{"id":1598,"date":"2026-03-27T07:30:44","date_gmt":"2026-03-27T07:30:44","guid":{"rendered":"https:\/\/www.go-diagram.com\/ja\/common-erd-design-mistakes-and-how-to-avoid-them\/"},"modified":"2026-03-27T07:30:44","modified_gmt":"2026-03-27T07:30:44","slug":"common-erd-design-mistakes-and-how-to-avoid-them","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/ja\/common-erd-design-mistakes-and-how-to-avoid-them\/","title":{"rendered":"ERD\u8a2d\u8a08\u306b\u304a\u3051\u308b\u4e00\u822c\u7684\u306a\u30df\u30b9\u3068\u305d\u306e\u56de\u907f\u65b9\u6cd5"},"content":{"rendered":"<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u95a2\u4fc2\u56f3\uff08ERD\uff09\u306f\u3001\u3044\u304b\u306a\u308b\u5805\u7262\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b7\u30b9\u30c6\u30e0\u306e\u57fa\u76e4\u3068\u306a\u308b\u8a2d\u8a08\u56f3\u3067\u3059\u3002\u30c7\u30fc\u30bf\u306e\u69cb\u9020\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u3001\u304a\u3088\u3073\u76f8\u4e92\u4f5c\u7528\u3092\u5236\u5fa1\u3059\u308b\u5236\u7d04\u3092\u8996\u899a\u7684\u306b\u8868\u73fe\u3057\u307e\u3059\u3002\u9069\u5207\u306b\u5b9f\u884c\u3055\u308c\u305f\u5834\u5408\u3001ERD\u306f\u30c7\u30fc\u30bf\u6574\u5408\u6027\u3001\u30af\u30a8\u30ea\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u3092\u78ba\u4fdd\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u6bb5\u968e\u3067\u8a2d\u8a08\u4e0a\u306e\u6b20\u9665\u304c\u3042\u308b\u3068\u3001\u958b\u767a\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u5168\u4f53\u306b\u308f\u305f\u3063\u3066\u305d\u306e\u5f71\u97ff\u304c\u62e1\u5927\u3057\u3001\u9ad8\u30b3\u30b9\u30c8\u306a\u518d\u8a2d\u8a08\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3001\u30c7\u30fc\u30bf\u306e\u7834\u640d\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u30ac\u30a4\u30c9\u3067\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30ad\u30fc\u30de\u8a2d\u8a08\u306b\u304a\u3051\u308b\u983b\u767a\u3059\u308b\u8aa4\u308a\u3092\u691c\u8a0e\u3057\u3001\u9ad8\u3044\u57fa\u6e96\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306e\u5b9f\u884c\u53ef\u80fd\u306a\u6226\u7565\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Line art infographic illustrating 6 common Entity Relationship Diagram design mistakes: ambiguous relationships, normalization balance issues, naming convention chaos, cardinality misinterpretation, data type inconsistencies, and key management errors\u2014each paired with actionable solutions and a pre-implementation checklist for robust database schema design\" decoding=\"async\" src=\"https:\/\/www.go-diagram.com\/wp-content\/uploads\/2026\/03\/erd-design-mistakes-infographic-line-art-16x9-1.jpg\"\/><\/figure>\n<\/div>\n<h2>1. \u4e0d\u660e\u78ba\u306a\u95a2\u4fc2\u5b9a\u7fa9 \ud83e\udd14<\/h2>\n<p>\u6700\u3082\u4e00\u822c\u7684\u306a\u554f\u984c\u306e\u4e00\u3064\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u95a2\u4fc2\u304c\u4e0d\u660e\u77ad\u307e\u305f\u306f\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u3067\u3059\u3002\u95a2\u4fc2\u3068\u306f\u3001\u3042\u308b\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u304c\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3068\u3069\u306e\u3088\u3046\u306b\u95a2\u9023\u3057\u3066\u3044\u308b\u304b\u3092\u5b9a\u7fa9\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u306e\u63a5\u7d9a\u304c\u66d6\u6627\u306a\u5834\u5408\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30f3\u30b8\u30f3\u306f\u53c2\u7167\u6574\u5408\u6027\u3092\u5f37\u5236\u3067\u304d\u305a\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u304c\u8106\u5f31\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u306e\u6b20\u5982\uff1a<\/strong>\u95a2\u4fc2\u304c1\u5bfe1\u30011\u5bfe\u591a\u3001\u307e\u305f\u306f\u591a\u5bfe\u591a\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u660e\u793a\u3057\u306a\u3044\u3068\u3001\u66d6\u6627\u3055\u304c\u751f\u3058\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u30011\u4eba\u306e\u9867\u5ba2\u304c\u8907\u6570\u306e\u6ce8\u6587\u3092\u6240\u6709\u3059\u308b\u306e\u304b\u3001\u305d\u308c\u3068\u30821\u3064\u307e\u3067\u306b\u5236\u9650\u3055\u308c\u308b\u306e\u304b\u3002\u660e\u78ba\u306a\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u304c\u306a\u3051\u308c\u3070\u3001\u958b\u767a\u8005\u306f\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3068\u4e00\u81f4\u3057\u306a\u3044\u4eee\u5b9a\u3092\u4e0b\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u30e9\u30d9\u30eb\u306e\u306a\u3044\u7dda\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u7d50\u3076ERD\u306e\u7dda\u306f\u3001\u5e38\u306b\u95a2\u4fc2\u306e\u6027\u8cea\u3092\u30e9\u30d9\u30eb\u3067\u793a\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u5358\u306a\u308b\u7dda\u3067\u306f\u3001\u30c7\u30fc\u30bf\u306e\u91cf\u3084\u95a2\u4fc2\u306e\u65b9\u5411\u306b\u95a2\u3059\u308b\u6587\u8108\u304c\u4e00\u5207\u63d0\u4f9b\u3055\u308c\u307e\u305b\u3093\u3002<\/li>\n<li><strong>\u591a\u5bfe\u591a\u95a2\u4fc2\u306e\u8aa4\u3063\u305f\u6271\u3044\uff1a<\/strong>\u3088\u304f\u3042\u308b\u8aa4\u308a\u306f\u3001\u591a\u5bfe\u591a\u95a2\u4fc2\u30922\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u9593\u306b\u76f4\u63a5\u8868\u73fe\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3001\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u4ecb\u3055\u305a\u306b\u3053\u306e\u95a2\u4fc2\u3092\u30cd\u30a4\u30c6\u30a3\u30d6\u306b\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30c7\u30fc\u30bf\u306e\u7c92\u5ea6\u304c\u5931\u308f\u308c\u3001\u4e2d\u9593\u72b6\u614b\u3092\u8ffd\u8de1\u3059\u308b\u306e\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>\u95a2\u4fc2\u306b\u95a2\u3059\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n<p>\u66d6\u6627\u3055\u3092\u89e3\u6d88\u3059\u308b\u305f\u3081\u3001\u3059\u3079\u3066\u306e\u63a5\u7d9a\u7dda\u304c\u6700\u5c0f\u53c2\u52a0\u6570\u3068\u6700\u5927\u53c2\u52a0\u6570\u3092\u660e\u793a\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u591a\u5bfe\u591a\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u306f\u4e21\u65b9\u306e\u89aa\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3092\u4fdd\u6301\u3057\u30012\u3064\u306e\u660e\u78ba\u306a1\u5bfe\u591a\u95a2\u4fc2\u3092\u69cb\u7bc9\u3057\u307e\u3059\u3002\u3053\u306e\u69cb\u9020\u306b\u3088\u308a\u3001\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3084\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30e9\u30b0\u306a\u3069\u3001\u95a2\u4fc2\u81ea\u4f53\u306b\u8ffd\u52a0\u306e\u5c5e\u6027\u3092\u8a2d\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>2. \u6b63\u898f\u5316\u306e\u30d0\u30e9\u30f3\u30b9\u306e\u554f\u984c \u2696\ufe0f<\/h2>\n<p>\u6b63\u898f\u5316\u3068\u306f\u3001\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u3092\u6e1b\u3089\u3057\u3001\u6574\u5408\u6027\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u30c7\u30fc\u30bf\u3092\u6574\u7406\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u904b\u7528\u4e0a\u306e\u6587\u8108\u3092\u8003\u616e\u305b\u305a\u306b\u6b63\u898f\u5316\u30eb\u30fc\u30eb\u3092\u53b3\u5bc6\u306b\u9069\u7528\u3059\u308b\u3068\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u4f4e\u4e0b\u3092\u62db\u304f\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u9006\u306b\u3001\u6b63\u898f\u5316\u3092\u5b8c\u5168\u306b\u7121\u8996\u3059\u308b\u3068\u3001\u7570\u5e38\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u904e\u5270\u306a\u6b63\u898f\u5316\uff1a<\/strong>\u30c6\u30fc\u30d6\u30eb\u3092\u591a\u3059\u304e\u308b\u3068\u3001\u57fa\u672c\u7684\u306a\u60c5\u5831\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u8907\u96d1\u306a\u7d50\u5408\u3092\u5f37\u3044\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u30011\u4eba\u306e\u30e6\u30fc\u30b6\u30fc\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b10\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u8aad\u307f\u53d6\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u8457\u3057\u304f\u4f4e\u4e0b\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30c7\u30b6\u30a4\u30ca\u30fc\u304c\u7b2c\u4e09\u6b63\u898f\u5f62\uff083NF\uff09\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u3059\u3079\u3066\u306e\u5c5e\u6027\u3092\u500b\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u6b63\u898f\u5316\u3059\u308b\u304c\u3001\u5b9f\u969b\u306e\u691c\u8a3c\u3092\u884c\u308f\u306a\u3044\u5834\u5408\u306b\u3088\u304f\u8d77\u3053\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u4e0d\u5341\u5206\u306a\u6b63\u898f\u5316\uff1a<\/strong>\u9867\u5ba2\u306e\u4f4f\u6240\u3092\u3059\u3079\u3066\u306e\u6ce8\u6587\u30c6\u30fc\u30d6\u30eb\u306b\u91cd\u8907\u3057\u3066\u4fdd\u5b58\u3059\u308b\u306a\u3069\u3001\u5197\u9577\u306a\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u3068\u3001\u66f4\u65b0\u7570\u5e38\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u9867\u5ba2\u304c\u5f15\u8d8a\u3057\u3057\u305f\u5834\u5408\u3001\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u66f4\u65b0\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u3092\u6020\u308b\u3068\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u304c\u4fdd\u3066\u305a\u3001\u4e00\u8cab\u6027\u306e\u306a\u3044\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u8aad\u307f\u8fbc\u307f\u304c\u91cd\u3044\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u306b\u304a\u3044\u3066\u30c7\u30ce\u30fc\u30de\u30e9\u30a4\u30ba\u3092\u7121\u8996\u3059\u308b\uff1a<\/strong>\u8aad\u307f\u8fbc\u307f\u304c\u66f8\u304d\u8fbc\u307f\u3092\u5727\u5012\u3059\u308b\u72b6\u6cc1\u3067\u306f\u3001\u30c7\u30ce\u30fc\u30de\u30e9\u30a4\u30ba\u306f\u6709\u52b9\u306a\u6226\u7565\u3067\u3059\u3002\u7e70\u308a\u8fd4\u3057\u30c7\u30fc\u30bf\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3053\u3068\u3067\u7d50\u5408\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u30c7\u30fc\u30bf\u3092\u540c\u671f\u3055\u305b\u308b\u4ed5\u7d44\u307f\u304c\u78ba\u4fdd\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u524d\u63d0\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>3. \u540d\u524d\u4ed8\u3051\u898f\u5247\u306e\u6df7\u4e71 \ud83c\udff7\ufe0f<\/h2>\n<p>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3001\u5c5e\u6027\u3001\u95a2\u4fc2\u306e\u540d\u524d\u4ed8\u3051\u306b\u304a\u3044\u3066\u4e00\u8cab\u6027\u304c\u3042\u308b\u3053\u3068\u306f\u3001\u4fdd\u5b88\u6027\u306b\u3068\u3063\u3066\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u4e00\u90e8\u306e\u30c6\u30fc\u30d6\u30eb\u3067snake_case\u3092\u4f7f\u7528\u3057\u3001\u4ed6\u306e\u30c6\u30fc\u30d6\u30eb\u3067CamelCase\u3092\u4f7f\u7528\u3059\u308b\u30b9\u30ad\u30fc\u30de\u306f\u3001\u958b\u767a\u8005\u3092\u6df7\u4e71\u3055\u305b\u3001\u30af\u30a8\u30ea\u4f5c\u6210\u6642\u306b\u69cb\u6587\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30b1\u30fc\u30b9\u306e\u4e0d\u7d71\u4e00\u4f7f\u7528\uff1a<\/strong>\u6df7\u5408\u3059\u308b <code>user_id<\/code> \u3068 <code>userId<\/code>\u540c\u3058\u30b9\u30ad\u30fc\u30de\u5185\u3067\u4f7f\u7528\u3059\u308b\u3068\u3001\u898f\u7d04\u306b\u4f9d\u5b58\u3059\u308b\u81ea\u52d5\u30b9\u30af\u30ea\u30d7\u30c8\u3084ORM\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30de\u30c3\u30d1\u30fc\uff09\u306e\u4f5c\u6210\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u8aac\u660e\u306e\u306a\u3044\u540d\u524d\uff1a<\/strong> \u4ee5\u4e0b\u306e\u3088\u3046\u306a\u540d\u524d\u3092\u4f7f\u7528\u3059\u308b <code>tbl_1<\/code> \u307e\u305f\u306f <code>field_a<\/code>\u610f\u5473\u306e\u3042\u308b\u610f\u5473\u3092\u4e00\u5207\u63d0\u4f9b\u3057\u306a\u3044\u3002\u5c06\u6765\u306e\u4fdd\u5b88\u62c5\u5f53\u8005\u306f\u3001\u5916\u90e8\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306a\u3057\u3067\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u76ee\u7684\u3092\u7406\u89e3\u3067\u304d\u306a\u304f\u306a\u308b\u3002<\/li>\n<li><strong>\u4e88\u7d04\u8a9e\uff1a<\/strong>\u5217\u306e\u540d\u524d\u3092\u4ed8\u3051\u308b\u969b\u306b\u306f<code>order<\/code> \u307e\u305f\u306f <code>group<\/code>SQL\u69cb\u6587\u3068\u7af6\u5408\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u3053\u308c\u3089\u306e\u540d\u524d\u306f\u30af\u30a8\u30ea\u5185\u3067\u7279\u5225\u306a\u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406\u304c\u5fc5\u8981\u3067\u3042\u308a\u3001SQL\u65b9\u8a00\u304c\u66f4\u65b0\u3055\u308c\u305f\u969b\u306b\u7834\u640d\u3057\u3084\u3059\u3044\u3002<\/li>\n<\/ul>\n<h3>\u547d\u540d\u898f\u5247\u306e\u7d71\u4e00<\/h3>\n<p>\u547d\u540d\u306b\u95a2\u3057\u3066\u53b3\u683c\u306a\u30dd\u30ea\u30b7\u30fc\u3092\u63a1\u7528\u3059\u308b\u3002\u30c6\u30fc\u30d6\u30eb\u306f\u8907\u6570\u5f62\u306e\u540d\u8a5e\u306b\u3059\u308b\uff08\u4f8b\uff1a<code>customers<\/code>\uff09\u3001\u5217\u306f\u30c7\u30fc\u30bf\u3092\u8aac\u660e\u3059\u308b\u5358\u6570\u5f62\u306e\u540d\u8a5e\u306b\u3059\u308b\uff08\u4f8b\uff1a<code>first_name<\/code>\uff09\u3002\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u306f\u3001<code>_id<\/code> \u307e\u305f\u306f <code>_pk<\/code>\u3068\u3044\u3046\u898f\u5247\u306b\u5f93\u3046\u3002\u5916\u90e8\u30ad\u30fc\u306f\u53c2\u7167\u3059\u308b\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u53cd\u6620\u3055\u305b\u308b\u3079\u304d\u3067\u3001\u4f8b\u3048\u3070<code>customer_id<\/code>.