{"id":1646,"date":"2026-04-08T07:46:40","date_gmt":"2026-04-08T07:46:40","guid":{"rendered":"https:\/\/www.viz-note.com\/cn\/erd-elements-confusion-breakdown\/"},"modified":"2026-04-08T07:46:40","modified_gmt":"2026-04-08T07:46:40","slug":"erd-elements-confusion-breakdown","status":"publish","type":"post","link":"https:\/\/www.viz-note.com\/cn\/erd-elements-confusion-breakdown\/","title":{"rendered":"\u5bfc\u81f4\u8bef\u89e3\u7684\u5b9e\u4f53\u5173\u7cfb\u56fe\u5143\u7d20\u7684\u7ec4\u4ef6\u5206\u89e3"},"content":{"rendered":"<p>\u8bbe\u8ba1\u4e00\u4e2a\u5065\u58ee\u7684\u6570\u636e\u5e93\u6a21\u5f0f\u9700\u8981\u7cbe\u786e\u6027\u3002\u5b9e\u4f53\u5173\u7cfb\u56fe\uff08ERD\uff09\u662f\u8be5\u7ed3\u6784\u7684\u84dd\u56fe\uff0c\u5c06\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\u8f6c\u5316\u4e3a\u5f00\u53d1\u4eba\u5458\u548c\u5229\u76ca\u76f8\u5173\u8005\u80fd\u591f\u7406\u89e3\u7684\u89c6\u89c9\u683c\u5f0f\u3002\u7136\u800c\uff0c\u5c3d\u7ba1\u5176\u5177\u6709\u5b9e\u7528\u6027\uff0cERD\u5728\u5efa\u6a21\u9636\u6bb5\u5e38\u5e38\u6210\u4e3a\u8bef\u89e3\u7684\u6765\u6e90\u3002\u7b26\u53f7\u7684\u6a21\u7cca\u6027\u3001\u57fa\u6570\u7684\u8bef\u8bfb\u4ee5\u53ca\u5c5e\u6027\u7c7b\u578b\u7684\u6df7\u6dc6\uff0c\u53ef\u80fd\u5bfc\u81f4\u5f00\u53d1\u5468\u671f\u540e\u671f\u51fa\u73b0\u91cd\u5927\u8fd4\u5de5\u3002<\/p>\n<p>\u672c\u6307\u5357\u8be6\u7ec6\u5206\u6790\u4e86\u5728ERD\u4e2d\u5e38\u5bfc\u81f4\u6570\u636e\u5e93\u67b6\u6784\u5e08\u548c\u5de5\u7a0b\u5e08\u4ea7\u751f\u6469\u64e6\u7684\u7279\u5b9a\u7ec4\u4ef6\u3002\u901a\u8fc7\u660e\u786e\u5f3a\u5b9e\u4f53\u4e0e\u5f31\u5b9e\u4f53\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u89e3\u6790\u5173\u7cfb\u7b26\u53f7\uff0c\u5e76\u5206\u6790\u5c5e\u6027\u5206\u7c7b\uff0c\u6211\u4eec\u53ef\u4ee5\u51cf\u5c11\u9519\u8bef\uff0c\u786e\u4fdd\u6700\u7ec8\u7684\u6570\u636e\u6a21\u578b\u51c6\u786e\u53cd\u6620\u5b9e\u9645\u8fd0\u8425\u9700\u6c42\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Cartoon infographic explaining Entity Relationship Diagram components that commonly cause confusion: strong vs weak entities with rectangle notation, cardinality symbols (1, 0..1, 1..N, 0..N) with crow's foot notation, primary\/foreign\/composite key identification, recursive self-referencing relationships, common modeling pitfalls like over-normalization and missing junction tables, and validation best practices for database schema design\" decoding=\"async\" src=\"https:\/\/www.viz-note.com\/wp-content\/uploads\/2026\/04\/erd-components-confusion-infographic-cartoon.