{"id":1703,"date":"2026-03-23T22:23:22","date_gmt":"2026-03-23T22:23:22","guid":{"rendered":"https:\/\/www.viz-read.com\/ja\/how-to-read-an-erd-like-a-pro\/"},"modified":"2026-03-23T22:23:22","modified_gmt":"2026-03-23T22:23:22","slug":"how-to-read-an-erd-like-a-pro","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/ja\/how-to-read-an-erd-like-a-pro\/","title":{"rendered":"\u30d7\u30ed\u306e\u3088\u3046\u306bERD\u3092\u8aad\u3080\u65b9\u6cd5\uff1a\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u958b\u767a\u8005\u304c\u5fc5\u305a\u8eab\u306b\u3064\u3051\u305f\u3044\u30b9\u30ad\u30eb"},"content":{"rendered":"<p>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u306e\u8907\u96d1\u306a\u4e16\u754c\u306b\u304a\u3044\u3066\u3001\u30c7\u30fc\u30bf\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u69cb\u7bc9\u3059\u308b\u57fa\u76e4\u3068\u306a\u308b\u3002\u305d\u306e\u30c7\u30fc\u30bf\u3092\u64cd\u4f5c\u3059\u308b\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u4e2d\u5fc3\u7684\u306a\u8cac\u4efb\u3067\u3042\u308b\u4e00\u65b9\u3067\u3001\u30c7\u30fc\u30bf\u305d\u306e\u3082\u306e\u306e\u69cb\u9020\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3082\u540c\u69d8\u306b\u91cd\u8981\u3067\u3042\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\u3059\u308b\u3002\u60c5\u5831\u304c\u3069\u306e\u3088\u3046\u306b\u683c\u7d0d\u3055\u308c\u3001\u30ea\u30f3\u30af\u3055\u308c\u3001\u53d6\u5f97\u3055\u308c\u308b\u304b\u3092\u4f1d\u3048\u308b\u8996\u899a\u7684\u306a\u8a00\u8a9e\u3067\u3042\u308b\u3002\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u3001ERD\u3092\u6d41\u66a2\u306b\u8aad\u307f\u89e3\u304f\u80fd\u529b\u306f\u3001\u5358\u306a\u308b\u671b\u307e\u3057\u3044\u30b9\u30ad\u30eb\u3067\u306f\u306a\u304f\u3001\u5805\u7262\u3067\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u304b\u3064\u4fdd\u5b88\u53ef\u80fd\u306a\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u8981\u4ef6\u3067\u3042\u308b\u3002<\/p>\n<p>\u591a\u304f\u306e\u958b\u767a\u8005\u306f\u3001\u30b9\u30ad\u30fc\u30de\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3092\u5341\u5206\u306b\u7406\u89e3\u305b\u305a\u306b\u3001\u3044\u304d\u306a\u308a\u30af\u30a8\u30ea\u306e\u8a18\u8ff0\u306b\u53d6\u308a\u639b\u304b\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3084\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u554f\u984c\u304c\u767a\u751f\u3057\u3001\u5f8c\u3005\u306b\u96e3\u3057\u3044\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f5c\u696d\u3092\u5f37\u3044\u3089\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002ERD\u3092\u6b63\u3057\u304f\u89e3\u91c8\u3059\u308b\u6280\u8853\u3092\u7fd2\u5f97\u3059\u308b\u3053\u3068\u3067\u3001\u30c7\u30fc\u30bf\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u6d41\u308c\u3001\u3042\u308b\u9818\u57df\u306e\u5909\u66f4\u304c\u5168\u4f53\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u53ca\u307c\u3059\u304b\u3092\u4e88\u898b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3002\u3053\u306e\u30ac\u30a4\u30c9\u3067\u306f\u3001ERD\u306e\u8aad\u307f\u65b9\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u306b\u7126\u70b9\u3092\u5f53\u3066\u3001\u62bd\u8c61\u7684\u306a\u7406\u8ad6\u3067\u306f\u306a\u304f\u5b9f\u8df5\u7684\u306a\u5fdc\u7528\u306b\u91cd\u70b9\u3092\u7f6e\u3044\u3066\u3044\u308b\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Marker-style infographic teaching backend developers how to read Entity Relationship Diagrams (ERDs), featuring visual explanations of