<\/p>\n<h2>4. \u6975\u6027\u306e\u8aa4\u89e3 \ud83d\udcc9<\/h2>\n<p>\u6975\u6027\u306f\u30012\u3064\u306e\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30ec\u30b3\u30fc\u30c9\u9593\u306e\u6570\u5024\u7684\u95a2\u4fc2\u3092\u5b9a\u7fa9\u3059\u308b\u3002\u3053\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3092\u8aa4\u89e3\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u6574\u5408\u6027\u306e\u4fb5\u5bb3\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30af\u30a8\u30ea\u306b\u304a\u3051\u308b\u8ad6\u7406\u30a8\u30e9\u30fc\u304c\u751f\u3058\u308b\u3002<\/p>\n<ul>\n<li><strong>1:1\u30921:N\u3068\u6df7\u540c\u3059\u308b\uff1a<\/strong>\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u304c\u8907\u6570\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u30011\u5bfe1\u306e\u95a2\u4fc2\u3092\u8a2d\u8a08\u3059\u308b\u3068\u3001\u4eba\u5de5\u7684\u306a\u5236\u9650\u304c\u751f\u3058\u308b\u3002\u305f\u3068\u3048\u3070\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30ae\u30e3\u30e9\u30ea\u30fc\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3067\u304d\u308b\u3079\u304d\u306a\u306e\u306b\u3001\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u753b\u50cf\u30921\u3064\u306b\u5236\u9650\u3057\u3066\u3057\u307e\u3046\u3002<\/li>\n<li><strong>\u30aa\u30d7\u30b7\u30e7\u30f3\u6027\u3092\u7121\u8996\u3059\u308b\uff1a<\/strong>\u95a2\u4fc2\u304c\u5fc5\u9808\u304b\u30aa\u30d7\u30b7\u30e7\u30f3\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u306f\u91cd\u8981\u3067\u3042\u308b\u3002\u30c6\u30fc\u30d6\u30eb\u304c\u5916\u90e8\u30ad\u30fc\u3092\u5fc5\u9808\u3068\u3059\u308b\u5834\u5408\u3001\u95a2\u4fc2\u306f\u5fc5\u9808\u3067\u3042\u308b\u3002\u5916\u90e8\u30ad\u30fc\u5217\u306bNULL\u5024\u3092\u8a31\u53ef\u3059\u308b\u5834\u5408\u3001\u95a2\u4fc2\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u3042\u308b\u3002\u3053\u308c\u3092\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u3057\u306a\u3044\u3068\u3001\u6709\u52b9\u306a\u53c2\u7167\u3092\u6301\u305f\u306a\u3044\u72b6\u614b\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u633f\u5165\u3057\u3088\u3046\u3068\u3059\u308b\u30d0\u30b0\u304c\u767a\u751f\u3059\u308b\u3002<\/li>\n<li><strong>\u65b9\u5411\u6027\u306e\u6df7\u4e71\uff1a<\/strong>\u95a2\u4fc2\u306f\u65b9\u5411\u6027\u3092\u6301\u3064\u3002A <code>\u30e6\u30fc\u30b6\u30fc<\/code>\u306f\u591a\u304f\u306e<code>\u6295\u7a3f\u3092\u6240\u6709\u3057\u3066\u3044\u307e\u3059<\/code>\u3001\u3057\u304b\u30571\u3064\u306e<code>\u6295\u7a3f<\/code>\u306f1\u3064\u306e<code>\u30e6\u30fc\u30b6\u30fc<\/code>\u3002\u30b9\u30ad\u30fc\u30de\u5185\u3067\u3053\u306e\u65b9\u5411\u3092\u53cd\u8ee2\u3055\u305b\u308b\u3068\u3001\u9023\u9396\u7684\u306a\u524a\u9664\u3084\u66f4\u65b0\u306e\u8ad6\u7406\u304c\u7834\u7dbb\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>5. \u30c7\u30fc\u30bf\u578b\u306e\u4e0d\u6574\u5408 \ud83d\udcca<\/h2>\n<p>\u30ab\u30e9\u30e0\u306b\u9069\u5207\u3067\u306a\u3044\u30c7\u30fc\u30bf\u578b\u3092\u9078\u629e\u3059\u308b\u3068\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u52b9\u7387\u3001\u30af\u30a8\u30ea\u901f\u5ea6\u3001\u30c7\u30fc\u30bf\u306e\u6b63\u78ba\u6027\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u521d\u671f\u8a2d\u8a08\u6bb5\u968e\u3067\u3057\u3070\u3057\u3070\u898b\u904e\u3054\u3055\u308c\u304c\u3061\u3067\u3059\u3002<\/p>\n<ul>\n<li><strong>\u56fa\u5b9a\u30c7\u30fc\u30bf\u306bVARCHAR\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\uff1a<\/strong>\u56fd\u30b3\u30fc\u30c9\u3084\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30e9\u30b0\u3092<code>VARCHAR<\/code>\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u683c\u7d0d\u3059\u308b\u3068\u30b9\u30c8\u30ec\u30fc\u30b8\u3092\u7121\u99c4\u306b\u4f7f\u3044\u3001\u6bd4\u8f03\u3092\u9045\u304f\u3057\u307e\u3059\u3002\u56fa\u5b9a\u5024\u306e\u96c6\u5408\u306b\u306f\u6574\u6570\u578b\u307e\u305f\u306f\u7279\u5b9a\u306e\u5217\u6319\u578b\u306e\u65b9\u304c\u52b9\u7387\u7684\u3067\u3059\u3002<\/li>\n<li><strong>\u6574\u6570\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u30ea\u30b9\u30af\uff1a<\/strong>\u6a19\u6e96\u306e<code>INT<\/code>\u309220\u5104\u3092\u8d85\u3048\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u91d1\u878d\u53d6\u5f15\u3084\u30e6\u30fc\u30b6\u30fcID\u306b\u4f7f\u7528\u3059\u308b\u3068\u3001\u9759\u304b\u306b\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<code>BIGINT<\/code>\u307e\u305f\u306f<code>DECIMAL<\/code>\u91d1\u984d\u5024\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306b\u4f34\u3046\u4e38\u3081\u8aa4\u5dee\u3092\u9632\u304e\u307e\u3059\u3002<\/li>\n<li><strong>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u306e\u7cbe\u5ea6\uff1a<\/strong>\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306e\u4fdd\u5b58\u3092\u8003\u616e\u305b\u305a\u306b<code>DATETIME<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u7570\u306a\u308b\u5730\u57df\u306e\u30e6\u30fc\u30b6\u30fc\u3092\u5bfe\u8c61\u306b\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092UTC\u3067\u4fdd\u5b58\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5c64\u3067\u5909\u63db\u3059\u308b\u65b9\u304c\u5b89\u5168\u306a\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>6. \u30ad\u30fc\u7ba1\u7406\u306e\u8aa4\u308a \ud83d\udd11<\/h2>\n<p>\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u3068\u5916\u90e8\u30ad\u30fc\u306f\u95a2\u4fc2\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u6574\u5408\u6027\u306e\u57fa\u76e4\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30ad\u30fc\u3092\u6b63\u3057\u304f\u5b9a\u7fa9\u3057\u306a\u3044\u3068\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5168\u4f53\u306e\u69cb\u9020\u304c\u640d\u306a\u308f\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30b7\u30f3\u30d7\u30eb\u3055\u306e\u305f\u3081\u306b\u8907\u5408\u30ad\u30fc\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\uff1a<\/strong> \u8907\u5408\u30ad\u30fc\u306f\u6b63\u5f53\u3067\u3059\u304c\u3001\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3068\u5916\u90e8\u30ad\u