{"id":1585,"date":"2026-03-23T12:02:26","date_gmt":"2026-03-23T12:02:26","guid":{"rendered":"https:\/\/www.go-diagram.com\/tw\/cardinality-participation-constraints-erd-explained\/"},"modified":"2026-03-23T12:02:26","modified_gmt":"2026-03-23T12:02:26","slug":"cardinality-participation-constraints-erd-explained","status":"publish","type":"post","link":"https:\/\/www.go-diagram.com\/tw\/cardinality-participation-constraints-erd-explained\/","title":{"rendered":"ERD\u6307\u5357\uff1a\u57fa\u6578\u8207\u53c3\u8207\u7d04\u675f\uff1a\u73fe\u5be6\u4e16\u754c\u7bc4\u4f8b\u89e3\u6790"},"content":{"rendered":"<p>\u8cc7\u6599\u6a21\u578b\u662f\u53ef\u9760\u8edf\u9ad4\u7cfb\u7d71\u7684\u9aa8\u5e79\u3002\u82e5\u7121\u660e\u78ba\u898f\u5247\u4f86\u898f\u7bc4\u8cc7\u6599\u8207\u81ea\u8eab\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u61c9\u7528\u7a0b\u5f0f\u5c07\u8b8a\u5f97\u8106\u5f31\u3001\u4e0d\u4e00\u81f4\u4e14\u96e3\u4ee5\u64f4\u5c55\u3002\u5728\u5be6\u9ad4-\u95dc\u4fc2\u5716\uff08ERD\uff09\u4e2d\uff0c\u6709\u5169\u500b\u57fa\u672c\u6982\u5ff5\u4e3b\u5c0e\u9019\u4e9b\u95dc\u806f\uff1a\u57fa\u6578\u8207\u53c3\u8207\u7d04\u675f\u3002\u7406\u89e3\u9019\u4e9b\u6982\u5ff5\u4e0d\u50c5\u662f\u5b78\u8853\u4e0a\u7684\u9700\u6c42\uff1b\u5b83\u6c7a\u5b9a\u4e86\u4f60\u7684\u8cc7\u6599\u5eab\u662f\u5426\u80fd\u6b63\u78ba\u57f7\u884c\u696d\u52d9\u908f\u8f2f\u3002<\/p>\n<p>\u672c\u6307\u5357\u5c07\u900f\u904e\u73fe\u5be6\u4e16\u754c\u60c5\u5883\u3001\u8996\u89ba\u5316\u908f\u8f2f\u8207\u5be6\u4f5c\u8003\u91cf\uff0c\u5256\u6790\u9019\u4e9b\u7d04\u675f\u3002\u6211\u5011\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u4e0d\u4f9d\u8cf4\u7279\u5b9a\u5de5\u5177\u7684\u60c5\u6cc1\u4e0b\u5b9a\u7fa9\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u78ba\u4fdd\u4f60\u7684\u908f\u8f2f\u6a21\u578b\u80fd\u9806\u5229\u8f49\u63db\u70ba\u7269\u7406\u7d50\u69cb\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Hand-drawn whiteboard infographic explaining Entity-Relationship Diagram constraints: cardinality types (one-to-one User-Profile, one-to-many Department-Employee, many-to-many Student-Course via junction table) and participation constraints (total\/mandatory with NOT NULL for OrderLine-Order, partial\/optional with NULL allowed for Product-Review), featuring crow's foot notation symbols, real-world database examples, foreign key implementation tips, and common design pitfalls for software developers and data architects\" decoding=\"async\" src=\"https:\/\/www.go-diagram.com\/wp-content\/uploads\/2026\/03\/erd-cardinality-participation-constraints-whiteboard-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83d\udd11 \u7406\u89e3\u57fa\u6578<\/h2>\n<p>\u57fa\u6578\u5b9a\u7fa9\u4e86\u5be6\u9ad4\u4e4b\u9593\u7684\u6578\u503c\u95dc\u4fc2\u3002\u5b83\u56de\u7b54\u4e86\u4ee5\u4e0b\u554f\u984c\uff1a<strong>\u300c\u5be6\u9ad4 A \u7684\u591a\u5c11\u500b\u5be6\u4f8b\u53ef\u4ee5\u8207\u5be6\u9ad4 B \u7684\u4e00\u500b\u5be6\u4f8b\u76f8\u95dc\u806f\uff1f\u300d<\/strong>\u5728\u8cc7\u6599\u5eab\u8a2d\u8a08\u4e2d\uff0c\u9019\u6c7a\u5b9a\u4e86\u5916\u9375\u7684\u653e\u7f6e\u4f4d\u7f6e\u8207\u7d22\u5f15\u7b56\u7565\u3002<\/p>\n<p>\u57fa\u6578\u95dc\u4fc2\u4e3b\u8981\u6709\u4e09\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u4e00\u5c0d\u4e00\uff081:1\uff09<\/strong><\/li>\n<li><strong>\u4e00\u5c0d\u591a\uff081:N\uff09<\/strong><\/li>\n<li><strong>\u591a\u5c0d\u591a\uff08M:N\uff09<\/strong><\/li>\n<\/ul>\n<h3>1\ufe0f\u20e3 \u4e00\u5c0d\u4e00\uff081:1\uff09<\/h3>\n<p>\u5728\u4e00\u5c0d\u4e00\u95dc\u4fc2\u4e2d\uff0c\u5be6\u9ad4 A \u4e2d\u7684\u55ae\u4e00\u8a18\u9304\u50c5\u8207\u5be6\u9ad4 B \u4e2d\u7684\u55ae\u4e00\u8a18\u9304\u76f8\u95dc\u806f\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u7576\u70ba\u4e86\u63d0\u5347\u6548\u80fd\u6216\u5b89\u5168\u6027\u800c\u5c07\u5927\u578b\u5be6\u9ad4\u62c6\u5206\u6642\uff0c\u9019\u7a2e\u60c5\u6cc1\u76f8\u7576\u5e38\u898b\u3002<\/p>\n<p><strong>\u7bc4\u4f8b\u60c5\u5883\uff1a\u4f7f\u7528\u8005\u8207\u500b\u4eba\u6a94\u6848<\/strong><\/p>\n<ul>\n<li>\u4e00\u500b<strong>\u4f7f\u7528\u8005<\/strong>\u5e33\u6236\u901a\u5e38\u5132\u5b58\u767b\u5165\u6191\u8b49\u3002<\/li>\n<li>\u4e00\u500b<strong>\u500b\u4eba\u6a94\u6848<\/strong>\u5132\u5b58\u500b\u4eba\u8cc7\u8a0a\uff0c\u4f8b\u5982\u7c21\u4ecb\u3001\u982d\u50cf\u8207\u504f\u597d\u8a2d\u5b9a\u3002<\/li>\n<li>\u4e00\u4f4d\u4f7f\u7528\u8005\u64c1\u6709\u4e14\u50c5\u64c1\u6709\u4e00\u500b\u500b\u4eba\u6a94\u6848\u3002<\/li>\n<li>\u4e00\u500b\u500b\u4eba\u6a94\u6848\u50c5\u5c6c\u65bc\u4e00\u4f4d\u4f7f\u7528\u8005\u3002<\/li>\n<\/ul>\n<p><strong>\u5be6\u4f5c\u908f\u8f2f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5728\u5176\u4e2d\u4e00\u500b\u8868\u683c\u4e2d\u653e\u7f6e\u5916\u9375\uff0c\u6307\u5411\u53e6\u4e00\u500b\u8868\u683c\u7684\u4e3b\u9375\u3002<\/li>\n<li>\u5957\u7528\u4e00\u500b<code>UNIQUE<\/code>\u7d04\u675f\u65bc\u5916\u9375\u6b04\u4f4d\u3002<\/li>\n<li>\u9019\u78ba\u4fdd\u4e0d\u6703\u6709\u5169\u500b\u4f7f\u7528\u8005\u8a18\u9304\u6307\u5411\u540c\u4e00\u500b\u500b\u4eba\u6a94\u6848\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd17 \u4e00\u5c0d\u591a\uff081:N\uff09<\/h3>\n<p>\u9019\u662f\u95dc\u4fc2\u578b\u8cc7\u6599\u5eab\u4e2d\u6700\u5e38\u898b\u7684\u95dc\u4fc2\u3002\u5be6\u9ad4 A \u4e2d\u7684\u4e00\u7b46\u8a18\u9304\u53ef\u4ee5\u8207\u5be6\u9ad4 B \u4e2d\u7684\u591a\u7b46\u8a18\u9304\u76f8\u95dc\u806f\uff0c\u4f46\u5be6\u9ad4 B \u4e2d\u7684\u6bcf\u4e00\u7b46\u8a18\u9304\u50c5\u80fd\u8207\u5be6\u9ad4 A \u4e2d\u7684\u4e00\u7b46\u8a18\u9304\u76f8\u95dc\u806f\u3002<\/p>\n<p><strong>\u7bc4\u4f8b\u60c5\u5883\uff1a\u90e8\u9580\u8207\u54e1\u5de5<\/strong><\/p>\n<ul>\n<li><strong>\u90e8\u9580<\/strong>\uff08\u4f8b\u5982\uff1a\u5de5\u7a0b\u3001\u92b7\u552e\uff09\u3002<\/li>\n<li><strong>\u54e1\u5de5<\/strong>\uff08\u55ae\u4e00\u54e1\u5de5\uff09\u3002<\/li>\n<li>\u4e00\u500b\u90e8\u9580\u50f1\u7528\u591a\u540d\u54e1\u5de5\u3002<\/li>\n<li>\u4e00\u540d\u54e1\u5de5\u50c5\u70ba\u4e00\u500b\u90e8\u9580\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n<p><strong>\u5be6\u4f5c\u908f\u8f2f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5c07\u5916\u9375\u653e\u7f6e\u65bc\u300c\u591a\u300d\u7684\u4e00\u65b9\uff08\u54e1\u5de5\u8868\u683c\uff09\u3002<\/li>\n<li>\u90e8\u9580\u8868\u683c\u4ecd\u70ba\u7236\u8868\u683c\u3002<\/li>\n<li>\u522a\u9664\u4e00\u500b\u90e8\u9580\u53ef\u80fd\u6703\u7d1a\u806f\u81f3\u54e1\u5de5\uff08\u82e5\u5141\u8a31\uff09\uff0c\u6216\u9700\u8655\u7406\u5b64\u5152\u8a18\u9304\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd04 \u591a\u5c0d\u591a\uff08M:N\uff09<\/h3>\n<p>\u5be6\u9ad4 A \u4e2d\u7684\u591a\u7b46\u8a18\u9304\u8207\u5be6\u9ad4 B \u4e2d\u7684\u591a\u7b46\u8a18\u9304\u76f8\u95dc\u806f\u3002\u82e5\u7121\u4e2d\u4ecb\uff0c\u7121\u6cd5\u5728\u7269\u7406\u8cc7\u6599\u5eab\u4e2d\u76f4\u63a5\u9023\u7d50\u9019\u4e9b\u8a18\u9304\u3002<\/p>\n<p><strong>\u7bc4\u4f8b\u60c5\u5883\uff1a\u5b78\u751f\u8207\u8ab2\u7a0b<\/strong><\/p>\n<ul>\n<li><strong>\u5b78\u751f<\/strong>\u8a3b\u518a\u591a\u9580\u8ab2\u7a0b\u3002<\/li>\n<li><strong>\u8ab2\u7a0b<\/strong>\u64c1\u6709\u591a\u540d\u5b78\u751f\u3002<\/li>\n<\/ul>\n<p><strong>\u5be6\u4f5c\u908f\u8f2f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5efa\u7acb\u4e00\u500b\u9023\u63a5\u8868\u683c\uff08\u4ea6\u7a31\u9023\u7d50\u8868\u683c\u6216\u6a4b\u63a5\u8868\u683c\uff09\u3002<\/li>\n<li>\u5305\u542b\u4f86\u81ea\u5169\u500b\u539f\u59cb\u5be6\u9ad4\u7684\u5916\u9375\u3002<\/li>\n<li>\u52a0\u5165\u8907\u5408\u4e3b\u9375\u6216\u552f\u4e00\u6027\u7d04\u675f\uff0c\u4ee5\u9632\u6b62\u91cd\u8907\u8a3b\u518a\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udd12 \u7406\u89e3\u53c3\u8207\u7d04\u675f<\/h2>\n<p>\u57fa\u6578\u544a\u8a34\u6211\u5011\u6578\u91cf\uff0c\u4f46\u53c3\u8207\u544a\u8a34\u6211\u5011\u7684<strong>\u7fa9\u52d9<\/strong>\u3002\u5b83\u5b9a\u7fa9\u4e86\u95dc\u4fc2\u662f\u5f37\u5236\u6027\u7684\u9084\u662f\u53ef\u9078\u7684\u3002\u6b64\u5340\u5225\u5c0d\u65bc\u7a7a\u503c\u8207\u8cc7\u6599\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h3>\ud83d\udccc \u5b8c\u5168\u53c3\u8207\uff08\u5f37\u5236\u6027\uff09<\/h3>\n<p>\u5be6\u9ad4\u7684\u6bcf\u4e00\u500b\u5be6\u4f8b<em>\u5fc5\u9808<\/em>\u53c3\u8207\u6b64\u95dc\u4fc2\u3002\u5728\u8cc7\u6599\u5eab\u8853\u8a9e\u4e2d\uff0c\u5916\u9375\u6b04\u4f4d\u4e0d\u80fd\u70ba\u7a7a\u3002<\/p>\n<ul>\n<li><strong>\u908f\u8f2f\uff1a<\/strong>\u5be6\u4f8b\u7121\u6cd5\u5728\u6c92\u6709\u76f8\u95dc\u5be6\u4f8b\u7684\u60c5\u6cc1\u4e0b\u5b58\u5728\u3002<\/li>\n<li><strong>\u7d04\u675f\uff1a<\/strong> <code>NOT NULL<\/code>\u5728\u5916\u9375\u6b04\u4f4d\u4e0a\u3002<\/li>\n<\/ul>\n<p><strong>\u7bc4\u4f8b\uff1a\u8a02\u55ae\u8207\u8a02\u55ae\u660e\u7d30<\/strong><\/p>\n<ul>\n<li>\u6bcf\u500b\u8a02\u55ae\u660e\u7d30<strong>\u5fc5\u9808<\/strong>\u5c6c\u65bc\u4e00\u500b\u8a02\u55ae\u3002<\/li>\n<li>\u8a02\u55ae\u660e\u7d30\u7121\u6cd5\u5728\u6c92\u6709\u8a02\u55ae\u74b0\u5883\u7684\u60c5\u6cc1\u4e0b\u5b58\u5728\u3002<\/li>\n<li>\u56e0\u6b64\uff0c\u8a02\u55ae\u660e\u7d30\u8868\u4e2d\u7684<code>order_id<\/code>\u662f\u5fc5\u586b\u7684\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udccd \u90e8\u5206\u53c3\u8207\uff08\u53ef\u9078\uff09<\/h3>\n<p>\u5be6\u9ad4\u7684\u4e00\u500b\u5be6\u4f8b<em>\u53ef\u80fd<\/em>\u53c3\u8207\u8a72\u95dc\u4fc2\uff0c\u4f46\u4e26\u975e\u5fc5\u8981\u3002\u5916\u9375\u6b04\u4f4d\u5141\u8a31\u7a7a\u503c\u3002<\/p>\n<ul>\n<li><strong>\u908f\u8f2f\uff1a<\/strong>\u5be6\u4f8b\u53ef\u4ee5\u7368\u7acb\u65bc\u95dc\u4fc2\u5b58\u5728\u3002<\/li>\n<li><strong>\u7d04\u675f\uff1a<\/strong>\u5141\u8a31<code>NULL<\/code>\u5728\u5916\u9375\u6b04\u4f4d\u4e0a\u3002<\/li>\n<\/ul>\n<p><strong>\u7bc4\u4f8b\uff1a\u7522\u54c1\u8207\u8a55\u8ad6<\/strong><\/p>\n<ul>\n<li>\u7522\u54c1\u53ef\u4ee5\u6c92\u6709\u4efb\u4f55\u8a55\u8ad6\u800c\u5b58\u5728\u3002<\/li>\n<li>\u8a55\u8ad6\u901a\u5e38\u5fc5\u9808\u5c6c\u65bc\u4e00\u500b\u7522\u54c1\u3002<\/li>\n<li>\u56e0\u6b64\uff0c\u8a55\u8ad6\u8868\u4e2d\u7684\u5916\u9375\u662f\u5fc5\u586b\u7684\uff0c\u4f46\u53cd\u5411\u9023\u7d50\uff08\u7522\u54c1\u64c1\u6709\u8a55\u8ad6\uff09\u662f\u53ef\u9078\u7684\u3002<\/li>\n<\/ul>\n<h2>\ud83c\udfe2 \u5be6\u969b\u5834\u666f\u8207\u61c9\u7528<\/h2>\n<p>\u8b93\u6211\u5011\u6aa2\u8996\u9019\u4e9b\u7d04\u675f\u4ea4\u6703\u7684\u8907\u96dc\u74b0\u5883\u3002\u7406\u89e3\u9019\u88e1\u7684\u696d\u52d9\u898f\u5247\u53ef\u9632\u6b62\u65e5\u5f8c\u8cc7\u6599\u640d\u58de\u3002<\/p>\n<h3>\ud83c\udfe5 \u91ab\u7642\u7cfb\u7d71\uff1a\u91ab\u751f\u8207\u75c5\u60a3<\/h3>\n<p>\u8003\u616e\u91ab\u9662\u7ba1\u7406\u7684\u80cc\u666f\u3002<\/p>\n<ul>\n<li><strong>\u91ab\u751f\uff1a<\/strong>\u91ab\u7642\u5c08\u696d\u4eba\u54e1\u3002<\/li>\n<li><strong>\u75c5\u60a3\uff1a<\/strong>\u63a5\u53d7\u7167\u8b77\u7684\u500b\u4eba\u3002<\/li>\n<\/ul>\n<p><strong>\u95dc\u4fc2\u5206\u6790\uff1a<\/strong><\/p>\n<ul>\n<li>\u91ab\u751f\u6703\u5728\u4e00\u6bb5\u6642\u9593\u5167\u6cbb\u7642\u8a31\u591a\u75c5\u60a3\u3002\uff081:N\uff09<\/li>\n<li>\u75c5\u60a3\u6703\u56e0\u4e0d\u540c\u72c0\u6cc1\u770b\u8a31\u591a\u91ab\u751f\u3002\uff08N:1\uff09<\/li>\n<li><strong>\u4fee\u6b63\uff1a<\/strong>\u70ba\u4e86\u8ffd\u8e64\u7279\u5b9a\u5c31\u8a3a\uff0c\u9019\u6703\u900f\u904e\u4e00\u500b\u300c<code>\u9810\u7d04<\/code>\u300d\u8868\u683c\u8f49\u70ba\u591a\u5c0d\u591a\u3002<\/li>\n<\/ul>\n<p><strong>\u53c3\u8207\u898f\u5247\uff1a<\/strong><\/p>\n<ul>\n<li><strong>\u9810\u7d04\uff1a<\/strong> \u5fc5\u9808\u6709\u91ab\u751f\uff08\u5b8c\u5168\u53c3\u8207\uff09\u3002<\/li>\n<li><strong>\u9810\u7d04\uff1a<\/strong> \u5fc5\u9808\u6709\u75c5\u60a3\uff08\u5b8c\u5168\u53c3\u8207\uff09\u3002<\/li>\n<li><strong>\u91ab\u751f\uff1a<\/strong> \u53ef\u4ee5\u6c92\u6709\u9810\u7d04\u5b58\u5728\uff08\u90e8\u5206\u53c3\u8207\u2014\u2014\u4f8b\u5982\u4f11\u5047\u4e2d\uff09\u3002<\/li>\n<\/ul>\n<h3>\ud83d\uded2 \u96fb\u5546\u5e73\u53f0\uff1a\u7522\u54c1\u8207\u5eab\u5b58<\/h3>\n<p>\u7dda\u4e0a\u96f6\u552e\u9700\u8981\u7cbe\u78ba\u7684\u5eab\u5b58\u8ffd\u8e64\u3002<\/p>\n<ul>\n<li><strong>\u7522\u54c1\uff1a<\/strong> \u7528\u65bc\u92b7\u552e\u7684\u7269\u54c1\uff08\u4f8b\u5982\u300c\u7d05\u8272\u904b\u52d5\u978b\u300d\uff09\u3002<\/li>\n<li><strong>\u5009\u5eab\uff1a<\/strong> \u7269\u7406\u4f4d\u7f6e\u3002<\/li>\n<li><strong> \u5eab\u5b58\uff1a<\/strong> \u53ef\u7528\u6578\u91cf\u3002<\/li>\n<\/ul>\n<p><strong>\u57fa\u6578\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u500b\u7522\u54c1\u53ef\u4ee5\u5b58\u5728\u65bc\u591a\u500b\u5009\u5eab\u4e2d\u3002\uff081:N\uff09<\/li>\n<li>\u4e00\u500b\u5009\u5eab\u5b58\u653e\u8a31\u591a\u7522\u54c1\u3002\uff08N:1\uff09<\/li>\n<\/ul>\n<p><strong>\u53c3\u8207\u898f\u5247\uff1a<\/strong><\/p>\n<ul>\n<li><strong>\u5eab\u5b58\u8a18\u9304\uff1a<\/strong> \u5fc5\u9808\u9023\u7d50\u81f3\u7522\u54c1\uff08\u7e3d\u8a08\uff09\u3002<\/li>\n<li><strong>\u5eab\u5b58\u8a18\u9304\uff1a<\/strong> \u5fc5\u9808\u9023\u7d50\u81f3\u5009\u5eab\uff08\u7e3d\u8a08\uff09\u3002<\/li>\n<li><strong>\u7522\u54c1\uff1a<\/strong> \u4e0d\u9700\u8981\u7acb\u5373\u5efa\u7acb\u5eab\u5b58\u8a18\u9304\uff08\u90e8\u5206\u2014\u4f8b\u5982\u9810\u8cfc\u5546\u54c1\uff09\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udcda \u5716\u66f8\u9928\u7cfb\u7d71\uff1a\u66f8\u7c4d\u8207\u4f5c\u8005<\/h3>\n<p>\u4e00\u500b\u5e38\u88ab\u8aa4\u89e3\u7684\u7d93\u5178\u7bc4\u4f8b\u3002<\/p>\n<ul>\n<li><strong>\u66f8\u7c4d\uff1a<\/strong> \u4e00\u672c\u5be6\u9ad4\u66f8\u6216 ISBN\u3002<\/li>\n<li><strong>\u4f5c\u8005\uff1a<\/strong> \u5beb\u4f5c\u8005\u3002<\/li>\n<\/ul>\n<p><strong>\u57fa\u6578\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u672c\u66f8\u64c1\u6709\u4e00\u500b\u6216\u66f4\u591a\u4f5c\u8005\u3002\uff08N:1\uff09<\/li>\n<li>\u4e00\u4f4d\u4f5c\u8005\u64b0\u5beb\u4e00\u672c\u6216\u591a\u672c\u66f8\u3002\uff08N:1\uff09<\/li>\n<li><strong>\u7d50\u679c\uff1a<\/strong> \u591a\u5c0d\u591a\u3002<\/li>\n<\/ul>\n<p><strong>\u5be6\u4f5c\uff1a<\/strong><\/p>\n<ul>\n<li>\u5efa\u7acb\u4e00\u500b <code>Book_Authors<\/code> \u9023\u7d50\u8868\u683c\u3002<\/li>\n<li>\u6b04\u4f4d\uff1a<code>book_id<\/code>, <code>author_id<\/code>.<\/li>\n<li>\u53c3\u8207\uff1a\u96d9\u65b9\u7686\u70ba\u7e3d\u8a08\u3002\u66f8\u7c4d\u8a18\u9304\u5fc5\u9808\u81f3\u5c11\u64c1\u6709\u4e00\u540d\u4f5c\u8005\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcca \u6bd4\u8f03\u8868\u683c\u4e2d\u7684\u7d04\u675f\u689d\u4ef6<\/h2>\n<p>\u4f7f\u7528\u6b64\u53c3\u8003\u8868\u683c\uff0c\u53ef\u5728\u5efa\u6a21\u6642\u5feb\u901f\u8b58\u5225\u7d04\u675f\u985e\u578b\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u7d04\u675f\u985e\u578b<\/th>\n<th>\u554f\u984c<\/th>\n<th>\u8cc7\u6599\u5eab\u5be6\u4f5c<\/th>\n<th>\u7bc4\u4f8b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>1:1 \u5167\u5bb9<\/strong><\/td>\n<td>\u4e00\u500b\u8a18\u9304\u662f\u5426\u7368\u7279\u65bc\u53e6\u4e00\u500b\uff1f<\/td>\n<td>\u5916\u9375 + \u552f\u4e00\u6027\u7d04\u675f<\/td>\n<td>\u4f7f\u7528\u8005 \u2194 \u8cc7\u6599\u6a94<\/td>\n<\/tr>\n<tr>\n<td><strong>1:N \u5167\u5bb9<\/strong><\/td>\n<td>\u4e00\u500b\u8a18\u9304\u662f\u5426\u8207\u591a\u500b\u76f8\u95dc\uff1f<\/td>\n<td>\u5b50\u8cc7\u6599\u8868\u4e2d\u7684\u5916\u9375<\/td>\n<td>\u90e8\u9580 \u2194 \u54e1\u5de5<\/td>\n<\/tr>\n<tr>\n<td><strong>M:N \u5167\u5bb9<\/strong><\/td>\n<td>\u96d9\u65b9\u662f\u5426\u90fd\u8207\u591a\u500b\u76f8\u95dc\uff1f<\/td>\n<td>\u9023\u63a5\u8868<\/td>\n<td>\u5b78\u751f \u2194 \u8ab2\u7a0b<\/td>\n<\/tr>\n<tr>\n<td><strong>\u5b8c\u5168\u53c3\u8207<\/strong><\/td>\n<td>\u9019\u500b\u95dc\u4fc2\u662f\u5fc5\u9700\u7684\u55ce\uff1f<\/td>\n<td>NOT NULL<\/td>\n<td>\u8a02\u55ae\u660e\u7d30 \u2194 \u8a02\u55ae<\/td>\n<\/tr>\n<tr>\n<td><strong>\u90e8\u5206\u53c3\u8207<\/strong><\/td>\n<td>\u9019\u500b\u95dc\u4fc2\u662f\u53ef\u9078\u7684\u55ce\uff1f<\/td>\n<td>\u5141\u8a31 NULL<\/td>\n<td>\u7522\u54c1 \u2194 \u8a55\u8ad6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u26a0\ufe0f \u8a2d\u8a08\u4e2d\u7684\u5e38\u898b\u9677\u9631<\/h2>\n<p>\u5373\u4f7f\u662f\u7d93\u9a57\u8c50\u5bcc\u7684\u8a2d\u8a08\u5e2b\u4e5f\u6703\u72af\u932f\u3002\u9019\u4e9b\u932f\u8aa4\u6703\u5c0e\u81f4\u8cc7\u6599\u7570\u5e38\u548c\u61c9\u7528\u7a0b\u5f0f\u932f\u8aa4\u3002<\/p>\n<h3>\u274c \u5c07 M:N \u932f\u8aa4\u89e3\u8b80\u70ba 1:N<\/h3>\n<p>\u76f4\u63a5\u5132\u5b58\u591a\u5c0d\u591a\u95dc\u4fc2\u901a\u5e38\u6703\u5c0e\u81f4\u8cc7\u6599\u91cd\u8907\u3002<\/p>\n<ul>\n<li><strong>\u932f\u8aa4\uff1a<\/strong> \u52a0\u5165\u4e00\u500b <code>\u8ab2\u7a0b\u7de8\u865f<\/code>\u5230\u4e00\u500b<code>\u5b78\u751f<\/code>\u8868\u683c\u3002\u9019\u6703\u5f37\u5236\u5b78\u751f\u9078\u64c7\u4e00\u500b\u4e3b\u8981\u8ab2\u7a0b\uff0c\u5ffd\u7565\u5176\u4ed6\u8ab2\u7a0b\u3002<\/li>\n<li><strong>\u6b63\u78ba\u505a\u6cd5\uff1a<\/strong>\u4f7f\u7528\u95dc\u806f\u8868\u683c\uff0c\u5141\u8a31\u6bcf\u4f4d\u5b78\u751f\u6709\u591a\u6b21\u8a3b\u518a\u3002<\/li>\n<\/ul>\n<h3>\u274c \u904e\u5ea6\u4f7f\u7528\u5b8c\u5168\u53c3\u8207<\/h3>\n<p>\u5c07\u6bcf\u500b\u95dc\u4fc2\u8a2d\u70ba\u5fc5\u586b\u6703\u9650\u5236\u5f48\u6027\u3002<\/p>\n<ul>\n<li><strong>\u554f\u984c\uff1a<\/strong>\u5982\u679c\u4e00\u500b<code>\u7d93\u7406<\/code>\u8868\u683c\u9700\u8981\u4e00\u500b<code>\u90e8\u9580\u7de8\u865f<\/code>\u70ba\u975e\u7a7a\u503c\uff0c\u76f4\u5230\u90e8\u9580\u5b58\u5728\u4e4b\u524d\uff0c\u4f60\u7121\u6cd5\u8b93\u65b0\u7d93\u7406\u52a0\u5165\u3002<\/li>\n<li><strong>\u89e3\u6c7a\u65b9\u6848\uff1a<\/strong>\u5982\u679c\u7d93\u7406\u53ef\u80fd\u7a0d\u5f8c\u88ab\u91cd\u65b0\u5206\u914d\uff0c\u6216\u90e8\u9580\u662f\u7570\u6b65\u5275\u5efa\u7684\uff0c\u5247\u5141\u8a31\u70ba\u7a7a\u503c\u3002<\/li>\n<\/ul>\n<h3>\u274c \u5ffd\u7565\u591a\u5c0d\u591a\u95dc\u4fc2\u4e2d\u7684\u7a7a\u503c\u8655\u7406<\/h3>\n<p>\u95dc\u806f\u8868\u683c\u5f88\u5c11\u61c9\u8a72\u5141\u8a31\u5176\u5916\u9375\u6b04\u4f4d\u70ba\u7a7a\u503c\u3002<\/p>\n<ul>\n<li><strong>\u908f\u8f2f\uff1a<\/strong>\u4e00\u500b\u9023\u7d50\u5fc5\u9808\u9023\u63a5\u5169\u500b\u6709\u6548\u7684\u5be6\u9ad4\u3002\u5982\u679c\u95dc\u806f\u8868\u683c\u4e2d\u5b58\u5728\u4e00\u5217\uff0c\u5247\u5169\u500b\u5916\u9375\u90fd\u61c9\u586b\u5165\u3002<\/li>\n<li><strong>\u7d04\u675f\uff1a<\/strong>\u5b9a\u7fa9\u8907\u5408\u4e3b\u9375\u4ee5\u9632\u6b62\u91cd\u8907\u9023\u7d50\uff0c\u4e26\u78ba\u4fdd\u5169\u500bID\u90fd\u5b58\u5728\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f \u5be6\u4f5c\u8003\u91cf<\/h2>\n<p>\u4e00\u65e6\u908f\u8f2f\u6a21\u578b\u5b9a\u7fa9\u5b8c\u6210\uff0c\u9019\u4e9b\u7d04\u675f\u5c31\u6703\u8f49\u63db\u70ba\u5be6\u969b\u7684\u8cc7\u6599\u5eab\u7d50\u69cb\u3002\u4ee5\u4e0b\u8003\u91cf\u53ef\u78ba\u4fdd\u8cc7\u6599\u5b8c\u6574\u6027\u3002<\/p>\n<h3>\ud83d\udd39 \u5916\u9375\u64cd\u4f5c<\/h3>\n<p>\u7576\u7236\u8a18\u9304\u8b8a\u66f4\u6216\u522a\u9664\u6642\uff0c\u5b50\u8a18\u9304\u6703\u600e\u9ebc\u6a23\uff1f\u9019\u7531\u53c3\u8207\u7d04\u675f\u5b9a\u7fa9\u3002<\/p>\n<ul>\n<li><strong>\u7d1a\u806f\uff1a<\/strong>\u5982\u679c\u7236\u8a18\u9304\u88ab\u522a\u9664\uff0c\u5b50\u8a18\u9304\u4e5f\u6703\u88ab\u522a\u9664\u3002\u7576\u5b50\u8a18\u9304\u7121\u6cd5\u5728\u6c92\u6709\u7236\u8a18\u9304\u7684\u60c5\u6cc1\u4e0b\u5b58\u5728\u6642\u4f7f\u7528\uff08\u5b8c\u5168\u53c3\u8207\uff09\u3002<\/li>\n<li><strong>\u8a2d\u70ba\u7a7a\u503c\uff1a<\/strong>\u5982\u679c\u7236\u8a18\u9304\u88ab\u522a\u9664\uff0c\u5b50\u8a18\u9304\u7684\u5916\u9375\u6703\u8b8a\u70ba\u7a7a\u503c\u3002\u7576\u5b50\u8a18\u9304\u53ef\u4ee5\u7368\u7acb\u5b58\u5728\u6642\u4f7f\u7528\uff08\u90e8\u5206\u53c3\u8207\uff09\u3002<\/li>\n<li><strong>\u9650\u5236\uff1a<\/strong> \u5982\u679c\u5b58\u5728\u5b50\u9805\uff0c\u5247\u7981\u6b62\u522a\u9664\u3002\u78ba\u4fdd\u8cc7\u6599\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd39 \u7d22\u5f15\u7b56\u7565<\/h3>\n<p>\u7d04\u675f\u6703\u5f71\u97ff\u6548\u80fd\u3002\u5916\u9375\u901a\u5e38\u9700\u8981\u7d22\u5f15\u4ee5\u52a0\u5feb\u9023\u63a5\u901f\u5ea6\u3002<\/p>\n<ul>\n<li><strong>1:N \u95dc\u4fc2\uff1a<\/strong> \u5728\u300c\u591a\u300d\u7684\u4e00\u65b9\u8868\u683c\u4e2d\uff0c\u5c0d\u5916\u9375\u6b04\u4f4d\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li><strong>M:N \u95dc\u4fc2\uff1a<\/strong> \u5728\u9023\u63a5\u8868\u4e2d\uff0c\u5c0d\u5169\u500b\u5916\u9375\u90fd\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li><strong>1:1 \u95dc\u4fc2\uff1a<\/strong> \u5728\u5177\u6709\u552f\u4e00\u6027\u7d04\u675f\u7684\u8868\u683c\u4e2d\uff0c\u5c0d\u5916\u9375\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h3>\ud83d\udd39 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