{"id":1638,"date":"2026-03-23T22:23:22","date_gmt":"2026-03-23T22:23:22","guid":{"rendered":"https:\/\/www.viz-read.com\/cn\/how-to-read-an-erd-like-a-pro\/"},"modified":"2026-03-23T22:23:22","modified_gmt":"2026-03-23T22:23:22","slug":"how-to-read-an-erd-like-a-pro","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/cn\/how-to-read-an-erd-like-a-pro\/","title":{"rendered":"\u5982\u4f55\u50cf\u4e13\u4e1a\u4eba\u58eb\u4e00\u6837\u9605\u8bfbERD\uff1a\u6bcf\u4e2a\u540e\u7aef\u5f00\u53d1\u4eba\u5458\u90fd\u9700\u8981\u638c\u63e1\u7684\u6280\u80fd"},"content":{"rendered":"<p>\u5728\u590d\u6742\u7684\u540e\u7aef\u5de5\u7a0b\u4e16\u754c\u4e2d\uff0c\u6570\u636e\u662f\u6784\u5efa\u5e94\u7528\u7a0b\u5e8f\u7684\u57fa\u7840\u3002\u867d\u7136\u7f16\u5199\u4ee3\u7801\u6765\u64cd\u4f5c\u6570\u636e\u662f\u6838\u5fc3\u804c\u8d23\uff0c\u4f46\u7406\u89e3\u6570\u636e\u672c\u8eab\u7684\u7ed3\u6784\u540c\u6837\u81f3\u5173\u91cd\u8981\u3002\u5b9e\u4f53\u5173\u7cfb\u56fe\uff08ERD\uff09\u6b63\u662f\u8fd9\u79cd\u7ed3\u6784\u7684\u84dd\u56fe\u3002\u5b83\u662f\u4f20\u8fbe\u4fe1\u606f\u5982\u4f55\u5b58\u50a8\u3001\u5173\u8054\u548c\u68c0\u7d22\u7684\u89c6\u89c9\u8bed\u8a00\u3002\u5bf9\u4e8e\u540e\u7aef\u5f00\u53d1\u4eba\u5458\u800c\u8a00\uff0c\u80fd\u591f\u6d41\u5229\u5730\u9605\u8bfbERD\u4e0d\u4ec5\u4ec5\u662f\u4e00\u9879\u52a0\u5206\u6280\u80fd\uff0c\u66f4\u662f\u8bbe\u8ba1\u51fa\u5065\u58ee\u3001\u53ef\u6269\u5c55\u4e14\u53ef\u7ef4\u62a4\u7cfb\u7edf\u7684\u57fa\u672c\u8981\u6c42\u3002<\/p>\n<p>\u8bb8\u591a\u5f00\u53d1\u4eba\u5458\u5728\u672a\u5145\u5206\u7406\u89e3\u6a21\u5f0f\u67b6\u6784\u7684\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u5f00\u59cb\u7f16\u5199\u67e5\u8be2\u3002\u8fd9\u5e38\u5e38\u5bfc\u81f4\u6027\u80fd\u74f6\u9888\u3001\u6570\u636e\u5b8c\u6574\u6027\u95ee\u9898\uff0c\u4ee5\u53ca\u540e\u671f\u96be\u4ee5\u91cd\u6784\u7684\u4efb\u52a1\u3002\u901a\u8fc7\u638c\u63e1\u89e3\u8bfbERD\u7684\u827a\u672f\uff0c\u4f60\u5c06\u5177\u5907\u524d\u77bb\u6027\uff0c\u80fd\u591f\u9884\u5224\u6570\u636e\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u6d41\u52a8\u65b9\u5f0f\uff0c\u4ee5\u53ca\u67d0\u4e00\u533a\u57df\u7684\u53d8\u66f4\u53ef\u80fd\u5982\u4f55\u5f71\u54cd\u6574\u4e2a\u6570\u636e\u5e93\u3002\u672c\u6307\u5357\u6df1\u5165\u63a2\u8ba8\u4e86\u9605\u8bfbERD\u7684\u673a\u5236\uff0c\u4fa7\u91cd\u4e8e\u5b9e\u9645\u5e94\u7528\uff0c\u800c\u975e\u62bd\u8c61\u7406\u8bba\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Marker-style infographic teaching