30fc\u95a2\u4fc2\u304c\u8907\u96d1\u306b\u306a\u308a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210\u304c\u96e3\u3057\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u30b5\u30ed\u30b2\u30fc\u30c8\u30ad\u30fc\uff08UUID\u3084\u81ea\u52d5\u5897\u5206\u6574\u6570\u306a\u3069\uff09\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u304c\u7c21\u6f54\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u304c\u6b20\u843d\u3057\u3066\u3044\u307e\u3059\uff1a<\/strong>\u5b50\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u3092\u7269\u7406\u7684\u5236\u7d04\u3092\u8ffd\u52a0\u305b\u305a\u306b\u5b9a\u7fa9\u3059\u308b\u3068\u3001\u5b64\u7acb\u3057\u305f\u30ec\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u53c2\u7167\u6574\u5408\u6027\u304c\u7834\u58ca\u3055\u308c\u3001\u30c7\u30fc\u30bf\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li><strong>\u9023\u9396\u524a\u9664\u306e\u30ea\u30b9\u30af\uff1a<\/strong>\u30d3\u30b8\u30cd\u30b9\u4e0a\u306e\u5f71\u97ff\u3092\u7406\u89e3\u305b\u305a\u306b\u9023\u9396\u524a\u9664\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u8aa4\u3063\u3066\u30c7\u30fc\u30bf\u3092\u5931\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u89aa\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3057\u3066\u3082\u3001\u3059\u3079\u3066\u306e\u95a2\u9023\u3059\u308b\u5b50\u30ec\u30b3\u30fc\u30c9\u3092\u524a\u9664\u3059\u308b\u3079\u304d\u3067\u306f\u306a\u3044\u5834\u5408\u304c\u591a\u304f\u3001\u7279\u306b\u305d\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u6b74\u53f2\u7684\u76e3\u67fb\u30c8\u30ec\u30fc\u30b9\u306e\u4e00\u90e8\u3067\u3042\u308b\u5834\u5408\u306b\u306f\u7279\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/li>\n<\/ul>\n<h2>\u4e00\u822c\u7684\u306a\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u7b56\u306e\u6bd4\u8f03<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u8aa4\u308a<\/th>\n<th>\u7d50\u679c<\/th>\n<th>\u662f\u6b63\u63aa\u7f6e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u591a\u5bfe\u591a\u306e\u76f4\u63a5\u30ea\u30f3\u30af<\/td>\n<td>\u95a2\u4fc2\u5c5e\u6027\u3092\u683c\u7d0d\u3067\u304d\u306a\u3044<\/td>\n<td>2\u3064\u306e\u5916\u90e8\u30ad\u30fc\u3092\u6301\u3064\u7d50\u5408\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u91cd\u8907\u3057\u305f\u30c7\u30fc\u30bf\u4fdd\u5b58<\/td>\n<td>\u66f4\u65b0\u7570\u5e38\u3068\u4e0d\u6574\u5408<\/td>\n<td>3NF\u306b\u6b63\u898f\u5316\u3057\u3001\u5916\u90e8\u30ad\u30fc\u3092\u4f7f\u7528\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u8aac\u660e\u306e\u306a\u3044\u5217\u540d<\/td>\n<td>\u9ad8\u3044\u4fdd\u5b88\u30b3\u30b9\u30c8\u3068\u6df7\u4e71<\/td>\n<td>\u53b3\u683c\u306a\u547d\u540d\u898f\u5247\u3092\u5c0e\u5165\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u5916\u90e8\u30ad\u30fc\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6b20\u843d\u3057\u3066\u3044\u308b<\/td>\n<td>\u7d50\u5408\u51e6\u7406\u306e\u9045\u5ef6<\/td>\n<td>\u3059\u3079\u3066\u306e\u5916\u90e8\u30ad\u30fc\u5217\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308b<\/td>\n<\/tr>\n<tr>\n<td>\u8aa4\u3063\u305f\u30c7\u30fc\u30bf\u578b<\/td>\n<td>\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u81a8\u5f35\u307e\u305f\u306f\u8a08\u7b97\u30a8\u30e9\u30fc<\/td>\n<td>\u30c7\u30fc\u30bf\u306e\u7279\u6027\u306b\u5fdc\u3058\u3066\u578b\u3092\u4e00\u81f4\u3055\u305b\u308b\uff08\u4f8b\uff1aINT