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83c\udfd7\ufe0f \u5b9e\u4f53\u7c7b\u578b\uff1a\u533a\u5206\u5f3a\u5b9e\u4f53\u4e0e\u5f31\u5b9e\u4f53<\/h2>\n<p>\u4efb\u4f55ERD\u7684\u6838\u5fc3\u90fd\u662f\u5b9e\u4f53\u3002\u5b83\u4eec\u4ee3\u8868\u4e86\u5b58\u50a8\u6570\u636e\u7684\u5bf9\u8c61\u6216\u6982\u5ff5\u3002\u5c3d\u7ba1\u5927\u591a\u6570\u4ece\u4e1a\u8005\u7406\u89e3\u8868\u7684\u6982\u5ff5\uff0c\u4f46\u5f3a\u5b9e\u4f53\u4e0e\u5f31\u5b9e\u4f53\u4e4b\u95f4\u7684\u533a\u522b\u5f80\u5f80\u662f\u7b2c\u4e00\u4e2a\u4e3b\u8981\u8bef\u89e3\u7684\u6765\u6e90\u3002<\/p>\n<ul>\n<li><strong>\u5f3a\u5b9e\u4f53\uff1a<\/strong> \u8fd9\u4e9b\u5b9e\u4f53\u62e5\u6709\u81ea\u5df1\u7684\u4e3b\u952e\u3002\u5b83\u4eec\u662f\u72ec\u7acb\u7684\uff0c\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u5b9e\u4f53\u8fdb\u884c\u8bc6\u522b\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a<code>\u5ba2\u6237<\/code>\u5b9e\u4f53\u901a\u5e38\u5177\u6709\u552f\u4e00\u7684\u5ba2\u6237ID\uff0c\u56e0\u6b64\u5c5e\u4e8e\u5f3a\u5b9e\u4f53\u3002<\/li>\n<li><strong>\u5f31\u5b9e\u4f53\uff1a<\/strong> \u8fd9\u4e9b\u5b9e\u4f53\u4ec5\u9760\u81ea\u8eab\u5c5e\u6027\u65e0\u6cd5\u88ab\u552f\u4e00\u8bc6\u522b\u3002\u5b83\u4eec\u4f9d\u8d56\u4e8e\u4e0e\u5176\u4ed6\u5b9e\u4f53\u7684\u5173\u7cfb\uff08\u79f0\u4e3a\u8bc6\u522b\u7236\u5b9e\u4f53\uff09\u624d\u80fd\u5b58\u5728\u3002\u4e00\u4e2a<code>\u660e\u7ec6\u9879<\/code>\u5728\u8ba2\u5355\u7cfb\u7edf\u4e2d\uff0c\u53ef\u80fd\u4ec5\u5b58\u5728\u4e8e\u7279\u5b9a<code>\u8ba2\u5355<\/code>.<\/li>\n<\/ul>\n<p>\u6df7\u6dc6\u901a\u5e38\u6e90\u4e8e\u5b83\u4eec\u7684\u89c6\u89c9\u8868\u793a\u65b9\u5f0f\u3002\u5f3a\u5b9e\u4f53\u901a\u5e38\u4ee5\u6807\u51c6\u77e9\u5f62\u7ed8\u5236\uff0c\u800c\u5f31\u5b9e\u4f53\u5219\u5e38\u4ee5\u53cc\u7ebf\u77e9\u5f62\u8868\u793a\u3002\u672a\u80fd\u5728\u89c6\u89c9\u4e0a\u533a\u5206\u8fd9\u4e24\u8005\uff0c\