{"id":68,"date":"2026-04-05T18:03:13","date_gmt":"2026-04-05T18:03:13","guid":{"rendered":"https:\/\/www.we-notes.com\/cn\/er-diagram-relations-keys-cardinality-guide\/"},"modified":"2026-04-05T18:03:13","modified_gmt":"2026-04-05T18:03:13","slug":"er-diagram-relations-keys-cardinality-guide","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/cn\/er-diagram-relations-keys-cardinality-guide\/","title":{"rendered":"\u95ee\u7b54\uff1a\u89e3\u51b3ER\u56fe\u4e2d\u5173\u4e8e\u5173\u7cfb\u3001\u952e\u548c\u57fa\u6570\u768415\u4e2a\u5e38\u89c1\u56f0\u60d1"},"content":{"rendered":"<p>\u5b9e\u4f53\u5173\u7cfb\u56fe\uff08ERD\uff09\u662f\u6570\u636e\u5e93\u67b6\u6784\u7684\u84dd\u56fe\u3002\u7136\u800c\uff0c\u5373\u4f7f\u7ecf\u9a8c\u4e30\u5bcc\u7684\u8bbe\u8ba1\u5e08\u5728\u5c06\u4e1a\u52a1\u903b\u8f91\u8f6c\u5316\u4e3a\u6570\u636e\u6a21\u578b\u65f6\u4e5f\u4f1a\u9047\u5230\u56f0\u96be\u3002\u8fd9\u79cd\u6a21\u7cca\u6027\u901a\u5e38\u6e90\u4e8e\u672f\u8bed\u91cd\u53e0\u4ee5\u53ca\u7ed3\u6784\u5143\u7d20\u4e4b\u95f4\u7684\u7ec6\u5fae\u5dee\u522b\u3002\u672c\u6307\u5357\u89e3\u51b3\u4e86\u5173\u4e8e\u952e\u3001\u57fa\u6570\u548c\u5173\u7cfb\u7684\u6700\u5e38\u89c1\u95ee\u9898\u3002<\/p>\n<p>\u7406\u89e3\u8fd9\u4e9b\u6982\u5ff5\u53ef\u4ee5\u9632\u6b62\u6570\u636e\u5197\u4f59\u5e76\u786e\u4fdd\u67e5\u8be2\u6027\u80fd\u3002\u6211\u4eec\u5c06\u9010\u4e00\u5206\u679015\u4e2a\u5177\u4f53\u7684\u56f0\u60d1\u70b9\uff0c\u5c06\u5176\u5206\u89e3\u4e3a\u6e05\u6670\u4e14\u53ef\u64cd\u4f5c\u7684\u5b9a\u4e49\u3002\u6bcf\u4e2a\u90e8\u5206\u90fd\u5305\u542b\u5b9e\u9645\u793a\u4f8b\u548c\u89c6\u89c9\u63cf\u8ff0\uff0c\u4ee5\u9610\u660e\u5176\u5e95\u5c42\u673a\u5236\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Chalkboard-style educational infographic explaining 15 key ER diagram concepts including entities, attributes, primary keys, foreign keys, one-to-one, one-to-many, many-to-many relationships, cardinality, modality, weak entities, composite keys, normalization, and notation styles, designed with hand-written teacher aesthetic for database design learning\" decoding=\"async\" src=\"https:\/\/www.we-notes.com\/wp-content\/uploads\/2026\/04\/er-diagram-15-concepts-chalkboard-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>1. \u5b9e\u4f53\u548c\u5c5e\u6027\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f \ud83c\udff7\ufe0f<\/h2>\n<p>\u4e00\u4e2a<strong>\u5b9e\u4f53<\/strong>\u8868\u793a\u4e00\u4e2a\u5173\u4e8e\u6570\u636e\u5b58\u50a8\u7684\u73b0\u5b9e\u4e16\u754c\u5bf9\u8c61\u6216\u6982\u5ff5\u3002\u901a\u5e38\u7528\u77e9\u5f62\u8868\u793a\u3002\u4f8b\u5982<em>\u5ba2\u6237<\/em>, <em>\u4ea7\u54c1<\/em>\uff0c\u6216<em>\u8ba2\u5355<\/em>.