entities, attributes, relationships, cardinality types (one-to-one, one-to-many, many-to-many), crow's foot notation symbols, primary and foreign keys, normalization concepts, and backend optimization tips in a colorful hand-drawn illustration style\" decoding=\"async\" src=\"https:\/\/www.viz-read.com\/wp-content\/uploads\/2026\/03\/erd-reading-guide-backend-developers-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>ERD\u306e\u30b3\u30a2\u3068\u306a\u308b\u8981\u7d20\u3092\u7406\u89e3\u3059\u308b 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\ud83d\udd17<\/h2>\n<p>\u57fa\u6570\u306fERD\u306e\u6838\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u95a2\u4fc2\u6027\u306b\u304a\u3051\u308b\u5236\u7d04\u3084\u8ad6\u7406\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u57fa\u6570\u3092\u8aa4\u89e3\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3084\u5b64\u7acb\u30ec\u30b3\u30fc\u30c9\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3042\u306a\u305f\u304c\u906d\u9047\u3059\u308b\u3067\u3042\u308d\u30463\u3064\u306e\u4e3b\u8981\u306a\u95a2\u4fc2\u6027\u306e\u7a2e\u985e\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>1. 1\u5bfe1\uff081:1\uff09<\/h3>\n<p>Table A\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u304cTable B\u306e\u6b63\u78ba\u306b1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u9023\u3057\u3001\u305d\u306e\u9006\u3082\u6210\u308a\u7acb\u3064\u5834\u5408\u306b\u3053\u306e\u95a2\u4fc2\u6027\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u4f8b\uff1a<\/strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u305f\u3081\u3001\u5927\u304d\u306a\u30c6\u30fc\u30d6\u30eb\u3092\u5206\u5272\u3059\u308b\u3002\u4f8b\u3048\u3070\u3001<em>User<\/em>\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u306f\u3001<em>User_Settings<\/em>\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u5206\u96e2\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308b\u3002<\/li>\n<li><strong>\u5b9f\u88c5\u65b9\u6cd5\uff1a<\/strong>1\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u5916\u90e8\u30ad\u30fc\u304c\u3001\u3082\u30461\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3057\u3001\u3057\u3070\u3057\u3070\u4e00\u610f\u5236\u7d04\u304c\u4ed8\u52a0\u3055\u308c\u308b\u3002<\/li>\n<li><strong>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3078\u306e\u5f71\u97ff\uff1a<\/strong>\u5b8c\u5168\u306a\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u7d50\u5408\u304c\u901a\u5e38\u5fc5\u8981\u3067\u3059\u304c\u3001\u8ad6\u7406\u306f\u660e\u78ba\u3067\u3059\u3002<\/li>\n<\/ul>\n<h3>2. 1\u5bfe\u591a\uff081:N\uff09<\/h3>\n<p>\u3053\u308c\u306f\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u6700\u3082\u4e00\u822c\u7684\u306a\u95a2\u4fc2\u6027\u3067\u3059\u3002Table A\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u306f\u3001Table B\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u95a2\u9023\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u304c\u3001Table B\u306e\u5404\u30ec\u30b3\u30fc\u30c9\u306fTable A\u306e1\u3064\u306e\u30ec\u30b3\u30fc\u30c9\u306b\u306e\u307f\u95a2\u9023\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u4f8b\uff1a<\/strong> 1\u3064\u306e<em>Category<\/em> \u306b\u8907\u6570\u306e<em>Products<\/em>.