backend developers how to read Entity Relationship Diagrams (ERDs), featuring visual explanations of entities, attributes, relationships, cardinality types (one-to-one, one-to-many, many-to-many), crow's foot notation symbols, primary and foreign keys, normalization concepts, and backend optimization tips in a colorful hand-drawn illustration style\" decoding=\"async\" src=\"https:\/\/www.viz-read.com\/wp-content\/uploads\/2026\/03\/erd-reading-guide-backend-developers-infographic.jpg\"\/><\/figure>\n<\/div>\n<h2>\u7406\u89e3ERD\u7684\u6838\u5fc3\u7ec4\u6210\u90e8\u5206 \ud83e\uddf1<\/h2>\n<p>\u5728\u63a2\u7d22\u8fde\u63a5\u5173\u7cfb\u4e4b\u524d\uff0c\u4f60\u5fc5\u987b\u5148\u7406\u89e3\u6784\u6210\u56fe\u8868\u7684\u5404\u4e2a\u72ec\u7acb\u7b26\u53f7\u3002ERD\u7531\u591a\u4e2a\u4e0d\u540c\u7684\u5143\u7d20\u7ec4\u6210\uff0c\u6bcf\u4e2a\u5143\u7d20\u4ee3\u8868\u6570\u636e\u6a21\u578b\u7684\u7279\u5b9a\u65b9\u9762\u3002\u80fd\u591f\u8fc5\u901f\u8bc6\u522b\u8fd9\u4e9b\u5143\u7d20\uff0c\u5c31\u80fd\u8ba9\u4f60\u5728\u590d\u6742\u7684\u6a21\u5f0f\u4e2d\u6e38\u5203\u6709\u4f59\uff0c\u4e0d\u4f1a\u8ff7\u5931\u5728\u9519\u7efc\u7684\u7ebf\u6761\u4e2d\u3002<\/p>\n<h3>1. \u5b9e\u4f53\uff08\u8868\uff09<\/h3>\n<p>ERD\u4e2d\u6700\u663e\u8457\u7684\u7279\u5f81\u662f\u5b9e\u4f53\u3002\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u8bed\u5883\u4e2d\uff0c\u5b9e\u4f53\u76f4\u63a5\u5bf9\u5e94\u4e00\u5f20\u8868\u3002\u5b83\u4ee3\u8868\u4e00\u4e2a\u72ec\u7acb\u7684\u5bf9\u8c61\u6216\u6982\u5ff5\uff0c\u6570\u636e\u6b63\u662f\u56f4\u7ed5\u8fd9\u4e2a\u5bf9\u8c61\u6216\u6982\u5ff5\u8fdb\u884c\u5b58\u50a8\u7684\u3002\u5f53\u4f60\u770b\u5230\u4e00\u4e2a\u6807\u6709\u540d\u79f0\u7684\u77e9\u5f62\uff0c\u6bd4\u5982<strong>\u5ba2\u6237<\/strong>\u6216<strong>\u8ba2\u5355<\/strong>\u65f6\uff0c\u4f60\u770b\u5230\u7684\u5c31\u662f\u4e00\u5f20\u8868\u3002<\/p>\n<ul>\n<li><strong>\u89c6\u89c9\u6807\u8bc6\uff1a<\/strong> \u901a\u5e38\u662f\u4e00\u4e2a\u5305\u542b\u540d\u79f0\u7684\u77e9\u5f62\u6216\u65b9\u6846\u3002<\/li>\n<li><strong> \u529f\u80fd\uff1a<\/strong> \u5c06\u76f8\u5173\u7684\u6570\u636e\u5c5e\u6027\u5f52\u4e3a\u4e00\u7ec4\u3002<\/li>\n<li><strong> 