li>\u5c5e\u6027\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u6027\u8cea\u3084\u7279\u5fb4\u3067\u3059\u3002\u6955\u5186\u3067\u8868\u3055\u308c\u308b\u304b\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u9577\u65b9\u5f62\u5185\u306b\u8a18\u8f09\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a\u300c\u5b66\u6821\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u306f\u300c\u540d\u524d\u300d\u3068\u300c\u8aac\u660e\u300d\u306e\u5c5e\u6027\u304c\u3042\u308a\u3001\u4e00\u65b9\u300c\u751f\u5f92\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u306f\u300c\u540d\u524d\u300d\u3068\u300c\u751f\u5e74\u6708\u65e5\u300d\u306e\u5c5e\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u95a2\u4fc2<\/strong>:\n<ul>\n<li>\u95a2\u4fc2\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u9023\u3092\u8868\u3057\u307e\u3059\u3002\u7dda\u3067\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7d50\u3076\u3053\u3068\u3067\u8868\u73fe\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306e\u95a2\u4fc2\u306f\u3001\u751f\u5f92\u304c\u5b66\u6821\u306b\u95a2\u9023\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u4e3b\u30ad\u30fc<\/strong>:\n<ul>\n<li>\u4e3b\u30ad\u30fc\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u5c5e\u6027\u3067\u3059\u3002\u901a\u5e38\u3001\u4e0b\u7dda\u3092\u5f15\u304f\u304b\u3001\u9375\u306e\u8a18\u53f7\u3067\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a\u8ad6\u7406ERD\u306b\u304a\u3044\u3066\u3001\u300cID\u300d\u306f\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306e\u4e21\u65b9\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3067\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5916\u90e8\u30ad\u30fc<\/strong>:\n<ul>\n<li>\u5916\u90e8\u30ad\u30fc\u306f\u3001\u3042\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u5c5e\u6027\u3067\u3001\u5225\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3057\u3001\u305d\u308c\u3089\u306e\u9593\u306e\u95a2\u4fc2\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a\u8ad6\u7406ERD\u306b\u304a\u3044\u3066\u3001\u300c\u751f\u5f92\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u300cSchoolID\u300d\u306f\u3001\u300c\u5b66\u6821\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u300cID\u300d\u3092\u53c2\u7167\u3059\u308b\u5916\u90e8\u30ad\u30fc\u3067\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h4>ERD\u306e3\u3064\u306e\u7a2e\u985e<\/h4>\n<p><img alt=\"Introduction to Data Modeling with Visual Paradigm: ERD Diagramming, Code  Generation, and Reverse Engineering - Visual Paradigm Guides\" decoding=\"async\" src=\"https:\/\/www.cybermedian.com\/wp-content\/uploads\/2025\/01\/from-conceptual-to-logical-to-physical-erd.png\"\/><\/p>\n<ol>\n<li><strong>\u6982\u5ff5ERD<\/strong>:\n<ul>\n<li><strong>\u5b9a\u7fa9<\/strong>\uff1a\u6982\u5ff5\u7684ERD\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5b9f\u88c5\u306e\u8a73\u7d30\u3092\u8003\u616e\u305b\u305a\u306b\u3001\u4e3b\u8981\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u308c\u3089\u306e\u95a2\u4fc2\u306b\u7126\u70b9\u3092\u5f53\u3066\u305f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u306e\u9ad8\u30ec\u30d9\u30eb\u306a\u6982\u8981\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/li>\n<li><strong>\u76ee\u7684<\/strong>\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u306e\u521d\u671f\u6bb5\u968e\u3067\u3001\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u95a2\u4fc2\u3092\u628a\u63e1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u3002<\/li>\n<li><strong>\u4f8b<\/strong>\uff1a\u56f3\u3067\u306f\u3001\u6982\u5ff5\u7684ERD\u306f\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u305d\u306e\u57fa\u672c\u7684\u306a\u5c5e\u6027\u304a\u3088\u3073\u95a2\u4fc2\u3092\u793a\u3057\u3066\u3044\u308b\u3002<\/li>\n<li><strong>\u4f7f\u7528\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0<\/strong>\uff1a\u521d\u671f\u8a08\u753b\u304a\u3088\u3073\u8981\u4ef6\u53ce\u96c6\u6bb5\u968e\u3067\u6982\u5ff5\u7684ERD\u3092\u4f7f\u7528\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u5e83\u3044\u7406\u89e3\u3092\u5f97\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8ad6\u7406\u7684ERD<\/strong>:\n<ul>\n<li><strong>\u5b9a\u7fa9<\/strong>\uff1a\u8ad6\u7406\u7684ERD\u306f\u3001\u4e3b\u30ad\u30fc\u3068\u5916\u90e8\u30ad\u30fc\u3001\u30c7\u30fc\u30bf\u578b\u3001\u5236\u7d04\u3092\u542b\u3080\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u69cb\u9020\u306e\u3088\u308a\u8a73\u7d30\u306a\u30d3\u30e5\u30fc\u3092\u63d0\u4f9b\u3059\u308b\u3002<\/li>\n<li><strong>\u76ee\u7684<\/strong>\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u8ad6\u7406\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3068\u6b63\u898f\u5316\u3092\u78ba\u4fdd\u3059\u308b\u3002<\/li>\n<li><strong>\u4f8b<\/strong>\uff1a\u56f3\u3067\u306f\u3001\u8ad6\u7406\u7684ERD\u306f\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306e\u4e21\u65b9\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3068\u3057\u3066\u300cID\u300d\u3092\u542b\u307f\u3001\u307e\u305f\u300c\u751f\u5f92\u300d\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u304a\u3051\u308b\u5916\u90e8\u30ad\u30fc\u3068\u3057\u3066\u300cSchoolID\u