<\/li>\n<li><strong>\u5b9f\u88c5:<\/strong> 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\u306e\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u3068\u30ea\u30f3\u30af\u53ef\u80fd\u3067\u3042\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u4f8b:<\/strong> \u5b66\u751f\u304c\u8907\u6570\u306e\u6388\u696d\u306b\u767b\u9332\u3057\u3001\u6388\u696d\u304c\u8907\u6570\u306e\u5b66\u751f\u3092\u6301\u3064\u3002<\/li>\n<li><strong>\u5b9f\u88c5:<\/strong> \u3053\u308c\u306f\u5358\u4e00\u306e\u5916\u90e8\u30ad\u30fc\u3067\u306f\u76f4\u63a5\u8868\u73fe\u3067\u304d\u307e\u305b\u3093\u3002\u95a2\u4fc2\u3092\u4e8c\u3064\u306e1\u5bfe\u591a\u95a2\u4fc2\u306b\u5206\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\uff08\u307e\u305f\u306f\u30d6\u30ea\u30c3\u30b8\u30c6\u30fc\u30d6\u30eb\uff09\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<li><strong>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3078\u306e\u5f71\u97ff:<\/strong> \u30af\u30a8\u30ea\u306f\u3057\u3070\u3057\u30703\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u542b\u307f\u307e\u3059\u3002\u95a2\u9023\u4ed8\u3051\u3092\u7ba1\u7406\u3059\u308b\u305f\u3081\u306b\u3001\u30b3\u30fc\u30c9\u5185\u3067\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3092\u660e\u793a\u7684\u306b\u6271\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h4>\u8868\uff1a\u95a2\u4fc2\u306e\u57fa\u6570\u306e\u8981\u7d04<\/h4>\n<table>\n<thead>\n<tr>\n<th>\u95a2\u4fc2\u306e\u7a2e\u985e<\/th>\n<th>\u4f8b\u306e\u30b7\u30ca\u30ea\u30aa<\/th>\n<th>\u5b9f\u88c5\u6226\u7565<\/th>\n<th>\u30af\u30a8\u30ea\u306e\u8907\u96d1\u3055<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1\u5bfe1\uff081:1\uff09<\/td>\n<td>\u30e6\u30fc\u30b6\u30fc\u3068\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb<\/td>\n<td>\u4e00\u610f\u306e\u5916\u90e8\u30ad\u30fc<\/td>\n<td>\u4f4e\uff08\u5358\u4e00\u7d50\u5408\uff09<\/td>\n<\/tr>\n<tr>\n<td>1\u5bfe\u591a\uff081:N\uff09<\/td>\n<td>\u8457\u8005\u3068\u672c<\/td>\n<td>\u591a\u6570\u5074\u3078\u306e\u5916\u90e8\u30ad\u30fc<\/td>\n<td>\u4e2d\uff08\u30ea\u30b9\u30c8\u7d50\u5408\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u5bfe\u591a\uff08M:N\uff09<\/td>\n<td>\u5b66\u751f\u3068\u6388\u696d<\/td>\n<td>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb<\/td>\n<td>\u9ad8\uff083\u30c6\u30fc\u30d6\u30eb\u7d50\u5408\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u8868\u8a18\u30b9\u30bf\u30a4\u30eb\u3068\u8a18\u53f7 \ud83d\udcd0<\/h2>\n<p>\u6982\u5ff5\u306f\u4e00\u8cab\u3057\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u56f3\u306e\u8996\u899a\u7684\u8868\u8a18\u306f\u8ab0\u304c\u8a2d\u8a08\u3057\u305f\u304b\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u306b\u7cbe\u901a\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u5fae\u7d30\u306a\u8a73\u7d30\u3092\u898b\u9003\u3059\u3053\u3068\u3092\u9632\u3052\u307e\u3059\u3002<\/p>\n<h3>\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u8868\u8a18<\/h3>\n<p>\u3053\u308c\u306f\u73fe\u4ee3\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u8a2d\u8a08\u30c4\u30fc\u30eb\u3067\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u95a2\u4fc2\u7dda\u306e\u7aef\u306b\u7279\u5b9a\u306e\u8a18\u53f7\u3092\u4f7f\u7528\u3057\u3066\u3001\u57fa\u6570\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u5358\u7dda\uff1a<\/strong> \u300c1\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> \u300c\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\uff08\u30bc\u30ed\uff09\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li><strong>\u5782\u76f4\u30d0\u30fc\uff1a<\/strong> \u300c\u5fc5\u9808\u300d\uff081\uff09\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u305f\u3068\u3048\u3070\u3001\u7247\u5074\u306b\u5782\u76f4\u30d0\u30fc\u3001\u3082\u3046\u7247\u5074\u306b\u30af\u30ed\u30a6\u30ba\u30d5\