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5e93\u5b9e\u73b0\u9519\u8bef\uff0c\u5373\u5728\u521b\u5efa\u5f31\u5b9e\u4f53\u8868\u65f6\u672a\u8bbe\u7f6e\u5fc5\u8981\u7684\u5916\u952e\u7ea6\u675f\u6765\u5f3a\u5236\u5176\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n<h3>\u8bef\u5206\u7c7b\u7684\u5f71\u54cd<\/h3>\n<p>\u5f53\u5f31\u5b9e\u4f53\u88ab\u9519\u8bef\u5730\u5efa\u6a21\u4e3a\u5f3a\u5b9e\u4f53\u65f6\uff0c\u6570\u636e\u5e93\u53ef\u80fd\u5141\u8bb8\u8bb0\u5f55\u5728\u6ca1\u6709\u7236\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u5b58\u5728\uff0c\u4ece\u800c\u4ea7\u751f\u5b64\u7acb\u6570\u636e\u3002\u76f8\u53cd\uff0c\u5c06\u5f3a\u5b9e\u4f53\u5efa\u6a21\u4e3a\u5f31\u5b9e\u4f53\u4f1a\u5f3a\u5236\u4e0d\u5fc5\u8981\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u53ef\u80fd\u9650\u5236\u8be5\u5b9e\u4f53\u5728\u4e3b\u8981\u4e0a\u4e0b\u6587\u4e4b\u5916\u7684\u53ef\u7528\u6027\u3002\u5728\u8d4b\u4e88\u5b9e\u4f53\u5f3a\u5b9e\u4f53\u72b6\u6001\u4e4b\u524d\uff0c\u5fc5\u987b\u5224\u65ad\u8be5\u5bf9\u8c61\u662f\u5426\u80fd\u591f\u72ec\u7acb\u5b58\u5728\u3002<\/p>\n<ul>\n<li><strong>\u72ec\u7acb\u6027\u68c0\u67e5\uff1a<\/strong>\u8be5\u8bb0\u5f55\u80fd\u5426\u5728\u6ca1\u6709\u4e0e\u5176\u4ed6\u8bb0\u5f55\u5173\u8054\u7684\u60c5\u51b5\u4e0b\u5b58\u5728\uff1f<\/li>\n<li><strong>\u6807\u8bc6\u7b26\u6765\u6e90\uff1a<\/strong>\u552f\u4e00\u7684ID\u662f\u6765\u81ea\u5b9e\u4f53\u672c\u8eab\uff0c\u8fd8\u662f\u6765\u81ea\u5173\u7cfb\uff1f<\/li>\n<li><strong>\u5b58\u5728\u4f9d\u8d56\uff1a<\/strong>\u5220\u9664\u7236\u8bb0\u5f55\u662f\u5426\u4f1a\u81ea\u52a8\u5220\u9664\u5b50\u8bb0\u5f55\uff1f<\/li>\n<\/ul>\n<h2>\ud83d\udd17 \u5173\u7cfb\u57fa\u6570\u4e0e\u53ef\u9009\u6027<\/h2>\n<p>\u5173\u7cfb\u5b9a\u4e49\u4e86\u5b9e\u4f53\u4e4b\u95f4\u7684\u4ea4\u4e92\u65b9\u5f0f\u3002\u57fa\u6570\u6307\u660e\u4e86\u4e00\u4e2a\u5b9e\u4f53\u7684\u5b9e\u4f8b\u53ef\u4ee5\u6216\u5fc5\u987b\u4e0e\u53e6\u4e00\u4e2a\u5b9e\u4f53\u7684\u6bcf\u4e2a\u5b9e\u4f8b\u5173\u8054\u7684\u6570\u91cf\u3002\u7531\u4e8e\u7b26\u53f7\u8868\u793a\u98ce\u683c\u4e0d\u540c\uff0c\u8fd9\u662f\u6700\u5bb9\u6613\u5f15\u8d77\u6df7\u6dc6\u7684\u9886\u57df\u4e4b\u4e00\u3002<\/p>\n<h3>\u57fa\u6570\u7b26\u53f7<\/h3>\n<p>\u5728\u56fe\u