vs VARCHAR\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>7. \u5b9f\u88c5\u524d\u30ec\u30d3\u30e5\u30fc\u78ba\u8a8d\u30ea\u30b9\u30c8 \u2705<\/h2>\n<p>\u30b9\u30ad\u30fc\u30de\u3092\u30c7\u30d7\u30ed\u30a4\u3059\u308b\u524d\u306b\u3001\u8a2d\u8a08\u4e0a\u306e\u6b20\u9665\u3092\u767a\u898b\u3059\u308b\u305f\u3081\u306b\u53b3\u5bc6\u306a\u30ec\u30d3\u30e5\u30fc\u3092\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u306f\u4e0a\u8a18\u3067\u7279\u5b9a\u3055\u308c\u305f\u91cd\u8981\u306a\u9818\u57df\u3092\u30ab\u30d0\u30fc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u540d\u306e\u78ba\u8a8d\uff1a<\/strong>\u3059\u3079\u3066\u306e\u30c6\u30fc\u30d6\u30eb\u304c\u4e00\u8cab\u3057\u305f\u540d\u524d\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\u305d\u308c\u305e\u308c\u304c\u660e\u78ba\u306a\u6982\u5ff5\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n<li><strong>\u57fa\u6570\u306e\u78ba\u8a8d\uff1a<\/strong>\u3059\u3079\u3066\u306e\u95a2\u4fc2\u304c\u30d3\u30b8\u30cd\u30b9\u30eb\u30fc\u30eb\u3092\u6b63\u78ba\u306b\u53cd\u6620\u3057\u3066\u3044\u307e\u3059\u304b\uff1f\u6700\u5c0f\u304a\u3088\u3073\u6700\u5927\u53c2\u52a0\u6570\u304c\u660e\u78ba\u3067\u3059\u304b\uff1f<\/li>\n<li><strong>\u30ad\u30fc\u306e\u691c\u8a3c\uff1a<\/strong>\u5404\u884c\u306b\u4e00\u610f\u306e\u8b58\u5225\u5b50\u304c\u3042\u308a\u307e\u3059\u304b\uff1f\u3059\u3079\u3066\u306e\u95a2\u4fc2\u306b\u5916\u90e8\u30ad\u30fc\u304c\u5b58\u5728\u3057\u307e\u3059\u304b\uff1f<\/li>\n<li><strong>\u30c7\u30fc\u30bf\u578b\u306e\u78ba\u8a8d\uff1a<\/strong>\u5217\u306e\u30c7\u30fc\u30bf\u578b\u306f\u3001\u60f3\u5b9a\u3055\u308c\u308b\u30c7\u30fc\u30bf\u306e\u7bc4\u56f2\u3068\u7cbe\u5ea6\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n<li><strong>\u6b63\u898f\u5316\u306e\u8a55\u4fa1\uff1a<\/strong>\u30b9\u30ad\u30fc\u30de\u306f\u5197\u9577\u6027\u3068\u7d50\u5408\u306e\u8907\u96d1\u3055\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u53d6\u308c\u3066\u3044\u307e\u3059\u304b\uff1f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n<li><strong>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u78ba\u8a8d\uff1a<\/strong>\u6a5f\u5bc6\u6027\u306e\u9ad8\u3044\u5217\u306f\u9069\u5207\u306b\u30de\u30fc\u30af\u3055\u308c\u3066\u3044\u307e\u3059\u304b\uff1f\u30c7\u30fc\u30bf\u3092\u9759\u6b62\u72b6\u614b\u3067\u6697\u53f7\u5316\u3059\u308b\u8a08\u753b\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/li>\n<li><strong>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\uff1a<\/strong>\u30b9\u30ad\u30fc\u30de\u306f\u30c7\u30fc\u30bf\u91cf\u306e\u4e88\u60f3\u3055\u308c\u308b\u5897\u52a0\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u304b\uff1f\u5927\u898f\u6a21\u306a\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3066\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0\u6226\u7565\u306f\u691c\u8a0e\u3055\u308c\u3066\u3044\u307e\u3059\u304b\uff1f<\/li>\n<\/ul>\n<h2>8. \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u3068\u9032\u5316 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