u30c3\u30c8\u304c\u3042\u308b\u7dda\u306f\u3001\u300e1\u5bfe\u591a\u300f\u306e\u95a2\u4fc2\u3092\u793a\u3057\u3001\u300e1\u300f\u5074\u304c\u5fc5\u9808\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30c1\u30a7\u30f3\u8868\u8a18<\/h3>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u306f\u3042\u307e\u308a\u4f7f\u308f\u308c\u306a\u3044\u304c\u3001\u5b66\u8853\u7684\u307e\u305f\u306f\u9ad8\u30ec\u30d9\u30eb\u306e\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u7684\u6587\u8108\u3067\u306f\u3088\u304f\u898b\u3089\u308c\u308b\u3002\u95a2\u4fc2\u3092\u7dda\u3067\u306f\u306a\u304f\u3001\u83f1\u5f62\u3067\u8868\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff1a<\/strong>\u9577\u65b9\u5f62\u3002<\/li>\n<li><strong>\u95a2\u4fc2\uff1a<\/strong>\u83f1\u5f62\u3002<\/li>\n<li><strong>\u5c5e\u6027\uff1a<\/strong>\u6955\u5186\u3002<\/li>\n<\/ul>\n<p>\u30c1\u30a7\u30f3\u8868\u8a18\u3092\u8aad\u3080\u969b\u306f\u3001\u83f1\u5f62\u306e\u5f62\u72b6\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u57fa\u6570\u30e9\u30d9\u30eb\uff081\u3001N\u3001M\uff09\u306f\u3001\u83f1\u5f62\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7d50\u3076\u7dda\u306e\u4e0a\u306b\u914d\u7f6e\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30ad\u30fc\u3068\u5236\u7d04\uff1a\u30eb\u30fc\u30eb\u306e\u4e16\u754c \ud83d\udd11<\/h2>\n<p>ERD\u306f\u3064\u306a\u304c\u308a\u3060\u3051\u3092\u6271\u3046\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30eb\u30fc\u30eb\u306e\u4e16\u754c\u3067\u3059\u3002\u5236\u7d04\u306f\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u958b\u767a\u8005\u3068\u3057\u3066\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u5f37\u5236\u3059\u308b\u5236\u7d04\u3068\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3067\u51e6\u7406\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5236\u7d04\u3092\u628a\u63e1\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u4e3b\u30ad\u30fc\uff08PK\uff09<\/h3>\n<p>\u3059\u3079\u3066\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u306f\u4e3b\u30ad\u30fc\u304c\u5fc5\u8981\u3067\u3059\u3002\u3053\u306e\u5024\u304c\u5404\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3057\u307e\u3059\u3002ERD\u3092\u8aad\u3080\u969b\u306f\u3001\u4e0b\u7dda\u304c\u5f15\u304b\u308c\u305f\u5c5e\u6027\u3092\u63a2\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li><strong>\u4ee3\u66ff\u30ad\u30fc\uff1a<\/strong>\u30d3\u30b8\u30cd\u30b9\u4e0a\u306e\u610f\u5473\u3092\u6301\u305f\u306a\u3044\u81ea\u52d5\u5897\u5206\u6574\u6570\uff08\u4f8b\uff1aID\uff09<\/li>\n<li><strong>\u81ea\u7136\u30ad\u30fc\uff1a<\/strong>\u672c\u6765\u304b\u3089\u4e00\u610f\u3067\u3042\u308b\u30d3\u30b8\u30cd\u30b9\u8b58\u5225\u5b50\uff08\u4f8b\uff1a\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3001SKU\uff09<\/li>\n<\/ul>\n<p><strong>\u306a\u305c\u91cd\u8981\u306a\u306e\u304b\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u306f\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3057\u307e\u3059\u3002\u4e3b\u30ad\u30fc\u306e\u6226\u7565\uff08\u4f8b\uff1aUUID vs. \u6574\u6570\uff09\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u3001\u3059\u3079\u3066\u306e\u4f9d\u5b58\u3059\u308b\u5916\u90e8\u30ad\u30fc\u3092\u66f4\u65b0\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30ec\u30a4\u30e4\u30fc\u3092\u518d\u69cb\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h3>\u5916\u90e8\u30ad\u30fc\uff08FK\uff09<\/h3>\n<p>\u5916\u90e8\u30ad\u30fc\u3068\u306f\u3001\u3042\u308b\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\uff08\u307e\u305f\u306f\u8907\u6570\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\uff09\u3067\u3001\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u3092\u53c2\u7167\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u53c2\u7167\u6574\u5408\u6027\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>ON