4e2d\u8868\u793a\u57fa\u6570\u6709\u591a\u79cd\u65b9\u5f0f\u3002\u4e00\u4e9b\u4f7f\u7528\u201c1\u201d\u6216\u201cN\u201d\u7b49\u6587\u672c\u6807\u7b7e\uff0c\u53e6\u4e00\u4e9b\u5219\u4f7f\u7528\u4e4c\u9e26\u722a\u7b26\u53f7\u3002\u6df7\u5408\u4f7f\u7528\u8fd9\u4e9b\u98ce\u683c\u6216\u8bef\u89e3\u7b26\u53f7\uff0c\u4f1a\u5bfc\u81f4\u7269\u7406\u6a21\u5f0f\u4e2d\u51fa\u73b0\u903b\u8f91\u6f0f\u6d1e\u3002<\/p>\n<table border=\"1\" style=\"width:100%; border-collapse: collapse;\">\n<tr>\n<th>\u7b26\u53f7 \/ \u6807\u7b7e<\/th>\n<th>\u542b\u4e49<\/th>\n<th>\u793a\u4f8b\u573a\u666f<\/th>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>\u6070\u597d\u4e00\u4e2a<\/td>\n<td>\u4e00\u4e2a\u4eba\u6070\u597d\u6709\u4e00\u4e2a\u793e\u4f1a\u4fdd\u969c\u53f7\u7801\u3002<\/td>\n<\/tr>\n<tr>\n<td>0..1<\/td>\n<td>\u96f6\u4e2a\u6216\u4e00\u4e2a<\/td>\n<td>\u4e00\u4e2a\u4eba\u53ef\u80fd\u6ca1\u6709\u4e2d\u95f4\u540d\uff0c\u4e5f\u53ef\u80fd\u6709\u4e00\u4e2a\u4e2d\u95f4\u540d\u3002<\/td>\n<\/tr>\n<tr>\n<td>1..1<\/td>\n<td>\u4e00\u4e2a\u4e14\u4ec5\u4e00\u4e2a<\/td>\n<td>\u4e00\u4e2a\u9879\u76ee\u5fc5\u987b\u6307\u5b9a\u4e00\u4e2a\u9879\u76ee\u7ecf\u7406\u3002<\/td>\n<\/tr>\n<tr>\n<td>0..N<\/td>\n<td>\u96f6\u5230\u591a\u4e2a<\/td>\n<td>\u4e00\u4e2a\u8ba2\u5355\u53ef\u4ee5\u5305\u542b\u96f6\u4e2a\u6216\u591a\u4e2a\u660e\u7ec6\u9879\u3002<\/td>\n<\/tr>\n<tr>\n<td>1..N<\/td>\n<td>\u4e00\u4e2a\u5230\u591a\u4e2a<\/td>\n<td>\u4e00\u4e2a\u90e8\u95e8\u5fc5\u987b\u81f3\u5c11\u6709\u4e00\u4e2a\u5458\u5de5\u3002<\/td>\n<\/tr>\n<\/table>\n<h3>\u53ef\u9009\u6027\u4e0e\u7a7a\u503c\u6027<\/h3>\n<p>\u53ef\u9009\u6027\u6307\u7684\u662f\u5173\u7cfb\u662f\u5f3a\u5236\u6027\u7684\u8fd8\u662f\u53ef\u9009\u7684\u3002\u8fd9\u76f4\u63a5\u5f71\u54cd\u6570\u636e\u5e93\u8868\u4e2d\u5916\u952e\u7684\u5b9a\u4e49\u3002\u5982\u679c\u5173\u7cfb\u662f\u5f3a\u5236\u6027\u7684\uff0c\u5916\u952e\u5217\u4e0d\u80fd\u4e3a null\u3002\u5982\u679c\u662f\u53ef\u9009\u7684\uff0c\u5219\u53ef\u4ee5\u4e3a