<\/p>\n<p>\u4e00\u4e2a<strong>\u5c5e\u6027<\/strong>\u63cf\u8ff0\u5b9e\u4f53\u7684\u4e00\u4e2a\u5c5e\u6027\u3002\u901a\u5e38\u7528\u4e0e\u5b9e\u4f53\u76f8\u8fde\u7684\u692d\u5706\u8868\u793a\u3002\u4f8b\u5982\uff0c<em>\u5ba2\u6237\u59d3\u540d<\/em>\u6216<em>\u4ea7\u54c1\u4ef7\u683c<\/em>\u90fd\u662f\u4e0a\u8ff0\u5b9e\u4f53\u7684\u5c5e\u6027\u3002<\/p>\n<ul>\n<li><strong>\u5b9e\u4f53\uff1a<\/strong> \u540d\u8bcd\uff08\u8c01\/\u4ec0\u4e48\uff09\u3002<\/li>\n<li><strong> \u5c5e\u6027\uff1a<\/strong> \u5f62\u5bb9\u8bcd\uff08\u63cf\u8ff0\u5b83\u7684\u5185\u5bb9\uff09\u3002<\/li>\n<\/ul>\n<p>\u5f53\u4e00\u4e2a\u5c5e\u6027\u5305\u542b\u591a\u4e2a\u4fe1\u606f\u9879\u65f6\uff0c\u5e38\u5e38\u4f1a\u4ea7\u751f\u6df7\u6dc6\u3002\u5982\u679c<em>\u5730\u5740<\/em>\u662f\u4e00\u4e2a\u5c5e\u6027\uff0c\u90a3\u4e48\u5c06\u5176\u62c6\u5206\u4e3a<em>\u8857\u9053<\/em>, <em>\u57ce\u5e02<\/em>\uff0c\u4ee5\u53ca<em>\u90ae\u7f16<\/em>\u4ee5\u5b9e\u73b0\u66f4\u597d\u7684\u89c4\u8303\u5316\u3002<\/p>\n<h2>2. \u4e3b\u952e\u548c\u552f\u4e00\u952e\u6709\u4ec0\u4e48\u533a\u522b\uff1f \ud83d\udd11<\/h2>\n<p>\u4e24\u8005\u90fd\u80fd\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\uff0c\u4f46\u5b83\u4eec\u7684\u4f7f\u7528\u65b9\u5f0f\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<ul>\n<li><strong>\u4e3b\u952e\uff1a<\/strong> \u552f\u4e00\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u3002\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002\u5b83\u4e0d\u80fd\u5305\u542b\u7a7a\u503c\u3002<\/li>\n<li><strong>\u552f\u4e00\u952e\uff1a<\/strong> \u786e\u4fdd\u5217\u4e2d\u7684\u6240\u6709\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u4e00\u4e2a\u8868\u53ef\u4ee5\u6709\u591a\u4e2a\u552f\u4e00\u952e\u3002\u7a7a\u503c\u901a\u5e38\u88ab\u5141\u8bb8\uff08\u53d6\u51b3\u4e8e\u5177\u4f53\u5b9e\u73b0\uff09\u3002<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u628a\u4e3b\u952e\u60f3\u8c61\u6210\u8bb0\u5f55\u7684\u793e\u4fdd\u53f7\u7801\u3002\u552f\u4e00\u952e\u5219\u50cf\u62a4\u7167\u53f7\u7801\u2014\u2014\u540c\u6837\u662f\u552f\u4e00\u7684\uff0c\u4f46\u4e00\u4e2a\u4eba\u53ef\u80fd\u6709\u591a\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u3002<\/p>\n<h2>3. \u4ec0\u4e48\u662f\u5916\u952e\uff0c\u5b83\u662f\u5982\u4f55\u8fde\u63a5\u8868\u7684\uff1f \ud83d\udd17<\/h2>\n<p>\u4e00\u4e2a<strong>\u5916\u952e<\/strong> \u662f\u4e00\u4e2a\u8868\u4e2d\u7684\u5b57\u6bb5\uff08\u6216\u5b57\u6bb5\u96c6\u5408\uff09\uff0c\u5b83\u5f15\u7528\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u3002\u5b83\u5728\u4e24\u4e2a\u8868\u4e4b\u95f4\u5efa\u7acb\u8054\u7cfb\u3002<\/p>\n<p>\u8003\u8651\u4e00\u4e2a<em>\u8ba2\u5355<\/em>\u8868\u3002\u5b83\u9700\u8981\u77e5\u9053\u662f\u54ea\u4e2a<em>\u5ba2\u6237<\/em>\u4e0b\u7684\u8ba2\u5355\u3002<em>\u5ba2\u6237ID<\/em>\u5728<em>\u8ba2\u5355<\/em>\u8868\u4e2d\u5c31\u662f\u5916\u952e\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u8868<\/th>\n<th>\u5217<\/th>\n<th>\u89d2\u8272<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5ba2\u6237<\/td>\n<td>\u5ba2\u6237ID<\/td>\n<td>\u4e3b\u952e<\/td>\n<\/tr>\n<tr>\n<td>\u8ba2\u5355<\/td>\n<td>\u5ba2\u6237ID<\/td>\n<td>\u5916\u952e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u79cd\u5173\u7cfb\u4f7f\u6570\u636e\u5e93\u80fd\u591f\u5f3a\u5236\u5b9e\u65bd\u5f15\u7528\u5b8c\u6574\u6027\uff0c\u786e\u4fdd\u4e0d\u5b58\u5728\u6ca1\u6709\u6709\u6548\u5ba2\u6237\u7684\u8ba2\u5355\u3002<\/p>\n<h2>4. \u4ec0\u4e48\u65f6\u5019\u662f\u4e00\u5bf9\u4e00\u5173\u7cfb\uff1f \ud83e\udd1d<\/h2>\n<p>\u4e00\u5bf9\u4e00\uff081:1\uff09\u5173\u7cfb\u53d1\u751f\u5728\u8868A\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u6070\u597d\u4e0e\u8868B\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u76f8\u5173\u8054\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n<ul>\n<li><strong>\u793a\u4f8b\uff1a<\/strong> \u4e00\u4e2a <em>\u4eba\u5458<\/em> \u548c\u4e00\u4e2a <em>\u62a4\u7167<\/em>.<\/li>\n<li><strong>\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/strong>\u901a\u5e38\u901a\u8fc7\u5c06\u4e00\u4e2a\u8868\u7684\u4e3b\u952e\u4f5c\u4e3a\u53e6\u4e00\u4e2a\u8868\u7684\u5916\u952e\u6765\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<p>\u5f53\u4e3a\u4e86\u4f18\u5316\u6027\u80fd\u6216\u5b89\u5168\u6027\u800c\u62c6\u5206\u5b9e\u4f53\u65f6\uff0c\u8fd9\u79cd\u60c5\u51b5\u5f88\u5e38\u89c1\u3002\u4f8b\u5982\uff0c\u5c06\u50cf <em>\u793e\u4f1a\u4fdd\u969c\u53f7\u7801<\/em> \u8fd9\u6837\u7684\u654f\u611f\u6570\u636e\u79fb\u52a8\u5230\u4e00\u4e2a\u5355\u72ec\u7684\u3001\u4e00\u5bf9\u4e00\u5173\u8054\u7684\u8868\u4e2d\u3002<\/p>\n<h2>5. \u4e00\u5bf9\u591a\u5173\u7cfb\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f \ud83d\udce6<\/h2>\n<p>\u8fd9\u662f\u6700\u5e38\u89c1\u7684\u5173\u7cfb\u7c7b\u578b\u3002\u8868A\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u4e0e\u8868B\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\u76f8\u5173\u8054\uff0c\u4f46\u8868B\u4e2d\u7684\u8bb0\u5f55\u4ec5\u4e0e\u8868A\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u76f8\u5173\u8054\u3002<\/p>\n<ul>\n<li><strong>\u793a\u4f8b\uff1a<\/strong> <em>\u90e8\u95e8<\/em> \u5230 <em>\u5458\u5de5<\/em>.