300d\u3092\u542b\u3093\u3067\u3044\u308b\u3002<\/li>\n<li><strong>\u4f7f\u7528\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0<\/strong>\uff1a\u8a73\u7d30\u8a2d\u8a08\u6bb5\u968e\u3067\u8ad6\u7406\u7684ERD\u3092\u4f7f\u7528\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u3088\u308a\u8a73\u7d30\u306b\u6307\u5b9a\u3057\u3001\u6a5f\u80fd\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7269\u7406\u7684ERD<\/strong>:\n<ul>\n<li><strong>\u5b9a\u7fa9<\/strong>\uff1a\u7269\u7406\u7684ERD\u306f\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\uff08DBMS\uff09\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5b9f\u969b\u306e\u5b9f\u88c5\u3092\u8868\u3057\u3001\u30c6\u30fc\u30d6\u30eb\u3001\u5217\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u5236\u7d04\u3092\u542b\u3080\u3002<\/li>\n<li><strong>\u76ee\u7684<\/strong>\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u7269\u7406\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30b9\u30c8\u30ec\u30fc\u30b8\u3092\u6700\u9069\u5316\u3059\u308b\u3002<\/li>\n<li><strong>\u4f8b<\/strong>\uff1a\u56f3\u3067\u306f\u3001\u7269\u7406\u7684ERD\u306f\u300c\u5b66\u6821\u300d\u3068\u300c\u751f\u5f92\u300d\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u3001\u7279\u5b9a\u306e\u5217\u540d\u3001\u30c7\u30fc\u30bf\u578b\u3001\u95a2\u4fc2\u3068\u3068\u3082\u306b\u793a\u3057\u3066\u3044\u308b\u3002<\/li>\n<li><strong>\u4f7f\u7528\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0<\/strong>\uff1a\u5b9f\u88c5\u6bb5\u968e\u3067\u7269\u7406\u7684ERD\u3092\u4f7f\u7528\u3057\u3001\u9078\u629e\u3057\u305fDBMS\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u3092\u4f5c\u6210\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304a\u3088\u3073\u30b9\u30c8\u30ec\u30fc\u30b8\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h4>3\u7a2e\u985e\u306eERD\u306e\u9055\u3044<\/h4>\n<ol>\n<li><strong>\u8a73\u7d30\u5ea6<\/strong>:\n<ul>\n<li>\u6982\u5ff5ERD\uff1a\u9ad8\u30ec\u30d9\u30eb\u306e\u6982\u8981\u3067\u3001\u4e3b\u8981\u306a\u30a8\u3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href=\"https:\/\/online.visual-paradigm.com\/knowledge\/visual-modeling\/conceptual-vs-logical-vs-physical-data-model\">\u5404\u30bf\u30a4\u30d7\u306eERD<\/a><\/h4>\n<ol>\n<li><strong>\u6982\u5ff5ERD<\/strong>:\n<ul>\n<li>\u521d\u671f\u8a08\u753b\u304a\u3088\u3073\u8981\u4ef6\u53ce\u96c6\u6bb5\u968e\u3067\u4f7f\u7528\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u5e83\u3044\u7406\u89e3\u3092\u5f97\u308b\u3002<\/li>\n<li>\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u3068\u306e\u8b70\u8ad6\u306b\u9069\u3057\u3066\u304a\u308a\u3001\u91cd\u8981\u306a\u30c7\u30fc\u30bf\u8981\u4ef6\u3068\u95a2\u4fc2\u3092\u628a\u63e1\u3059\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u8ad6\u7406ERD<\/strong>:\n<ul>\n<li>\u8a73\u7d30\u8a2d\u8a08\u6bb5\u968e\u3067\u4f7f\u7528\u3057\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u3092\u3088\u308a\u8a73\u7d30\u306b\u6307\u5b9a\u3057\u3001\u6a5f\u80fd\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u8005\u3084\u30a2\u30ca\u30ea\u30b9\u30c8\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u8ad6\u7406\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u306b\u9069\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7269\u7406ERD<\/strong>:\n<ul>\n<li>\u5b9f\u88c5\u6bb5\u968e\u3067\u4f7f\u7528\u3057\u3001\u9078\u629e\u3057\u305fDBMS\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u3092\u4f5c\u6210\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304a\u3088\u3073\u30b9\u30c8\u30ec\u30fc\u30b8\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002<\/li>\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u8005\u3084\u958b\u767a\u8005\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u7269\u7406\u69cb\u9020\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u306b\u9069\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h4>\u7d50\u8ad6<\/h4>\n<p><a href=\"https:\/\/www.visual-paradigm.com\/support\/documents\/vpuserguide\/3563\/3564\/85375_drawingentit.html\">\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3<\/a>\uff08ERD\uff09\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u304a\u3088\u3073\u30b7\u30b9\u30c6\u30e0\u5206\u6790\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u8996\u899a\u7684\u8868\u73fe\u3092\u63d0\u4f9b\u3059\u308b\u30023\u3064\u306e\u30bf\u30a4\u30d7\u306e<a href=\"https:\/\/www.visual-paradigm.com\/support\/documents\/vpuserguide\/3563\/3564\/85378_conceptual,l.html\">ERD<\/a>\u2014\u6982\u5ff5\u7684\u3001\u8ad6\u7406\u7684\u3001\u7269\u7406\u7684\u2014\u306f\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u76ee\u7684\u3092\u6301\u3061\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u958b\u767a\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u306e\u7570\u306a\u308b\u6bb5\u968e\u3067\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u9055\u3044\u3068\u4e3b\u8981\u306a\u6982\u5ff5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u52b9\u679c\u7684\u306a\u8a2d\u8a08\u3001\u5b9f\u88c5\u3001\u7ba1\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<a 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