null\u3002<\/p>\n<p>\u5f53\u56fe\u793a\u4e2d\u663e\u793a\u5b9e\u7ebf\u4e0e\u865a\u7ebf\u65f6\uff0c\u5e38\u5e38\u4f1a\u4ea7\u751f\u6df7\u6dc6\u3002\u5982\u679c\u6ca1\u6709\u660e\u786e\u7684\u56fe\u4f8b\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u80fd\u4f1a\u8bef\u8ba4\u4e3a\u5b58\u5728\u5f3a\u5236\u5173\u7cfb\uff0c\u4ece\u800c\u5728\u6570\u636e\u8f93\u5165\u65f6\u5bfc\u81f4\u7ea6\u675f\u8fdd\u89c4\u3002\u5728\u6a21\u578b\u6587\u6863\u4e2d\u660e\u786e\u8bb0\u5f55\u7ebf\u578b\u7684\u542b\u4e49\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<ul>\n<li><strong>\u5f3a\u5236\u5173\u7cfb\uff1a<\/strong> \u5b50\u8bb0\u5f55\u5fc5\u987b\u5b58\u5728\uff0c\u7236\u8bb0\u5f55\u624d\u80fd\u6709\u6548\u3002<\/li>\n<li><strong>\u53ef\u9009\u5173\u7cfb\uff1a<\/strong> \u5b50\u8bb0\u5f55\u53ef\u4ee5\u5728\u6ca1\u6709\u7236\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\uff0c\u6216\u8005\u7236\u8bb0\u5f55\u53ef\u4ee5\u5728\u6ca1\u6709\u5b50\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u5b58\u5728\u3002<\/li>\n<li><strong>\u5916\u952e\u7ea6\u675f\uff1a<\/strong> \u5fc5\u987b\u8bbe\u7f6e\u4e3a <code>NOT NULL<\/code> \u7528\u4e8e\u5f3a\u5236\u5173\u7cfb\uff0c<code>NULL<\/code> \u53ef\u7528\u4e8e\u53ef\u9009\u5173\u7cfb\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udd11 \u5c5e\u6027\u4e0e\u5173\u952e\u6807\u8bc6<\/h2>\n<p>\u5c5e\u6027\u662f\u5b9e\u4f53\u7684\u7279\u6027\u3002\u867d\u7136\u770b\u4f3c\u7b80\u5355\uff0c\u4f46\u5c06\u5c5e\u6027\u5206\u7c7b\u4e3a\u952e\u3001\u5916\u952e\u548c\u7b80\u5355\u5c5e\u6027\uff0c\u5e38\u5e38\u4f1a\u5bfc\u81f4\u89c4\u8303\u5316\u548c\u67e5\u8be2\u6027\u80fd\u65b9\u9762\u7684\u9519\u8bef\u3002<\/p>\n<h3>\u4e3b\u952e\u4e0e\u5916\u952e<\/h3>\n<p>\u4e3b\u952e\uff08PK\uff09\u552f\u4e00\u6807\u8bc6\u4e00\u884c\u3002\u5916\u952e\uff08FK\uff09\u5c06\u4e00\u884c\u94fe\u63a5\u5230\u7236\u8868\u3002\u5f53\u4f7f\u7528\u81ea\u7136\u952e\u4ee3\u66ff\u4ee3\u7406\u952e\uff0c\u6216\u4e3b\u952e\u5728\u56fe\u4e2d\u672a\u4e00\u81f4\u5b9a\u4e49\u65f6\uff0c\u5c31\u4f1a\u4ea7\u751f\u6df7\u6dc6\u3002<\/p>\n<ul>\n<li><strong>\u81ea\u7136\u952e\uff1a<\/strong>\u6570\u636e\u4e2d\u81ea\u7136\u5b58\u5728\u7684\u952e\uff0c\u4f8b\u5982\u793e\u4f1a\u5b89\u5168\u53f7\u7801\u6216\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u3002\u8fd9\u4e9b\u952e\u53ef\u80fd\u4f1a\u53d1\u751f\u53d8\u5316\uff0c\u4ece\u800c\u5bfc\u81f4\u6570\u636e\u5b8c\u6574\u6027\u95ee\u9898\u3002<\/li>\n<li><strong>\u4ee3\u7406\u952