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\u5c5e\u6027\uff08\u5217\uff09<\/h3>\n<p>\u5c5e\u6027\u5b9a\u4e49\u4e86\u5b9e\u4f53\u7684\u7279\u6027\u3002\u5982\u679c\u5b9e\u4f53\u662f\u4e00\u5f20\u8868\uff0c\u90a3\u4e48\u5c5e\u6027\u5c31\u662f\u8be5\u8868\u4e2d\u7684\u5217\u3002\u5b83\u4eec\u63cf\u8ff0\u4e86\u6bcf\u4e2a\u8bb0\u5f55\u6240\u9700\u7684\u7279\u5b9a\u6570\u636e\u70b9\u3002<\/p>\n<ul>\n<li><strong>\u4e3b\u952e\uff1a<\/strong> \u901a\u5e38\u7528\u4e0b\u5212\u7ebf\u6216\u94a5\u5319\u56fe\u6807\u6807\u8bb0\u3002\u5b83\u552f\u4e00\u5730\u6807\u8bc6\u6bcf\u4e00\u884c\u3002<\/li>\n<li><strong> \u5916\u952e\uff1a<\/strong> \u901a\u5e38\u901a\u8fc7\u4e00\u6761\u8fde\u63a5\u5230\u53e6\u4e00\u4e2a\u5b9e\u4f53\u7684\u7ebf\u6765\u8868\u793a\u3002\u5b83\u5efa\u7acb\u4e86\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/li>\n<li><strong>\u6570\u636e\u7c7b\u578b\uff1a<\/strong> \u867d\u7136\u5e76\u4e0d\u603b\u662f\u4ee5\u89c6\u89c9\u65b9\u5f0f\u663e\u793a\uff0c\u4f46\u7ecf\u9a8c\u4e30\u5bcc\u7684\u8bfb\u8005\u4f1a\u6839\u636e\u4e0a\u4e0b\u6587\u63a8\u65ad\u6570\u636e\u7c7b\u578b\uff08\u4f8b\u5982\uff0c\u540d\u4e3a<em>email_address<\/em>\u7684\u5b57\u6bb5\u6697\u793a\u4e3a\u5b57\u7b26\u4e32\uff0c<em>created_at<\/em>\u7684\u5b57\u6bb5\u6697\u793a\u4e3a\u65f6\u95f4\u6233\uff09\u3002<\/li>\n<\/ul>\n<p>\u7406\u89e3\u5c5e\u6027\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u67e5\u8be2\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u5c5e\u6027\u672a\u88ab\u7d22\u5f15\uff0c\u641c\u7d22\u5b83\u5c06\u89e6\u53d1\u5168\u8868\u626b\u63cf\u3002\u5982\u679c\u662f\u5916\u952e\uff0c\u5219\u51b3\u5b9a\u4e86\u8fde\u63a5\u64cd\u4f5c\u3002<\/p>\n<h3>3. 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\ud83d\udd17<\/h2>\n<p>\u57fa\u6570\u662fERD\u7684\u6838\u5fc3\u3002\u5b83\u51b3\u5b9a\u4e86\u6570\u636e\u5e93\u5173\u7cfb\u7684\u7ea6\u675f\u548c\u903b\u8f91\u3002\u8bef\u89e3\u57fa\u6570\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u91cd\u590d\u6216\u5b64\u7acb\u8bb0\u5f55\u3002\u8ba9\u6211\u4eec\u6765\u5206\u89e3\u4f60\u5c06\u9047\u5230\u7684\u4e09\u79cd\u4e3b\u8981\u5173\u7cfb\u7c7b\u578b\u3002<\/p>\n<h3>1. \u4e00\u5bf9\u4e00\uff081:1\uff09<\/h3>\n<p>\u5f53\u8868A\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u4e0e\u8868B\u4e2d\u7684\u5355\u6761\u8bb0\u5f55\u4e00\u4e00\u5bf9\u5e94\uff0c\u53cd\u4e4b\u4ea6\u7136\u65f6\uff0c\u8fd9\u79cd\u5173\u7cfb\u5c31\u5b58\u5728\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u573a\u666f\uff1a<\/strong>\u4e3a\u4e86\u5b89\u5168\u6216\u6027\u80fd\u5c06\u5927\u8868\u62c6\u5206\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a<em>\u7528\u6237<\/em>\u8d44\u6599\u53ef\u80fd\u4e0e\u4e00\u4e2a<em>\u7528\u6237\u8bbe\u7f6e<\/em>\u8868\u5206\u5f00\u3002<\/li>\n<li><strong>\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