{"id":1622,"date":"2026-03-25T10:09:13","date_gmt":"2026-03-25T10:09:13","guid":{"rendered":"https:\/\/www.ez-knowledge.com\/ja\/eliminating-circular-dependencies-erd\/"},"modified":"2026-03-25T10:09:13","modified_gmt":"2026-03-25T10:09:13","slug":"eliminating-circular-dependencies-erd","status":"publish","type":"post","link":"https:\/\/www.ez-knowledge.com\/ja\/eliminating-circular-dependencies-erd\/","title":{"rendered":"\u8907\u96d1\u306aER\u56f3\u306b\u304a\u3051\u308b\u5faa\u74b0\u4f9d\u5b58\u306e\u89e3\u6d88"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Child-style hand-drawn infographic explaining circular dependencies in database ER diagrams, showing colorful table boxes connected by looping arrows, warning signs for data integrity and performance issues, and playful solution illustrations including puzzle pieces for normalization, bridge-shaped junction tables, magical window views, and dotted-line soft references, with 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\u2192 B \u2192 C \u2192 A\u3002\u3053\u308c\u3089\u306f\u8907\u96d1\u306a\u30b9\u30ad\u30fc\u30de\u3067\u306f\u8996\u899a\u7684\u306b\u767a\u898b\u3057\u306b\u304f\u3044\u3002<\/li>\n<li><strong>\u81ea\u5df1\u53c2\u7167\u30eb\u30fc\u30d7\uff1a<\/strong>\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u81ea\u5206\u81ea\u8eab\u3092\u53c2\u7167\u3059\u308b\u3002\u968e\u5c64\u30c7\u30fc\u30bf\uff08\u4f8b\uff1a\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u3082\u5f93\u696d\u54e1\u3067\u3042\u308b\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\uff09\u3067\u306f\u4e00\u822c\u7684\u3060\u304c\u3001\u4e0d\u9069\u5207\u306a\u5b9f\u88c5\u306f\u7121\u9650\u518d\u5e30\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<h2>\u26a0\ufe0f 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\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u306e\u5c0e\u5165<\/h3>\n<p>\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u306f\u3001\u5faa\u74b0\u30eb\u30fc\u30d7\u306e\u983b\u51fa\u539f\u56e0\u3067\u3059\u3002\u4e3b\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u5916\u90e8\u30ad\u30fc\u3092\u76f4\u63a5\u914d\u7f6e\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e2d\u9593\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u3082\u3057<code>\u751f\u5f92<\/code>\u3068<code>\u6388\u696d<\/code>\u306e\u9593\u306b\u591a\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u3042\u308b\u5834\u5408\u3001<code>\u6388\u696dID<\/code>\u3092<code>\u751f\u5f92<\/code>\u30c6\u30fc\u30d6\u30eb\u306b\u8ffd\u52a0\u3057\u3001<code>\u751f\u5f92ID<\/code>\u3092<code>\u6388\u696d<\/code>\u30c6\u30fc\u30d6\u30eb\u306b\u8ffd\u52a0\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u4ee3\u308f\u308a\u306b\u3001\u4e21\u65b9\u306eID\u3092\u4fdd\u6301\u3059\u308b<code>\u767b\u9332<\/code>\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u30012\u3064\u306e\u4e3b\u8981\u306a\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u9593\u306e\u76f4\u63a5\u7684\u306a\u30ea\u30f3\u30af\u304c\u65ad\u305f\u308c\u307e\u3059\u3002<\/p>\n<h3>3. \u8ad6\u7406\u95a2\u4fc2\u306b\u30d3\u30e5\u30fc\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n<p>\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u7269\u7406\u7684\u306a\u683c\u7d0d\u65b9\u6cd5\u304c\u8ad6\u7406\u7684\u306a\u8981\u4ef6\u3092\u5b8c\u5168\u306b\u53cd\u6620\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304cA\u3068B\u306