e\uff1a<\/strong>\u7531\u7cfb\u7edf\u751f\u6210\u7684\u4eba\u5de5\u952e\uff0c\u4f8b\u5982\u81ea\u589e\u6574\u6570\u3002\u901a\u5e38\u66f4\u503e\u5411\u4e8e\u4f7f\u7528\u6b64\u7c7b\u952e\u4ee5\u4fdd\u8bc1\u7a33\u5b9a\u6027\u3002<\/li>\n<\/ul>\n<h3>\u590d\u5408\u952e<\/h3>\n<p>\u590d\u5408\u952e\u7531\u4e24\u4e2a\u6216\u66f4\u591a\u5217\u7ec4\u6210\uff0c\u5408\u8d77\u6765\u552f\u4e00\u6807\u8bc6\u4e00\u6761\u8bb0\u5f55\u3002\u8fd9\u5728\u7528\u4e8e\u89e3\u51b3\u591a\u5bf9\u591a\u5173\u7cfb\u7684\u8fde\u63a5\u8868\u4e2d\u5f88\u5e38\u89c1\u3002\u8fd9\u91cc\u7684\u6df7\u6dc6\u5728\u4e8e\u5217\u7684\u987a\u5e8f\u4ee5\u53ca\u54ea\u4e2a\u8868\u6301\u6709\u8be5\u952e\u3002<\/p>\n<p>\u5982\u679c\u590d\u5408\u952e\u4e2d\u5217\u7684\u987a\u5e8f\u5728\u76f8\u5173\u8868\u4e4b\u95f4\u6ca1\u6709\u4fdd\u6301\u4e00\u81f4\uff0c\u8fde\u63a5\u64cd\u4f5c\u5c06\u5931\u8d25\u6216\u9700\u8981\u590d\u6742\u7684\u5f3a\u5236\u8f6c\u6362\u3002\u5728\u4e3b\u952e\u5b9a\u4e49\u4e2d\u660e\u786e\u8bb0\u5f55\u5217\u7684\u786e\u5207\u987a\u5e8f\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<h2>\ud83d\udd01 \u9012\u5f52\u5173\u7cfb<\/h2>\n<p>\u5f53\u4e00\u4e2a\u5b9e\u4f53\u4e0e\u81ea\u8eab\u76f8\u5173\u65f6\uff0c\u5c31\u4f1a\u53d1\u751f\u9012\u5f52\u5173\u7cfb\u3002\u8fd9\u5e38\u7528\u4e8e\u7ec4\u7ec7\u7ed3\u6784\u56fe\u6216\u7269\u6599\u6e05\u5355\u7b49\u5c42\u6b21\u7ed3\u6784\u4e2d\u3002\u6df7\u6dc6\u6e90\u4e8e\u89c6\u89c9\u8868\u793a\uff0c\u56e0\u4e3a\u8fde\u7ebf\u5c06\u5b9e\u4f53\u8fde\u63a5\u5230\u81ea\u8eab\u3002<\/p>\n<p>\u5982\u679c\u6ca1\u6709\u660e\u786e\u7684\u6807\u7b7e\uff0c\u901a\u5e38\u96be\u4ee5\u5224\u65ad\u5173\u7cfb\u7684\u54ea\u4e00\u4fa7\u4ee3\u8868\u7236\u7ea7\uff0c\u54ea\u4e00\u4fa7\u4ee3\u8868\u5b50\u7ea7\u3002\u4f8b\u5982\uff0c\u5728\u5458\u5de5\u8868\u4e2d\uff0c\u4e00\u540d\u5458\u5de5\u53ef\u80fd\u7ba1\u7406\u53e6\u4e00\u540d\u5458\u5de5\u3002\u8be5\u5173\u7cfb\u5fc5\u987b\u660e\u786e\u6307\u51fa\uff0c\u5458\u5de5\u53ef\u4ee5\u662f\u5176\u4ed6\u5458\u5de5\u7684\u7ba1\u7406\u8005\u3002<\/p>\n<ul>\n<li><strong>\u81ea\u5f15\u7528\uff1a<\/strong> \u8868\u4e2d\u7684\u5916\u952e\u6307\u5411\u540c\u4e00\u8868\u7684\u4e3b\u952e\u3002<\/li>\n<li><strong>\u7a7a\u503c\u5904\u7406\uff1a<\/strong