{"id":1554,"date":"2026-03-26T10:18:03","date_gmt":"2026-03-26T10:18:03","guid":{"rendered":"https:\/\/www.viz-read.com\/ja\/erd-explained-beginner-guide\/"},"modified":"2026-03-26T10:18:03","modified_gmt":"2026-03-26T10:18:03","slug":"erd-explained-beginner-guide","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/ja\/erd-explained-beginner-guide\/","title":{"rendered":"ERD\u306e\u8aac\u660e\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u305f\u3081\u306e\u521d\u5fc3\u8005\u5411\u3051\u660e\u78ba\u306a\u9053\u7b4b"},"content":{"rendered":"<p>\u5805\u7262\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u69cb\u7bc9\u3059\u308b\u3053\u3068\u306f\u3001\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u76e4\u3067\u3059\u3002\u60c5\u5831\u3092\u4fdd\u5b58\u3059\u308b\u30b7\u30b9\u30c6\u30e0\u3092\u69cb\u7bc9\u3057\u59cb\u3081\u308b\u3068\u3001\u8a2d\u8a08\u56f3\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u8a2d\u8a08\u56f3\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u8996\u899a\u7684\u306a\u8868\u73fe\u306b\u3088\u308a\u3001\u958b\u767a\u8005\u3084\u30b9\u30c6\u30fc\u30af\u30db\u30eb\u30c0\u30fc\u306f\u30011\u884c\u306e\u30b3\u30fc\u30c9\u3082\u66f8\u304b\u308c\u308b\u524d\u304b\u3089\u30c7\u30fc\u30bf\u304c\u3069\u306e\u3088\u3046\u306b\u3064\u306a\u304c\u3063\u3066\u3044\u308b\u304b\u3092\u7406\u89e3\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a08\u753b\u6bb5\u968e\u304c\u306a\u3051\u308c\u3070\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3057\u3070\u3057\u3070\u3054\u3061\u3083\u3054\u3061\u3083\u306b\u306a\u308a\u3001\u9045\u304f\u306a\u308a\u3001\u4fdd\u5b88\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002 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class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Chalkboard-style educational infographic explaining Entity Relationship Diagram (ERD) fundamentals for beginners: covers core components (entities, attributes, relationships), cardinality types (1:1, 1:N, M:N), primary\/foreign keys, normalization rules (1NF-3NF), and a 5-step workflow for building database schemas, presented with hand-written teacher-style annotations and simple visual diagrams\" decoding=\"async\" src=\"https:\/\/www.viz-read.com\/wp-content\/uploads\/2026\/03\/erd-database-design-basics-chalkboard-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\u305d\u3082\u305d\u3082ERD\u3068\u306f\u4f55\u304b\uff1f 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\ud83d\udd11<\/h2>\n<p>\u56f3\u3092\u52b9\u679c\u7684\u306b\u69cb\u7bc9\u3059\u308b\u306b\u306f\u3001\u57fa\u672c\u69cb\u6210\u8981\u7d20\u3092\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u56f3\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u6027\u3068\u3044\u30463\u3064\u306e\u4e3b\u8981\u306a\u8981\u7d20\u306b\u4f9d\u5b58\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u3053\u3068\u3067\u3001\u3042\u3089\u3086\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u5fc5\u8981\u306a\u67a0\u7d44\u307f\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<h3>1. \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a\u30c6\u30fc\u30d6\u30eb \ud83d\udce6<\/h3>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3068\u306f\u3001\u30d3\u30b8\u30cd\u30b9\u9818\u57df\u5185\u306e\u7279\u5b9a\u306e\u7269\u4f53\u3001\u4eba\u7269\u3001\u307e\u305f\u306f\u6982\u5ff5\u3092\u8868\u3059\u3082\u306e\u3067\u3059\u3002\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u5fdc\u3057\u307e\u3059\u3002\u5404\u30c6\u30fc\u30d6\u30eb\u306f\u3001\u305d\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u95a2\u3059\u308b\u56fa\u6709\u306e\u60c5\u5831\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u56f3\u66f8\u9928\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u300cBook\uff08\u672c\uff09\u300d\u3068\u300cMember\uff08\u4f1a\u54e1\uff09\u300d\u306f\u7570\u306a\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3059\u3002<\/p>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u56f3\u4e2d\u3067\u901a\u5e38\u3001\u9577\u65b9\u5f62\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u500b\u3005\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u793a\u3059\u305f\u3081\u306b\u3001\u5358\u6570\u540d\u8a5e\u3092\u4f7f\u7528\u3057\u3066\u540d\u524d\u3092\u4ed8\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u306f\u3001\u5b9f\u8cea\u7684\u306b\u30c7\u30fc\u30bf\u306e\u30ab\u30c6\u30b4\u30ea\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5f37\u56fa\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong> 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Number\uff08\u96fb\u8a71\u756a\u53f7\uff09\u3068\u3044\u3063\u305f\u5c5e\u6027\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u5c5e\u6027\u306f\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u306b\u5206\u985e\u3067\u304d\u307e\u3059\uff1a<\/p>\n<ul>\n<li><strong>\u5358\u7d14\u306a\u5c5e\u6027\uff1a<\/strong>\u3055\u3089\u306b\u5206\u5272\u3067\u304d\u306a\u3044\u3082\u306e\u3067\u3001\u5e74\u9f62\u3084\u751f\u5e74\u6708\u65e5\u306a\u3069\u304c\u8a72\u5f53\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u8907\u5408\u5c5e\u6027\uff1a<\/strong> \u30b5\u30d6\u30d1\u30fc\u30c4\u306b\u5206\u5272\u3067\u304d\u308b\u5834\u5408\u304c\u3042\u308a\u3001\u305f\u3068\u3048\u3070\u4f4f\u6240\uff08\u901a\u308a\u3001\u90fd\u5e02\u3001\u90f5\u4fbf\u756a\u53f7\uff09\u306a\u3069\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u8907\u6570\u5024\u5c5e\u6027\uff1a<\/strong>\u8907\u6570\u306e\u5024\u3092\u4fdd\u6301\u3067\u304d\u308b\u3002\u305f\u3068\u3048\u3070\u30b9\u30ad\u30eb\u3084\u96fb\u8a71\u756a\u53f7\u306a\u3069\u3002<\/li>\n<li><strong>\u5c0e\u51fa\u5c5e\u6027\uff1a<\/strong>\u4ed6\u306e\u5c5e\u6027\u304b\u3089\u8a08\u7b97\u3055\u308c\u308b\u3002\u305f\u3068\u3048\u3070\u5e74\u9f62\uff08\u8a95\u751f\u65e5\u304b\u3089\u5c0e\u51fa\uff09\u3002<\/li>\n<\/ul>\n<h3>3. \u95a2\u4fc2\uff1a\u63a5\u7d9a \ud83d\udd04<\/h3>\n<p>\u95a2\u4fc2\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u4e92\u3044\u306b\u3069\u306e\u3088\u3046\u306b\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u304b\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3053\u308c\u306f\u8a2d\u8a08\u306b\u304a\u3044\u3066\u6700\u3082\u91cd\u8981\u306a\u90e8\u5206\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u304c\u3069\u306e\u3088\u3046\u306b\u30ea\u30f3\u30af\u3055\u308c\u308b\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u3002\u56f3\u3067\u306f\u3001\u95a2\u4fc2\u306f\u30c0\u30a4\u30e4\u30e2\u30f3\u30c9\u307e\u305f\u306f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u3064\u306a\u3050\u7dda\u3068\u3057\u3066\u793a\u3055\u308c\u308b\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u300c\u9867\u5ba2\u300d\u304c\u300c\u6ce8\u6587\u300d\u3092\u884c\u3046\u3002\u3053\u308c\u306f\u95a2\u4fc2\u3067\u3042\u308b\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3001\u6ce8\u6587\u304c\u9867\u5ba2\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u524d\u306b\u9867\u5ba2\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3059\u308b\u30eb\u30fc\u30eb\u3092\u5f37\u5236\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5b64\u7acb\u3057\u305f\u30c7\u30fc\u30bf\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<h2>\u57fa\u6570\u3068\u30e2\u30c0\u30ea\u30c6\u30a3\u306e\u7406\u89e3 \ud83d\udccf<\/h2>\n<p>\u57fa\u6570\u306f\u3001\u95a2\u9023\u3059\u308b2\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30ec\u30b3\u30fc\u30c9\u9593\u306e\u6570\u7684\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3053\u306e\u554f\u3044\u306b\u7b54\u3048\u308b\uff1a\u300c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306e\u4f55\u500b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306e\u4f55\u500b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u95a2\u9023\u3057\u3066\u3044\u308b\u304b\uff1f\u300d\u3002\u3053\u308c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u306e\u7570\u5e38\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<p>\u57fa\u6570\u306b\u306f\u4e3b\u306b3\u3064\u306e\u30bf\u30a4\u30d7\u304c\u3042\u308b\uff1a<\/p>\n<ol>\n<li><strong>1\u5bfe1\uff081:1\uff09\uff1a<\/strong>\u30c6\u30fc\u30d6\u30ebA\u306e1\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30c6\u30fc\u30d6\u30ebB\u306e\u6b63\u78ba\u306b1\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u9023\u3059\u308b\u3002<\/li>\n<li><strong>1\u5bfe\u591a\uff081:N\uff09\uff1a<\/strong>\u30c6\u30fc\u30d6\u30ebA\u306e1\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30c6\u30fc\u30d6\u30ebB\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u9023\u3059\u308b\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\uff08M:N\uff09\uff1a<\/strong>\u30c6\u30fc\u30d6\u30ebA\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u3001\u30c6\u30fc\u30d6\u30ebB\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u9023\u3059\u308b\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u3001\u5b9f\u969b\u306e\u4f8b\u3092\u7528\u3044\u3066\u3053\u308c\u3089\u306e\u95a2\u4fc2\u3092\u8aac\u660e\u3057\u305f\u8868\u3067\u3042\u308b\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u57fa\u6570\u306e\u7a2e\u985e<\/th>\n<th>\u4f8b\u306e\u30b7\u30ca\u30ea\u30aa<\/th>\n<th>\u5b9f\u88c5\u65b9\u6cd5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1\u5bfe1\uff081:1\uff09<\/td>\n<td>\u5f93\u696d\u54e1\u3068\u30d1\u30b9\u30dd\u30fc\u30c8<\/td>\n<td>1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5916\u90e8\u30ad\u30fc\u3092\u8a2d\u7f6e<\/td>\n<\/tr>\n<tr>\n<td>1\u5bfe\u591a\uff081:N\uff09<\/td>\n<td>\u90e8\u7f72\u3068\u5f93\u696d\u54e1<\/td>\n<td>\u300c\u591a\u300d\u5074\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u5916\u90e8\u30ad\u30fc\u3092\u8a2d\u7f6e<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u5bfe\u591a\uff08M:N\uff09<\/td>\n<td>\u5b66\u751f\u3068\u6388\u696d<\/td>\n<td>\u4e2d\u9593\u7d50\u5408\u30c6\u30fc\u30d6\u30eb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u30e2\u30c0\u30ea\u30c6\u30a3\u306f\u3001\u3055\u3089\u306b\u8a73\u7d30\u306a\u5c64\u3092\u52a0\u3048\u307e\u3059\u3002\u95a2\u4fc2\u304c\u5fc5\u9808\u304b\u30aa\u30d7\u30b7\u30e7\u30f3\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u6ce8\u6587\u306f\u9867\u5ba2\u306a\u3057\u3067\u5b58\u5728\u3067\u304d\u307e\u3059\u304b\uff1f\u901a\u5e38\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u5fc5\u9808\u306e\u95a2\u4fc2\u3067\u3059\u3002\u9867\u5ba2\u304c\u6ce8\u6587\u3092\u6301\u305f\u306a\u3044\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f\u306f\u3044\u3001\u3053\u308c\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n<h2>\u30ad\u30fc\uff1a\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u63a5\u7740\u5264 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