<\/li>\n<li><strong>\u65b9\u5411\uff1a<\/strong>\u4e00\u4e2a\u90e8\u95e8\u6709\u591a\u4e2a\u5458\u5de5\u3002<\/li>\n<\/ul>\n<p>\u5728ERD\u4e2d\uff0c\u8fd9\u901a\u8fc7\u8fde\u63a5\u4e24\u4e2a\u5b9e\u4f53\u7684\u7ebf\u6765\u8868\u793a\u3002\u5e26\u6709\u201c\u591a\u201d\u7684\u4e00\u4fa7\u63a5\u6536\u5916\u952e\u3002<\/p>\n<h2>6. \u4e3a\u4ec0\u4e48\u591a\u5bf9\u591a\u5173\u7cfb\u5177\u6709\u95ee\u9898\uff1f \u2696\ufe0f<\/h2>\n<p>\u5f53\u8868A\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\u4e0e\u8868B\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\u76f8\u5173\u8054\u65f6\uff0c\u5c31\u5b58\u5728\u591a\u5bf9\u591a\uff08M:N\uff09\u5173\u7cfb\u3002\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u82e5\u6ca1\u6709\u4e2d\u95f4\u8868\uff0c\u65e0\u6cd5\u76f4\u63a5\u5b9e\u73b0\u8fd9\u79cd\u5173\u7cfb\u3002<\/p>\n<ul>\n<li><strong>\u95ee\u9898\uff1a<\/strong>\u4f60\u4e0d\u80fd\u7b80\u5355\u5730\u5411\u4e00\u4e2a\u8868\u6dfb\u52a0\u5916\u952e\uff0c\u56e0\u4e3a\u4e00\u884c\u9700\u8981\u5b58\u50a8\u591a\u4e2aID\u3002<\/li>\n<li><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong> \u521b\u5efa\u4e00\u4e2a\u8fde\u63a5\u8868\uff08\u5173\u8054\u5b9e\u4f53\uff09\u3002<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e <em>\u5b66\u751f<\/em> \u548c <em>\u8bfe\u7a0b<\/em>\uff0c\u521b\u5efa\u4e00\u4e2a <em>\u6ce8\u518c<\/em> \u8868\uff0c\u5305\u542b <em>\u5b66\u751fID<\/em> \u548c <em>\u8bfe\u7a0bID<\/em>\u3002\u8fd9\u5c06\u591a\u5bf9\u591a\u5173\u7cfb\u8f6c\u6362\u4e3a\u4e24\u4e2a\u4e00\u5bf9\u591a\u5173\u7cfb\u3002<\/p>\n<h2>7. \u4ec0\u4e48\u662f\u57fa\u6570\u548c\u6a21\u6001\u7684\u533a\u522b\uff1f\u2696\ufe0f<\/h2>\n<p>\u8fd9\u4e9b\u672f\u8bed\u63cf\u8ff0\u4e86\u5173\u7cfb\u7684\u7ea6\u675f\uff0c\u7531\u4e8e\u7b26\u53f7\u76f8\u4f3c\uff0c\u5e38\u5e38\u88ab\u6df7\u6dc6\u3002<\/p>\n<ul>\n<li><strong>\u57fa\u6570\uff1a<\/strong> \u5b9e\u4f8b\u7684\u6700\u5927\u6570\u91cf\u3002\uff08\u4f8b\u5982\uff0c\u4e00\u5bf9\u591a\uff09\u3002<\/li>\n<li><strong>\u6a21\u6001\uff1a<\/strong> \u5b9e\u4f8b\u7684\u6700\u5c0f\u6570\u91cf\u3002\uff08\u4f8b\u5982\uff0c\u5f3a\u5236\u6216\u53ef\u9009\uff09\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b\uff1a\u4e00\u4e2a <em>\u5458\u5de5<\/em> \u5fc5\u987b\u6709\u4e00\u4e2a <em>\u90e8\u95e8<\/em>\uff08\u6a21\u6001\uff1a\u5f3a\u5236\/1\uff09\u3002\u4e00\u4e2a <em>\u90e8\u95e8<\/em> \u53ef\u4ee5\u5728\u6ca1\u6709 <em>\u5458\u5de5<\/em> \u7684\u60c5\u51b5\u4e0b\u5b58\u5728\uff08\u6a21\u6001\uff1a\u53ef\u9009\/0\uff09\u3002<\/p>\n<h2>8. \u6807\u8bc6\u6027\u5173\u7cfb\u4e0e\u975e\u6807\u8bc6\u6027\u5173\u7cfb \ud83e\udde9<\/h2>\n<p>\u4e24\u8005\u7684\u533a\u522b\u5728\u4e8e\u5b50\u5b9e\u4f53\u7684\u4f9d\u8d56\u6027\u3002<\/p>\n<ul>\n<li><strong>\u6807\u8bc6\u6027\uff1a<\/strong> \u5b50\u5b9e\u4f53\u4e0d\u80fd\u8131\u79bb\u7236\u5b9e\u4f53\u800c\u5b58\u5728\u3002\u5916\u952e\u662f\u5b50\u5b9e\u4f53\u4e3b\u952e\u7684\u4e00\u90e8\u5206\u3002\u901a\u5e38\u7528\u5b9e\u7ebf\u8868\u793a\u3002<\/li>\n<li><strong>\u975e\u6807\u8bc6\u6027\uff1a<\/strong> \u5b50\u5b9e\u4f53\u53ef\u4ee5\u72ec\u7acb\u5b58\u5728\u3002\u5916\u952e\u4e0d\u662f\u4e3b\u952e\u7684\u4e00\u90e8\u5206\u3002\u901a\u5e38\u7528\u865a\u7ebf\u8868\u793a\u3002<\/li>\n<\/ul>\n<p>\u8003\u8651\u4e00\u4e2a<em>\u53d1\u7968<\/em>\uff08\u7236\u7ea7\uff09\u548c<em>\u53d1\u7968\u660e\u7ec6\u9879<\/em>\uff08\u5b50\u7ea7\uff09\u3002\u660e\u7ec6\u9879\u662f\u6807\u8bc6\u6027\u7684\uff0c\u56e0\u4e3a\u6ca1\u6709\u53d1\u7968\uff0c\u660e\u7ec6\u9879\u5c31\u6beb\u65e0\u610f\u4e49\u3002<\/p>\n<h2>9. \u4ec0\u4e48\u662f\u9012\u5f52\u5173\u7cfb\uff1f 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\u6d88\u9664\u91cd\u590d\u7ec4\u3002<\/li>\n<li><strong>\u7b2c\u4e8c\u8303\u5f0f\uff1a<\/strong>\u6d88\u9664\u90e8\u5206\u4f9d\u8d56\u3002<\/li>\n<li><strong>\u7b2c\u4e09\u8303\u5f0f\uff1a<\/strong>\u6d88\u9664\u4f20\u9012\u4f9d\u8d56\u3002<\/li>\n<\/ul>\n<p>\u66f4\u9ad8\u7684\u89c4\u8303\u5316\u901a\u5e38\u4f1a\u589e\u52a0\u8868\u548c\u5173\u7cfb\u7684\u6570\u91cf\u3002\u867d\u7136\u8fd9\u80fd\u63d0\u9ad8\u6570\u636e\u5b8c\u6574\u6027\uff0c\u4f46\u53ef\u80fd\u4f1a\u4f7f\u67e5\u8be2\u53d8\u5f97\u66f4\u590d\u6742\u3002\u5e94\u6839\u636e\u67e5\u8be2\u6027\u80fd\u9700\u6c42\u6765\u5e73\u8861\u89c4\u8303\u5316\u7684\u7a0b\u5ea6\u3002<\/p>\n<h2>14. \u9e22\u5c3e\u82b1\u7b26\u53f7\u4e0e\u9648\u6c0f\u8bb0\u6cd5\uff1a\u54ea\u79cd\u662f\u6807\u51c6\uff1f\ud83d\udc63<\/h2>\n<p>\u8bb0\u6cd5\u6307\u7684\u662f\u5173\u7cfb\u5982\u4f55\u4ee5\u89c6\u89c9\u65b9\u5f0f\u8868\u793a\u3002<\/p>\n<ul>\n<li><strong>\u9e22\u5c3e\u82b1\u7b26\u53f7\uff1a<\/strong>\u5728\u8fde\u7ebf\u672b\u7aef\u4f7f\u7528\u7ebf\u6761\u3001\u5341\u5b57\u548c\u5706\u5708\u7b49\u7b26\u53f7\u3002\u5728\u73b0\u4ee3\u5de5\u5177\u4e2d\u975e\u5e38\u5e38\u89c1\u3002<\/li>\n<li><strong>\u9648\u6c0f\u8bb0\u6cd5\uff1a<\/strong>\u7528\u83f1\u5f62\u8868\u793a\u5173\u7cfb\uff0c\u7528\u77e9\u5f62\u8868\u793a\u5b9e\u4f53\u3002\u66f4\u504f\u5411\u5b66\u672f\u7528\u9014\u3002<\/li>\n<\/ul>\n<p>\u9e22\u5c3e\u82b1\u7b26\u53f7\u901a\u5e38\u66f4\u9002\u7528\u4e8e\u5b9e\u73b0\uff0c\u56e0\u4e3a\u5b83\u80fd\u66f4\u76f4\u63a5\u5730\u6620\u5c04\u5230SQL\u7ea6\u675f\u3002\u7136\u800c\uff0c\u9648\u6c0f\u8bb0\u6cd5\u5728\u9ad8\u5c42\u6b21\u7684\u6982\u5ff5\u5efa\u6a21\u4e2d\u8868\u73b0\u4f18\u5f02\u3002<\/p>\n<h2>15. 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