DELETE CASCADE\uff1a<\/strong> \u89aa\u30ec\u30b3\u30fc\u30c9\u304c\u524a\u9664\u3055\u308c\u308b\u3068\u3001\u5b50\u30ec\u30b3\u30fc\u30c9\u3082\u81ea\u52d5\u7684\u306b\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>ON DELETE RESTRICT\uff1a<\/strong> \u5b50\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u3001\u89aa\u306e\u524a\u9664\u3092\u7981\u6b62\u3057\u307e\u3059\u3002<\/li>\n<li><strong>ON DELETE SET NULL\uff1a<\/strong> \u89aa\u304c\u524a\u9664\u3055\u308c\u305f\u5834\u5408\u3001\u5916\u90e8\u30ad\u30fc\u5217\u3092NULL\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u524a\u9664\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u306f\u3001\u3053\u308c\u3089\u306e\u52d5\u4f5c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u95a2\u4fc2\u30b0\u30e9\u30d5\u304c\u8907\u96d1\u306a\u5834\u5408\u3001\u30ab\u30b9\u30b1\u30fc\u30c9\u524a\u9664\u306f\u4e88\u671f\u3057\u306a\u3044\u526f\u4f5c\u7528\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u6b63\u898f\u5316\u3068\u30c7\u30fc\u30bf\u69cb\u9020 \ud83e\uddf9<\/h2>\n<p>ERD\u3092\u5206\u6790\u3059\u308b\u969b\u306b\u306f\u3001\u6b63\u898f\u5316\u306e\u30ec\u30d9\u30eb\u3082\u8a55\u4fa1\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u6b63\u898f\u5316\u306f\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3092\u6e1b\u3089\u3057\u3001\u6574\u5408\u6027\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u305f\u3081\u306b\u306f\u5fc5\u305a\u3057\u3082\u53b3\u5bc6\u306a\u8981\u4ef6\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>\u7b2c\u4e00\u6b63\u898f\u5f62\uff081NF\uff09<\/h3>\n<p>\u3059\u3079\u3066\u306e\u5217\u306f\u539f\u5b50\u5024\u3092\u542b\u3080\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u30021\u3064\u306e\u30bb\u30eb\u306b\u30ea\u30b9\u30c8\u3084\u914d\u5217\u3092\u542b\u3081\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u5217\u540d\u304c\u300c<em>tags<\/em>\u300d\u306b\u300c<em>tag1, tag2, tag3\u300d\u306e\u3088\u3046\u306a\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30b9\u30ad\u30fc\u30de\u306f1NF\u306b\u9055\u53cd\u3057\u3066\u3044\u307e\u3059\u3002<\/em>\u300d\u306b\u300ctag1, tag2, tag3\u300d\u306e\u3088\u3046\u306a\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30b9\u30ad\u30fc\u30de\u306f1NF\u306b\u9055\u53cd\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u7b2c\u4e8c\u6b63\u898f\u5f62\uff082NF\uff09<\/h3>\n<p>1NF\u306b\u6e96\u62e0\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u3059\u3079\u3066\u306e\u975e\u30ad\u30fc\u5c5e\u6027\u306f\u4e3b\u30ad\u30fc\u306b\u5b8c\u5168\u306b\u4f9d\u5b58\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u8907\u5408\u30ad\u30fc\u306e\u4e00\u90e8\u306b\u306e\u307f\u4f9d\u5b58\u3059\u308b\u5c5e\u6027\u3092\u5225\u30c6\u30fc\u30d6\u30eb\u306b\u79fb\u52d5\u3059\u308b\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<h3>\u7b2c\u4e09\u6b63\u898f\u5f62\uff083NF\uff09<\/h3>\n<p>2NF\u306b\u6e96\u62e0\u3057\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u63a8\u79fb\u7684\u4f9d\u5b58\u95a2\u4fc2\u304c\u5b58\u5728\u3057\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u3082\u3057<em>A<\/em>\u304c<em>B<\/em>\u3092\u6c7a\u5b9a\u3057\u3001<em>B<\/em>\u304c<em>C<\/em>\u3001\u305d\u306e\u5f8c<em>A<\/em>\u306f\u2026\u3092\u6c7a\u5b9a\u3059\u308b<em>C<\/em>\u30023NF\u3067\u306f\u3001<em>C<\/em>\u306f\u3001\u540c\u3058\u30c6\u30fc\u30d6\u30eb\u5185\u306b\u5b58\u5728\u3057\u3066\u306f\u306a\u3089\u306a\u3044<em>B<\/em>.