> \u5c42\u6b21\u7ed3\u6784\u7684\u6839\u8282\u70b9\u5728\u7ecf\u7406ID\u5217\u4e2d\u901a\u5e38\u4e3aNULL\u503c\u3002<\/li>\n<li><strong>\u6df1\u5ea6\u9650\u5236\uff1a<\/strong> \u5982\u679c\u5c42\u6b21\u7ed3\u6784\u975e\u5e38\u6df1\uff0c\u9012\u5f52\u67e5\u8be2\u53ef\u80fd\u4f1a\u6210\u4e3a\u6027\u80fd\u74f6\u9888\u3002<\/li>\n<\/ul>\n<h2>\u26a0\ufe0f \u5e38\u89c1\u7684\u5efa\u6a21\u9677\u9631<\/h2>\n<p>\u9664\u4e86\u5177\u4f53\u5143\u7d20\u4e4b\u5916\uff0c\u67d0\u4e9b\u7ed3\u6784\u6a21\u5f0f\u5728\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\u5e38\u5e38\u5bfc\u81f4\u6df7\u6dc6\u3002\u53ca\u65e9\u8bc6\u522b\u8fd9\u4e9b\u9677\u9631\u53ef\u4ee5\u907f\u514d\u6602\u8d35\u7684\u6a21\u5f0f\u8fc1\u79fb\u3002<\/p>\n<h3>1. \u8fc7\u5ea6\u89c4\u8303\u5316<\/h3>\n<p>\u867d\u7136\u89c4\u8303\u5316\u53ef\u4ee5\u51cf\u5c11\u5197\u4f59\uff0c\u4f46\u8fc7\u5ea6\u89c4\u8303\u5316\u4f1a\u4f7f\u67e5\u8be2\u96be\u4ee5\u9605\u8bfb\u548c\u6267\u884c\u3002\u4e3a\u6bcf\u4e2a\u5c5e\u6027\u90fd\u521b\u5efa\u5355\u72ec\u7684\u8868\u4f1a\u4e0d\u5fc5\u8981\u5730\u5206\u5272\u6570\u636e\u3002\u5728\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09\u4e0e\u5b9e\u9645\u67e5\u8be2\u6027\u80fd\u4e4b\u95f4\u4fdd\u6301\u5e73\u8861\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h3>2. \u65e0\u8fde\u63a5\u8868\u7684\u591a\u5bf9\u591a\u5173\u7cfb<\/h3>\n<p>\u5728\u7269\u7406\u6570\u636e\u5e93\u4e2d\uff0c\u591a\u5bf9\u591a\u5173\u7cfb\u4e0d\u80fd\u76f4\u63a5\u5b58\u5728\u3002\u5fc5\u987b\u901a\u8fc7\u4f7f\u7528\u8fde\u63a5\u8868\uff08\u5173\u8054\u5b9e\u4f53\uff09\u5c06\u5176\u5206\u89e3\u4e3a\u4e24\u4e2a\u4e00\u5bf9\u591a\u5173\u7cfb\u3002\u5fd8\u8bb0\u8fd9\u4e00\u6b65\u9aa4\u4f1a\u5bfc\u81f4\u6a21\u578b\u65e0\u6cd5\u5728\u6807\u51c6SQL\u4e2d\u5b9e\u73b0\u3002<\/p>\n<ul>\n<li><strong>\u903b\u8f91\u6a21\u578b\u4e0e\u7269\u7406\u6a21\u578b\uff1a<\/strong> \u903b\u8f91\u6a21\u578b\u53ef\u80fd\u663e\u793a\u4e24\u4e2a\u5b9e\u4f53\u4e4b\u95f4\u5b58\u5728\u4e00\u6761\u76f4\u63a5\u8fde\u7ebf\uff0c\u5176\u57fa\u6570\u4e3aN:N\u3002<\/li>\n<li><strong> \u7269\u7406\u5b9e\u73b0\uff1a<\/strong> \u8fd9\u6761\u8fde\u7ebf\u5fc5\u987b\u901a\u8fc7\u4e00\u4e2a\u65b0\u8868\u6765\u62c6\u5206\uff0c\u8be5\u8868\u5305\u542b\u6765\u81ea\u53cc\u65b9\u7684\u5916\u952e\u3002<\/li>\n<\/ul>\n<h3>3. \u547d\u540d\u7ea6\u5b9a\u4e0d\u4e00\u81f4<\/h3>\n<p>\u4f7f\u7528\u6df7\u5408\u547d\u540d\u98ce\u683c\uff08\u4f8b\u5982\uff0c<code>customer_id<\/code> \u4e0e <code>CustomerID<\/code> \u4e0e <code>customerId<\/code>\uff09\u4f1a\u5bfc\u81f4\u7f16\u5199\u67e5\u8be2\u7684\u5f00\u53d1\u4eba\u5458\u611f\u5230\u56f0\u60d1\u3002\u5e94\u5728\u9879\u76ee\u521d\u671f\u5efa\u7acb\u6807\u51c6\u5316\u7684\u547d\u540d\u7ea6\u5b9a\u3002<\/p>\n<ul>\n<li><strong>\u5c0f\u5199\u52a0\u4e0b\u5212\u7ebf\uff1a<\/strong> <code>order_line_items<\/code><\/li>\n<li><strong>PascalCase\uff1a<\/strong> <code>OrderLineItems<\/code><\/li>\n<li><strong>\u9a7c\u5cf0\u547d\u540d\u6cd5\uff1a<\/strong> <code>orderLineItems<\/code><\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f \u9a8c\u8bc1\u7b56\u7565<\/h2>\n<p>\u4e3a\u4e86\u786e\u4fddERD\u4fdd\u6301\u51c6\u786e\u4e14\u53ef\u7528\uff0c\u5728\u5ba1\u67e5\u8fc7\u7a0b\u4e2d\u5e94\u91c7\u53d6\u7279\u5b9a\u7684\u9a8c\u8bc1\u6b65\u9aa4\u3002\u8fd9\u4e9b\u6b65\u9aa4\u6709\u52a9\u4e8e\u5728\u6a21\u5f0f\u9501\u5b9a\u524d\u53d1\u73b0\u6613\u6df7\u6dc6\u7684\u70b9\u3002<\/p>\n<ul>\n<li><strong>\u4e0e\u5229\u76ca\u76f8\u5173\u8005\u5171\u540c\u5ba1\u67e5\uff1a<\/strong> \u4e0e\u4e1a\u52a1\u7528\u6237\u4e00\u8d77\u5ba1\u67e5\u56fe\u8868\uff0c\u786e\u4fdd\u5173\u7cfb\u7b26\u5408\u4ed6\u4eec\u5bf9\u5de5\u4f5c\u6d41\u7a0b\u7684\u5fc3\u7406\u6a21\u578b\u3002<\/li>\n<li><strong>\u7ea6\u675f\u9a8c\u8bc1\uff1a<\/strong> \u68c0\u67e5\u6bcf\u4e2a\u5916\u952e\u662f\u5426\u90fd\u6709\u5bf9\u5e94\u7684\u4e3b\u952e\u5f15\u7528\u3002<\/li>\n<li><strong>\u6570\u636e\u7c7b\u578b\u4e00\u81f4\u6027\uff1a<\/strong> \u786e\u4fdd\u5728\u4e00\u4e2a\u8868\u4e2d\u5b9a\u4e49\u4e3a\u6574\u6570\u7684\u5c5e\u6027\u5728\u53e6\u4e00\u4e2a\u8868\u4e2d\u4e0d\u88ab\u5b9a\u4e49\u4e3a\u5b57\u7b26\u4e32\u3002<\/li>\n<li><strong>\u56fe\u4f8b\u5408\u89c4\u6027\uff1a<\/strong> \u9a8c\u8bc1\u56fe\u8868\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u7b26\u53f7\u662f\u5426\u4e0e\u63d0\u4f9b\u7684\u56fe\u4f8b\u6216\u6807\u51c6\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcdd 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