e\u9593\u306b\u95a2\u4fc2\u3092\u8a8d\u8b58\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304c\u3001\u76f4\u63a5\u683c\u7d0d\u3059\u308b\u3068\u30eb\u30fc\u30d7\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30d3\u30e5\u30fc\u3092\u4f7f\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li><strong>\u7269\u7406\u30e2\u30c7\u30eb\uff1a<\/strong>A\u3068B\u3092\u3001\u76f4\u63a5\u306e\u5916\u90e8\u30ad\u30fc\u306e\u30ea\u30f3\u30af\u306a\u3057\u3067\u683c\u7d0d\u3059\u308b\u3002<\/li>\n<li><strong>\u8ad6\u7406\u30e2\u30c7\u30eb\uff1a<\/strong>\u5171\u901a\u306e\u5c5e\u6027\u307e\u305f\u306f\u5225\u500b\u306e\u95a2\u4fc2\u30c6\u30fc\u30d6\u30eb\u306b\u57fa\u3065\u3044\u3066\u3001A\u3068B\u3092\u7d50\u5408\u3059\u308b\u30d3\u30e5\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u5236\u7d04\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u8ad6\u7406\u304b\u3089\u5206\u96e2\u3055\u308c\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u7269\u7406\u7684\u306a\u30eb\u30fc\u30d7\u3092\u4f5c\u6210\u305b\u305a\u306b\u3001\u91cd\u8981\u3068\u306a\u308b\u5834\u6240\u3067\u6574\u5408\u6027\u3092\u7dad\u6301\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>4. \u30bd\u30d5\u30c8\u53c2\u7167\u306e\u5b9f\u88c5<\/h3>\n<p>\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u95a2\u4fc2\u306b\u5bfe\u3057\u3066\u53b3\u683c\u306a\u53c2\u7167\u6574\u5408\u6027\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002\u95a2\u9023\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306eID\u3092\u5916\u90e8\u30ad\u30fc\u5236\u7d04\u3067\u306f\u306a\u304f\u3001\u5358\u7d14\u306a\u6574\u6570\u5217\u3068\u3057\u3066\u4fdd\u5b58\u3067\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>\u9577\u6240\uff1a<\/strong>\u633f\u5165\u30fb\u524a\u9664\u6642\u306b\u5236\u7d04\u30c1\u30a7\u30c3\u30af\u304c\u524a\u9664\u3055\u308c\u3001\u30eb\u30fc\u30d7\u304c\u7269\u7406\u7684\u306b\u5b58\u5728\u3057\u3066\u3082\u64cd\u4f5c\u3092\u30d6\u30ed\u30c3\u30af\u3057\u306a\u304f\u306a\u308b\u3002<\/li>\n<li><strong>\u77ed\u6240\uff1a<\/strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3082\u306f\u3084\u95a2\u4fc2\u3092\u5f37\u5236\u3057\u306a\u304f\u306a\u308b\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u304c\u53c2\u7167\u3055\u308c\u308bID\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u691c\u8a3c\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcca \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5\u306e\u6bd4\u8f03<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u624b\u6cd5<\/th>\n<th>\u8907\u96d1\u3055<\/th>\n<th>\u6574\u5408\u6027\u306e\u5f37\u5236<\/th>\n<th>\u6700\u9069\u306a\u4f7f\u7528\u30b1\u30fc\u30b9<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6b63\u898f\u5316<\/td>\n<td>\u9ad8<\/td>\n<td>\u5b8c\u5168<\/td>\n<td>\u30c7\u30fc\u30bf\u306e\u91cd\u8907\u304c\u6839\u672c\u539f\u56e0\u306e\u5834\u5408\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u7d50\u5408\u30c6\u30fc\u30d6\u30eb<\/td>\n<td>\u4e2d<\/td>\n<td>\u5b8c\u5168<\/td>\n<td>\u591a\u5bfe\u591a\u95a2\u4fc2\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30d3\u30e5\u30fc<\/td>\n<td>\u4f4e<\/td>\n<td>\u90e8\u5206\u7684\uff08\u30af\u30a8\u30ea\u30ec\u30d9\u30eb\uff09<\/td>\n<td>\u30ec\u30dd\u30fc\u30c8\u4f5c\u6210\u3084\u8aad\u307f\u53d6\u308a\u4e2d\u5fc3\u306e\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u3002<\/td>\n<\/tr>\n<tr>\n<td>\u30bd\u30d5\u30c8\u53c2\u7167<\/td>\n<td>\u4f4e<\/td>\n<td>\u306a\u3057\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ec\u30d9\u30eb\uff09<\/td>\n<td>\u30ec\u30ac\u30b7\u30fc\u30b7\u30b9\u30c6\u30e0\u3084\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u95a2\u4fc2\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\ud83d\udee1\ufe0f \u9632\u6b62\u7b56\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<p>\u30b9\u30ad\u30fc\u30de\u3092\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3057\u305f\u3089\u3001\u4eca\u5f8c\u306e\u30eb\u30fc\u30d7\u306e\u767a\u751f\u3092\u9632\u3050\u3053\u3068\u306b\u7126\u70b9\u304c\u79fb\u308b\u3002\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3084\u30ac\u30d0\u30ca\u30f3\u30b9\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308a\u3001\u3053\u308c\u3089\u306e\u554f\u984c\u304c\u518d\u767a\u3059\u308b\u30ea\u30b9\u30af\u3092\u8efd\u6e1b\u3067\u304d\u308b\u3002<\/p>\n<h3>1. \u95a2\u4fc2\u306e\u65b9\u5411\u3092\u5b9a\u7fa9\u3059\u308b<\/h3>\n<p>\u5916\u90e8\u30ad\u30fc\u306f\u5e38\u306b\u7279\u5b9a\u306e\u65b9\u5411\u306b\u306e\u307f\u6d41\u308c\u308b\u3053\u3068\u3092\u30eb\u30fc\u30eb\u3068\u3057\u3066\u5b9a\u3081\u308b\u3002\u4f8b\u3048\u3070\u3001\u5b50\u30c6\u30fc\u30d6\u30eb\u306f\u5e38\u306b\u89aa\u3092\u53c2\u7167\u3059\u308b\u304c\u3001\u9006\u306f\u3057\u306a\u3044\u3002\u89aa\u304c\u5b50\u306e\u30c7\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u5916\u90e8\u30ad\u30fc\u3067\u306f\u306a\u304f\u30af\u30a8\u30ea\u307e\u305f\u306f\u30d3\u30e5\u30fc\u3092\u4f7f\u7528\u3059\u308b\u3002<\/p>\n<h3>2. \u30cf\u30a4\u30a8\u30e9\u30eb\u30ad\u30fc\u3092\u614e\u91cd\u306b\u30e2\u30c7\u30eb\u5316\u3059\u308b<\/h3>\n<p>\u81ea\u5df1\u53c2\u7167\u30c6\u30fc\u30d6\u30eb\u306f\u7d44\u7e54\u56f3\u3084\u30b3\u30e1\u30f3\u30c8\u30b9\u30ec\u30c3\u30c9\u306a\u3069\u3067\u4e00\u822c\u7684\u3067\u3042\u308b\u3002\u30eb\u30fc\u30d7\u3092\u9632\u3050\u305f\u3081\u306b\uff1a<\/p>\n<ul>\n<li><strong>\u89aa\u306e\u307f\uff1a<\/strong> \u4ee5\u4e0b\u306e\u9805\u76ee\u306e\u307f\u3092\u4fdd\u5b58\u3059\u308b\uff1a<code>parent_id<\/code>\u3002\u4ee5\u4e0b\u306e\u9805\u76ee\u306f\u540c\u3058\u884c\u306b\u4fdd\u5b58\u3057\u306a\u3044\uff1a<code>children_ids<\/code>\u540c\u3058\u884c\u306b\u4fdd\u5b58\u3057\u306a\u3044\u3002<\/li>\n<li><strong>\u30d1\u30b9\u5217\u6319\uff1a<\/strong> \u6df1\u3044\u968e\u5c64\u69cb\u9020\u306e\u5834\u5408\u3001\u30d5\u30eb\u30d1\u30b9\u6587\u5b57\u5217\uff08\u4f8b\uff1a<code>\/1\/5\/9\/<\/code>\uff09\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u3067\u3001\u518d\u5e30\u7684\u7d50\u5408\u306a\u3057\u306b\u9ad8\u901f\u306a\u30af\u30a8\u30ea\u304c\u53ef\u80fd\u306b\u306a\u308b\u3002<\/li>\n<\/ul>\n<h3>3. \u30b9\u30ad\u30fc\u30de\u306e\u81ea\u52d5\u76e3\u67fb<\/h3>\n<p>\u30b5\u30a4\u30af\u30eb\u691c\u51fa\u3092CI\/CD\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u306b\u7d71\u5408\u3059\u308b\u3002\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u30b9\u30ad\u30fc\u30de\u5b9a\u7fa9\u30d5\u30a1\u30a4\u30eb\uff08SQL\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u30b9\u30af\u30ea\u30d7\u30c8\u306a\u3069\uff09\u3092\u89e3\u6790\u3057\u3001\u30c7\u30d7\u30ed\u30a4\u524d\u306b\u30eb\u30fc\u30d7\u3092\u751f\u3058\u3055\u305b\u308b\u65b0\u3057\u3044\u5916\u90e8\u30ad\u30fc\u5b9a\u7fa9\u3092\u8b66\u544a\u3067\u304d\u308b\u3002<\/p>\n<h3>4. 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