<\/p>\n<h4>\u5b9f\u8df5\u306b\u304a\u3051\u308b\u975e\u6b63\u898f\u5316<\/h4>\n<p>\u6b63\u898f\u5316\u306f\u7406\u8ad6\u4e0a\u306e\u7406\u60f3\u3067\u3042\u308b\u304c\u3001\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u958b\u767a\u3067\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a\u306e\u305f\u3081\u3001\u975e\u6b63\u898f\u5316\u3092\u5fc5\u8981\u3068\u3059\u308b\u5834\u5408\u304c\u591a\u3044\u3002\u30b9\u30d4\u30fc\u30c9\u3092\u91cd\u8996\u3057\u305fERD\u3067\u306f\u3001\u91cd\u8907\u30c7\u30fc\u30bf\u304c\u898b\u3089\u308c\u308b\u3053\u3068\u304c\u3042\u308b\u3002<\/p>\n<ul>\n<li><strong>\u8aad\u307f\u8fbc\u307f vs. \u66f8\u304d\u8fbc\u307f\uff1a<\/strong>\u6b63\u898f\u5316\u3055\u308c\u305f\u30b9\u30ad\u30fc\u30de\u306f\u66f8\u304d\u8fbc\u307f\u306b\u9069\u3057\u3066\u3044\u308b\u3002\u975e\u6b63\u898f\u5316\u3055\u308c\u305f\u30b9\u30ad\u30fc\u30de\u306f\u8aad\u307f\u8fbc\u307f\u306b\u9069\u3057\u3066\u3044\u308b\u3002<\/li>\n<li><strong>\u30ad\u30e3\u30c3\u30b7\u30e5\uff1a<\/strong>\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u9ad8\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3067\u306eJOIN\u64cd\u4f5c\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b\u3001\u30c7\u30fc\u30bf\u3092\u91cd\u8907\u3055\u305b\u308b\u3053\u3068\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<p>ERD\u306b\u5197\u9577\u306a\u30c7\u30fc\u30bf\u304c\u898b\u3089\u308c\u305f\u3089\u3001\u305d\u306e\u7406\u7531\u3092\u554f\u3044\u76f4\u3059\u3079\u304d\u3060\u3002\u3053\u308c\u306f\u8a2d\u8a08\u4e0a\u306e\u6b20\u9665\u306a\u306e\u304b\u3001\u305d\u308c\u3068\u3082\u610f\u56f3\u7684\u306a\u6700\u9069\u5316\u6226\u7565\u306a\u306e\u304b\u3002<\/p>\n<h2>\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u8aad\u307f\u65b9 \ud83d\ude80<\/h2>\n<p>ERD\u3092\u8aad\u3080\u3053\u3068\u306f\u3001\u30c7\u30fc\u30bf\u306e\u4fdd\u5b58\u65b9\u6cd5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3060\u3051\u3067\u306f\u306a\u3044\u3002\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u4e88\u6e2c\u3059\u308b\u3053\u3068\u3067\u3082\u3042\u308b\u3002\u9069\u5207\u306b\u8aad\u307f\u89e3\u304b\u308c\u305f\u30b9\u30ad\u30fc\u30de\u304c\u3042\u308c\u3070\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3067\u304d\u308b\u30af\u30a8\u30ea\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n<h3>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u306e\u6a5f\u4f1a\u3092\u7279\u5b9a\u3059\u308b<\/h3>\n<p>\u691c\u7d22\u30d5\u30a3\u30eb\u30bf\u30fc\u3084\u4e26\u3079\u66ff\u3048\u64cd\u4f5c\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u5c5e\u6027\u3092\u63a2\u305b\u3002\u3053\u308c\u3089\u306e\u5c5e\u6027\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3059\u3079\u304d\u3067\u3042\u308b\u3002<\/p>\n<ul>\n<li><strong>\u691c\u7d22\u30ab\u30e9\u30e0\uff1a<\/strong>WHERE\u53e5\u3067\u4f7f\u7528\u3055\u308c\u308b\u5c5e\u6027\u3002<\/li>\n<li><strong>\u7d50\u5408\u30ab\u30e9\u30e0\uff1a<\/strong>\u5916\u90e8\u30ad\u30fc\u306f\u307b\u3068\u3093\u3069\u5e38\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3055\u308c\u3001JOIN\u306e\u9ad8\u901f\u5316\u306b\u5f79\u7acb\u3064\u3002<\/li>\n<li><strong>\u4e26\u3079\u66ff\u3048\u30ab\u30e9\u30e0\uff1a<\/strong>ORDER BY\u53e5\u3067\u4f7f\u7528\u3055\u308c\u308b\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<h3>N+1\u30af\u30a8\u30ea\u306e\u56de\u907f<\/h3>\n<p>ERD\u306f\u95a2\u4fc2\u69cb\u9020\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u30021\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u3042\u308b\u5834\u5408\u3001\u89aa\u3092\u53d6\u5f97\u3057\u3066\u304b\u3089\u30eb\u30fc\u30d7\u3067\u5b50\u3092\u500b\u5225\u306b\u53d6\u5f97\u3059\u308b\u3068\u3001N+1\u30af\u30a8\u30ea\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n<ul>\n<li><strong>\u89e3\u6c7a\u7b56\uff1a<\/strong>ERD\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u4fc2\u30d1\u30b9\u306b\u57fa\u3065\u3044\u3066\u3001\u30a8\u30a4\u30b8\u30f3\u30b0\u30ed\u30fc\u30c9\u307e\u305f\u306f\u660e\u793a\u7684\u306aJOIN\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<li><strong>\u8b66\u544a\uff1a<\/strong> \u8907\u96d1\u306a\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u3001\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u304c\u4e21\u65b9\u306e\u5916\u90e8\u30ad\u30fc\u5217\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u5f35\u3089\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u7c21\u5358\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u30b9\u30ad\u30fc\u30de\u8a2d\u8a08\u306b\u304a\u3051\u308b\u4e00\u822c\u7684\u306a\u843d\u3068\u3057\u7a74 \u26a0\ufe0f<\/h2>\n<p>\u7d4c\u9a13\u8c4a\u5bcc\u306a\u30a2\u30fc\u30ad\u30c6\u30af\u30c8\u3067\u3059\u3089\u30df\u30b9\u3092\u72af\u3057\u307e\u3059\u3002ERD\u3092\u8aad\u3080\u969b\u306f\u3001\u5f8c\u3067\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u306e\u3042\u308b\u60aa\u3044\u8a2d\u8a08\u306e\u5146\u5019\u3092\u63a2\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>1. \u5186\u74b0\u4f9d\u5b58<\/h3>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u306b\u4f9d\u5b58\u3057\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3B\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3A\u306b\u4f9d\u5b58\u3059\u308b\u5834\u5408\u3001\u5186\u74b0\u4f9d\u5b58\u304c\u751f\u3058\u307e\u3059\u3002\u3053\u308c\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u30b3\u30df\u30c3\u30c8\u4e2d\u306b\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u3092\u5f15\u304d\u8d77\u3053\u3059\u304b\u3001\u8907\u96d1\u306a\u521d\u671f\u5316\u30ed\u30b8\u30c3\u30af\u3092\u5fc5\u8981\u3068\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>2. \u30d0\u30e9\u30f3\u30b9\u306e\u53d6\u308c\u3066\u3044\u306a\u3044\u57fa\u6570<\/h3>\n<p>\u6642\u6298\u3001\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u3001\u4e21\u65b9\u5411\u306b\u4e00\u5bfe\u591a\u3068\u3057\u3066\u8aa4\u3063\u3066\u30e2\u30c7\u30eb\u5316\u3055\u308c\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3084\u60c5\u5831\u306e\u55aa\u5931\u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\u3002<\/p>\n<h3>3. \u30e1\u30bf\u30c7\u30fc\u30bf\u306e\u6b20\u843d<\/h3>\n<p>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\uff08created_at\u3001updated_at\uff09\u304c\u6b20\u3051\u305fERD\u306f\u3001\u76e3\u67fb\u3084\u30c7\u30d0\u30c3\u30b0\u3092\u56f0\u96e3\u306b\u3057\u307e\u3059\u3002\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u30bd\u30d5\u30c8\u30c7\u30ea\u30fc\u30c8\u3084\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406\u306e\u305f\u3081\u306b\u3053\u306e\u30c7\u30fc\u30bf\u3092\u3057\u3070\u3057\u3070\u5fc5\u8981\u3068\u3057\u307e\u3059\u3002<\/p>\n<h3>4. \u904e\u5270\u6b63\u898f\u5316<\/h3>\n<p>\u30c6\u30fc\u30d6\u30eb\u304c\u591a\u3059\u304e\u308b\u3068\u3001\u5358\u7d14\u306a\u30af\u30a8\u30ea\u3067\u3082\u904e\u5270\u306a\u7d50\u5408\u3092\u5fc5\u8981\u3068\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u901f\u5ea6\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u540c\u3058\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u6301\u3064\u30c6\u30fc\u30d6\u30eb\u306f\u8ad6\u7406\u7684\u306b\u7d71\u5408\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u5b9f\u8df5\u7684\u5fdc\u7528\uff1a\u56f3\u304b\u3089\u30b3\u30fc\u30c9\u3078 \ud83d\udcbb<\/h2>\n<p>ERD\u3092\u7406\u89e3\u3057\u305f\u3089\u3001\u6b21\u306b\u305d\u306e\u5185\u5bb9\u3092\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u306b\u5909\u63db\u3059\u308b\u6bb5\u968e\u3067\u3059\u3002\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u306f\u3001\u8996\u899a\u7684\u306a\u30e2\u30c7\u30eb\u3092\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3057\u307e\u3059\u3002<\/p>\n<h3>1. \u30e2\u30c7\u30eb\u30de\u30c3\u30d4\u30f3\u30b0<\/h3>\n<p>\u5404\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u30b3\u30fc\u30c9\u5185\u306e\u30af\u30e9\u30b9\u307e\u305f\u306f\u30e2\u30c7\u30eb\u306b\u306a\u308a\u307e\u3059\u3002\u5c5e\u6027\u306f\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306a\u308a\u307e\u3059\u3002\u95a2\u4fc2\u306f\u95a2\u9023\u4ed8\u3051\u3084\u30e1\u30bd\u30c3\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>1\u5bfe1\uff1a<\/strong> \u5358\u4e00\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d7\u30ed\u30d1\u30c6\u30a3\u3002<\/li>\n<li><strong>1\u5bfe\u591a\uff1a<\/strong> \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u307e\u305f\u306f\u30ea\u30b9\u30c8\u30d7\u30ed\u30d1\u30c6\u30a3\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\uff1a<\/strong> \u30d6\u30ea\u30c3\u30b8\u3092\u4ecb\u3057\u3066\u95a2\u9023\u30e2\u30c7\u30eb\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3002<\/li>\n<\/ul>\n<h3>2. API\u8a2d\u8a08<\/h3>\n<p>ERD\u304cAPI\u306e\u69cb\u9020\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002\u6b63\u898f\u5316\u3055\u308c\u305f\u30b9\u30ad\u30fc\u30de\u306f\u3001\u30cd\u30b9\u30c8\u3055\u308c\u305fJSON\u5fdc\u7b54\u3084\u95a2\u9023\u30ea\u30bd\u30fc\u30b9\u306e\u305f\u3081\u306e\u5225\u3005\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092\u3082\u305f\u3089\u3059\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001<code>\/orders<\/code> \u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306b\u306f\u3001<code>\/order-items<\/code> \u3068\u3044\u3046\u30cd\u30b9\u30c8\u69cb\u9020\u3092\u542b\u3080\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>3. \u691c\u8a3c\u30ed\u30b8\u30c3\u30af<\/h3>\n<p>ERD\u5185\u306e\u5236\u7d04\uff08NOT NULL\u306a\u3069\uff09\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ec\u30d9\u30eb\u306e\u691c\u8a3c\u306b\u3082\u53cd\u6620\u3055\u308c\u308b\u3079\u304d\u3067\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304cNULL\u5024\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\u304c\u3001\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3067\u5024\u304c\u5fc5\u8981\u306a\u5834\u5408\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u30c7\u30fc\u30bf\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u9001\u4fe1\u3059\u308b\u524d\u306b\u305d\u306e\u30eb\u30fc\u30eb\u3092\u5f37\u5236\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u6642\u9593\u306e\u7d4c\u904e\u306b\u4f34\u3046\u30b9\u30ad\u30fc\u30de\u306e\u6574\u5408\u6027\u306e\u7dad\u6301 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