/strong>\u4e00\u4e2a\u8868\u4e2d\u7684\u5916\u952e\u5f15\u7528\u53e6\u4e00\u4e2a\u8868\u7684\u4e3b\u952e\uff0c\u901a\u5e38\u8fd8\u5e26\u6709\u552f\u4e00\u6027\u7ea6\u675f\u3002<\/li>\n<li><strong>\u540e\u7aef\u5f71\u54cd\uff1a<\/strong>\u901a\u5e38\u9700\u8981\u8fde\u63a5\u64cd\u4f5c\u6765\u83b7\u53d6\u5b8c\u6574\u6570\u636e\uff0c\u4f46\u903b\u8f91\u5f88\u7b80\u5355\u3002<\/li>\n<\/ul>\n<h3>2. 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\u83b7\u53d6\u5206\u7c7b\u65f6\uff0c\u901a\u5e38\u4f1a\u52a0\u8f7d\u4e00\u4e2a\u4ea7\u54c1\u5217\u8868\u3002\u83b7\u53d6\u4ea7\u54c1\u65f6\uff0c\u4f1a\u52a0\u8f7d\u5355\u4e2a\u5206\u7c7b\u3002<\/li>\n<\/ul>\n<h3>3. \u591a\u5bf9\u591a\uff08M:N\uff09<\/h3>\n<p>\u5f53\u8868A\u4e2d\u7684\u8bb0\u5f55\u53ef\u4ee5\u4e0e\u8868B\u4e2d\u7684\u591a\u4e2a\u8bb0\u5f55\u5173\u8054\uff0c\u540c\u65f6\u8868B\u4e2d\u7684\u8bb0\u5f55\u4e5f\u53ef\u4ee5\u4e0e\u8868A\u4e2d\u7684\u591a\u4e2a\u8bb0\u5f55\u5173\u8054\u65f6\uff0c\u5c31\u4f1a\u51fa\u73b0\u8fd9\u79cd\u5173\u7cfb\u3002<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u573a\u666f\uff1a<\/strong> \u5b66\u751f\u9009\u4fee\u591a\u95e8\u8bfe\u7a0b\uff0c\u800c\u6bcf\u95e8\u8bfe\u7a0b\u53c8\u5305\u542b\u591a\u540d\u5b66\u751f\u3002<\/li>\n<li><strong>\u5b9e\u73b0\uff1a<\/strong> \u8fd9\u65e0\u6cd5\u901a\u8fc7\u5355\u4e00\u5916\u952e\u76f4\u63a5\u8868\u793a\u3002\u5b83\u9700\u8981\u4e00\u4e2a\u8fde\u63a5\u8868\uff08\u6216\u6865\u63a5\u8868\uff09\u5c06\u5173\u7cfb\u5206\u89e3\u4e3a\u4e24\u4e2a\u4e00\u5bf9\u591a\u5173\u7cfb\u3002<\/li>\n<li><strong>\u540e\u7aef\u5f71\u54cd\uff1a<\/strong> \u67e5\u8be2\u901a\u5e38\u6d89\u53ca\u4e09\u5f20\u8868\u3002\u60a8\u5fc5\u987b\u5728\u4ee3\u7801\u4e2d\u663e\u5f0f\u5904\u7406\u8fde\u63a5\u8868\u4ee5\u7ba1\u7406\u5173\u8054\u5173\u7cfb\u3002<\/li>\n<\/ul>\n<h4>\u8868\uff1a\u5173\u7cfb\u57fa\u6570\u603b\u7ed3<\/h4>\n<table>\n<thead>\n<tr>\n<th>\u5173\u7cfb\u7c7b\u578b<\/th>\n<th>\u793a\u4f8b\u573a\u666f<\/th>\n<th>\u5b9e\u73b0\u7b56\u7565<\/th>\n<th>\u67e5\u8be2\u590d\u6742\u5ea6<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u4e00\u5bf9\u4e00\uff081:1\uff09<\/td>\n<td>\u7528\u6237\u4e0e\u4e2a\u4eba\u8d44\u6599<\/td>\n<td>\u552f\u4e00\u5916\u952e<\/td>\n<td>\u4f4e\uff08\u5355\u6b21\u8fde\u63a5\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u4e00\u5bf9\u591a\uff081:N\uff09<\/td>\n<td>\u4f5c\u8005\u4e0e\u4e66\u7c4d<\/td>\n<td>\u5916\u952e\u4f4d\u4e8e\u591a\u7684\u4e00\u65b9<\/td>\n<td>\u4e2d\u7b49\uff08\u5217\u8868\u8fde\u63a5\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u5bf9\u591a\uff08M:N\uff09<\/td>\n<td>\u5b66\u751f\u4e0e\u8bfe\u7a0b<\/td>\n<td>\u8fde\u63a5\u8868<\/td>\n<td>\u9ad8\uff08\u4e09\u8868\u8fde\u63a5\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u7b26\u53f7\u6837\u5f0f\u548c\u7b26\u53f7 \ud83d\udcd0<\/h2>\n<p>\u867d\u7136\u6982\u5ff5\u4fdd\u6301\u4e00\u81f4\uff0c\u4f46\u89c6\u89c9\u7b26\u53f7\u53ef\u80fd\u56e0\u8bbe\u8ba1\u8005\u4e0d\u540c\u800c\u6709\u6240\u5dee\u5f02\u3002\u719f\u6089\u5e38\u89c1\u6837\u5f0f\u53ef\u786e\u4fdd\u4f60\u4e0d\u4f1a\u9057\u6f0f\u7ec6\u5fae\u4e4b\u5904\u3002<\/p>\n<h3>Crow\u2019s Foot \u7b26\u53f7\u8868\u793a\u6cd5<\/h3>\n<p>\u8fd9\u79cd\u8868\u793a\u6cd5\u5728\u73b0\u4ee3\u6570\u636e\u5e93\u8bbe\u8ba1\u5de5\u5177\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002\u5b83\u5728\u5173\u7cfb\u7ebf\u672b\u7aef\u4f7f\u7528\u7279\u5b9a\u7b26\u53f7\u6765\u8868\u793a\u57fa\u6570\u3002<\/p>\n<ul>\n<li><strong>\u5355\u7ebf\uff1a<\/strong> \u8868\u793a\u201c\u4e00\u201d\u3002<\/li>\n<li><strong> \u9e1f\u722a\uff08\u4e09\u652f\uff09\uff1a<\/strong> \u8868\u793a\u201c\u591a\u201d\u3002<\/li>\n<li><strong> \u5706\u5708\uff1a<\/strong> \u8868\u793a\u201c\u53ef\u9009\u201d\uff08\u96f6\uff09\u3002<\/li>\n<li><strong> \u7ad6\u7ebf\uff1a<\/strong> \u8868\u793a\u201c\u5fc5\u9009\u201d\uff08\u4e00\uff09\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4e00\u7aef\u4e3a\u5355\u7ad6\u7ebf\u3001\u53e6\u4e00\u7aef\u4e3a\u9e1f\u722a\u7684\u8fde\u7ebf\u8868\u793a\u4e00\u5bf9\u591a\u5173\u7cfb\uff0c\u5176\u4e2d\u201c\u4e00\u201d\u7aef\u4e3a\u5fc5\u9009\u3002<\/p>\n<h3>\u9648\u6c0f\u8868\u793a\u6cd5<\/h3>\n<p>\u5728\u5e94\u7528\u5f00\u53d1\u4e2d\u8f83\u5c11\u89c1\uff0c\u4f46\u5728\u5b66\u672f\u6216\u9ad8\u5c42\u67b6\u6784\u573a\u666f\u4e2d\u8f83\u4e3a\u5e38\u89c1\u3002\u5b83\u4f7f\u7528\u83f1\u5f62\u6765\u8868\u793a\u5173\u7cfb\uff0c\u800c\u975e\u7ebf\u6761\u3002<\/p>\n<ul>\n<li><strong>\u5b9e\u4f53\uff1a<\/strong>\u77e9\u5f62\u3002<\/li>\n<li><strong>\u5173\u7cfb\uff1a<\/strong>\u83f1\u5f62\u3002<\/li>\n<li><strong>\u5c5e\u6027\uff1a<\/strong>\u692d\u5706\u3002<\/li>\n<\/ul>\n<p>\u9605\u8bfb\u9648\u6c0f\u8868\u793a\u6cd5\u65f6\uff0c\u5e94\u91cd\u70b9\u5173\u6ce8\u83f1\u5f62\u5f62\u72b6\u3002\u57fa\u6570\u6807\u7b7e\uff081\u3001N\u3001M\uff09\u4f4d\u4e8e\u8fde\u63a5\u83f1\u5f62\u4e0e\u5b9e\u4f53\u7684\u7ebf\u6bb5\u4e0a\u3002<\/p>\n<h2>\u952e\u4e0e\u7ea6\u675f\uff1a\u6e38\u620f\u7684\u89c4\u5219 \ud83d\udd11<\/h2>\n<p>ERD \u4e0d\u4ec5\u6d89\u53ca\u8fde\u63a5\uff0c\u66f4\u5173\u4e4e\u89c4\u5219\u3002\u7ea6\u675f\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002\u4f5c\u4e3a\u540e\u7aef\u5f00\u53d1\u4eba\u5458\uff0c\u4f60\u9700\u8981\u4e86\u89e3\u54ea\u4e9b\u7ea6\u675f\u7531\u6570\u636e\u5e93\u5f3a\u5236\u6267\u884c\uff0c\u54ea\u4e9b\u5fc5\u987b\u5728\u5e94\u7528\u903b\u8f91\u4e2d\u5904\u7406\u3002<\/p>\n<h3>\u4e3b\u952e\uff08PK\uff09<\/h3>\n<p>\u6bcf\u4e2a\u8868\u90fd\u5e94\u6709\u4e00\u4e2a\u4e3b\u952e\u3002\u8be5\u503c\u552f\u4e00\u6807\u8bc6\u6bcf\u4e00\u884c\u3002\u9605\u8bfb ERD \u65f6\uff0c\u5e94\u5bfb\u627e\u5e26\u4e0b\u5212\u7ebf\u7684\u5c5e\u6027\u3002<\/p>\n<ul>\n<li><strong>\u4ee3\u7406\u952e\uff1a<\/strong>\u81ea\u589e\u6574\u6570\uff08\u5982 ID\uff09\uff0c\u65e0\u4e1a\u52a1\u542b\u4e49\u3002<\/li>\n<li><strong>\u81ea\u7136\u952e\uff1a<\/strong>\u5929\u7136\u552f\u4e00\u7684\u4e1a\u52a1\u6807\u8bc6\u7b26\uff08\u5982\u90ae\u7bb1\u3001SKU\uff09\u3002<\/li>\n<\/ul>\n<p><strong>\u4e3a\u4ec0\u4e48\u8fd9\u5f88\u91cd\u8981\uff1a<\/strong>\u5916\u952e\u5f15\u7528\u4e3b\u952e\u3002\u5982\u679c\u4f60\u66f4\u6539\u4e3b\u952e\u7b56\u7565\uff08\u4f8b\u5982 UUID \u4e0e\u6574\u6570\uff09\uff0c\u5219\u5fc5\u987b\u66f4\u65b0\u6240\u6709\u76f8\u5173\u7684\u5916\u952e\uff0c\u5e76\u53ef\u80fd\u9700\u8981\u91cd\u6784\u5e94\u7528\u7a0b\u5e8f\u7684\u7f13\u5b58\u5c42\u3002<\/p>\n<h3>\u5916\u952e\uff08FK\uff09<\/h3>\n<p>\u5916\u952e\u662f\u8868\u4e2d\u4e00\u4e2a\u5b57\u6bb5\uff08\u6216\u4e00\u7ec4\u5b57\u6bb5\uff09\uff0c\u5b83\u5f15\u7528\u53e6\u4e00\u4e2a\u8868\u7684\u4e3b\u952e\u3002\u5b83\u5f3a\u5236\u5b9e\u65bd\u5f15\u7528\u5b8c\u6574\u6027\u3002<\/p>\n<ul>\n<li><strong>\u5220\u9664\u65f6\u7ea7\u8054\uff1a<\/strong> \u5982\u679c\u7236\u8bb0\u5f55\u88ab\u5220\u9664\uff0c\u5b50\u8bb0\u5f55\u5c06\u81ea\u52a8\u5220\u9664\u3002<\/li>\n<li><strong>\u5220\u9664\u65f6\u9650\u5236\uff1a<\/strong> \u5982\u679c\u5b58\u5728\u5b50\u8bb0\u5f55\uff0c\u5219\u963b\u6b62\u7236\u8bb0\u5f55\u7684\u5220\u9664\u3002<\/li>\n<li><strong>\u5220\u9664\u65f6\u8bbe\u4e3a\u7a7a\uff1a<\/strong> \u5982\u679c\u7236\u8bb0\u5f55\u88ab\u5220\u9664\uff0c\u5219\u5c06\u5916\u952e\u5217\u8bbe\u7f6e\u4e3a NULL\u3002<\/li>\n<\/ul>\n<p> \u7406\u89e3\u8fd9\u4e9b\u884c\u4e3a\u5728\u7f16\u5199\u5220\u9664\u7aef\u70b9\u65f6\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u5173\u7cfb\u56fe\u590d\u6742\uff0c\u7ea7\u8054\u5220\u9664\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u5916\u7684\u526f\u4f5c\u7528\u3002<\/p>\n<h2>\u89c4\u8303\u5316\u4e0e\u6570\u636e\u7ed3\u6784 \ud83e\uddf9<\/h2>\n<p>\u5728\u5206\u6790ERD\u65f6\uff0c\u4f60\u8fd8\u5e94\u8bc4\u4f30\u89c4\u8303\u5316\u7684\u7a0b\u5ea6\u3002\u89c4\u8303\u5316\u51cf\u5c11\u4e86\u6570\u636e\u5197\u4f59\u5e76\u63d0\u9ad8\u4e86\u5b8c\u6574\u6027\u3002\u7136\u800c\uff0c\u5b83\u5e76\u4e0d\u603b\u662f\u6027\u80fd\u7684\u4e25\u683c\u8981\u6c42\u3002<\/p>\n<h3>\u7b2c\u4e00\u8303\u5f0f\uff081NF\uff09<\/h3>\n<p>\u6240\u6709\u5217\u5fc5\u987b\u5305\u542b\u539f\u5b50\u503c\u3002\u5355\u4e2a\u5355\u5143\u683c\u4e2d\u4e0d\u80fd\u5305\u542b\u5217\u8868\u6216\u6570\u7ec4\u3002\u5982\u679c\u4f60\u770b\u5230\u4e00\u4e2a\u540d\u4e3a<em>\u6807\u7b7e<\/em>\u5305\u542b<em>\u201c\u6807\u7b7e1, \u6807\u7b7e2, \u6807\u7b7e3\u201d<\/em>\uff0c\u5219\u8be5\u6a21\u5f0f\u8fdd\u53cd\u4e861NF\u3002<\/p>\n<h3>\u7b2c\u4e8c\u8303\u5f0f\uff082NF\uff09<\/h3>\n<p>\u5fc5\u987b\u6ee1\u8db31NF\uff0c\u4e14\u6240\u6709\u975e\u952e\u5c5e\u6027\u5fc5\u987b\u5b8c\u5168\u4f9d\u8d56\u4e8e\u4e3b\u952e\u3002\u8fd9\u901a\u5e38\u6d89\u53ca\u5c06\u4ec5\u4f9d\u8d56\u4e8e\u590d\u5408\u952e\u90e8\u5206\u7684\u5c5e\u6027\u79fb\u81f3\u5355\u72ec\u7684\u8868\u4e2d\u3002<\/p>\n<h3>\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09<\/h3>\n<p>\u5fc5\u987b\u6ee1\u8db32NF\uff0c\u4e14\u4e0d\u5b58\u5728\u4f20\u9012\u4f9d\u8d56\u3002\u5982\u679c<em>A<\/em>\u51b3\u5b9a<em>B<\/em>\uff0c\u4e14<em>B<\/em>\u51b3\u5b9a<em>C<\/em>\uff0c\u7136\u540e<em>A<\/em>\u51b3\u5b9a<em>C<\/em>\u3002\u5728\u7b2c\u4e09\u8303\u5f0f\u4e2d\uff0c<em>C<\/em>\u4e0d\u5e94\u4e0e<em>B<\/em>.<\/p>\n<h4>\u5b9e\u8df5\u4e2d\u7684\u53cd\u89c4\u8303\u5316<\/h4>\n<p>\u867d\u7136\u89c4\u8303\u5316\u662f\u7406\u8bba\u4e0a\u7684\u7406\u60f3\u72b6\u6001\uff0c\u4f46\u540e\u7aef\u5f00\u53d1\u901a\u5e38\u4e3a\u4e86\u6027\u80fd\u9700\u8981\u8fdb\u884c\u53cd\u89c4\u8303\u5316\u3002\u4f60\u53ef\u80fd\u4f1a\u5728\u4e3a\u901f\u5ea6\u8bbe\u8ba1\u7684ERD\u4e2d\u770b\u5230\u91cd\u590d\u6570\u636e\u3002<\/p>\n<ul>\n<li><strong>\u8bfb\u53d6\u4e0e\u5199\u5165\uff1a<\/strong>\u89c4\u8303\u5316\u6a21\u5f0f\u66f4\u9002\u5408\u5199\u5165\uff1b\u53cd\u89c4\u8303\u5316\u6a21\u5f0f\u66f4\u9002\u5408\u8bfb\u53d6\u3002<\/li>\n<li><strong>\u7f13\u5b58\uff1a<\/strong>\u6709\u65f6\u4f1a\u590d\u5236\u6570\u636e\uff0c\u4ee5\u51cf\u5c11\u9ad8\u6d41\u91cf\u7aef\u70b9\u4e2d\u7684JOIN\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u5f53\u4f60\u5728ERD\u4e2d\u770b\u5230\u5197\u4f59\u6570\u636e\u65f6\uff0c\u8981\u8d28\u7591\u5176\u539f\u56e0\u3002\u8fd9\u662f\u8bbe\u8ba1\u7f3a\u9677\uff0c\u8fd8\u662f\u4e00\u79cd\u523b\u610f\u7684\u4f18\u5316\u7b56\u7565\uff1f<\/p>\n<h2>\u9605\u8bfbERD\u4ee5\u4f18\u5316\u540e\u7aef \ud83d\ude80<\/h2>\n<p>\u9605\u8bfbERD\u4e0d\u4ec5\u4ec5\u662f\u7406\u89e3\u6570\u636e\u5b58\u50a8\uff1b\u66f4\u5728\u4e8e\u9884\u89c1\u6027\u80fd\u3002\u4e00\u4e2a\u7406\u89e3\u900f\u5f7b\u7684\u6a21\u5f0f\u80fd\u8ba9\u4f60\u7f16\u5199\u51fa\u80fd\u6709\u6548\u5229\u7528\u7d22\u5f15\u7684\u67e5\u8be2\u3002<\/p>\n<h3>\u8bc6\u522b\u7d22\u5f15\u673a\u4f1a<\/h3>\n<p>\u5bfb\u627e\u5728\u641c\u7d22\u8fc7\u6ee4\u5668\u6216\u6392\u5e8f\u64cd\u4f5c\u4e2d\u9891\u7e41\u4f7f\u7528\u7684\u5c5e\u6027\u3002\u8fd9\u4e9b\u5c5e\u6027\u5e94\u8be5\u88ab\u7d22\u5f15\u3002<\/p>\n<ul>\n<li><strong>\u641c\u7d22\u5217\uff1a<\/strong>\u5728WHERE\u5b50\u53e5\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u3002<\/li>\n<li><strong>\u8fde\u63a5\u5217\uff1a<\/strong>\u5916\u952e\u51e0\u4e4e\u603b\u662f\u5e94\u8be5\u88ab\u7d22\u5f15\uff0c\u4ee5\u52a0\u5febJOIN\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u6392\u5e8f\u5217\uff1a<\/strong>\u5728ORDER BY\u5b50\u53e5\u4e2d\u4f7f\u7528\u7684\u5c5e\u6027\u3002<\/li>\n<\/ul>\n<h3>\u907f\u514dN+1\u67e5\u8be2<\/h3>\n<p>ERD\u63ed\u793a\u4e86\u5173\u7cfb\u7ed3\u6784\u3002\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u5148\u83b7\u53d6\u7236\u7ea7\uff0c\u518d\u5faa\u73af\u83b7\u53d6\u6bcf\u4e2a\u5b50\u9879\uff0c\u5c31\u4f1a\u4ea7\u751fN+1\u67e5\u8be2\u95ee\u9898\u3002<\/p>\n<ul>\n<li><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong>\u6839\u636eERD\u4e2d\u5b9a\u4e49\u7684\u5173\u7cfb\u8def\u5f84\uff0c\u4f7f\u7528\u9884\u52a0\u8f7d\u6216\u663e\u5f0fJOIN\u3002<\/li>\n<li><strong>\u8b66\u544a\uff1a<\/strong> \u5982\u679c\u5173\u8054\u8868\u5728\u4e24\u4e2a\u5916\u952e\u5217\u4e0a\u90fd\u6ca1\u6709\u5efa\u7acb\u7d22\u5f15\uff0c\u590d\u6742\u7684\u591a\u5bf9\u591a\u5173\u7cfb\u5f88\u5bb9\u6613\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h2>\u6a21\u5f0f\u8bbe\u8ba1\u4e2d\u7684\u5e38\u89c1\u9677\u9631 \u26a0\ufe0f<\/h2>\n<p>\u5373\u4f7f\u7ecf\u9a8c\u4e30\u5bcc\u7684\u67b6\u6784\u5e08\u4e5f\u4f1a\u72af\u9519\u3002\u9605\u8bfbERD\u65f6\uff0c\u8981\u7559\u610f\u90a3\u4e9b\u53ef\u80fd\u5728\u672a\u6765\u5f15\u53d1\u95ee\u9898\u7684\u7cdf\u7cd5\u8bbe\u8ba1\u8ff9\u8c61\u3002<\/p>\n<h3>1. \u5faa\u73af\u4f9d\u8d56<\/h3>\n<p>\u5f53\u5b9e\u4f53A\u4f9d\u8d56\u4e8e\u5b9e\u4f53B\uff0c\u800c\u5b9e\u4f53B\u53c8\u4f9d\u8d56\u4e8e\u5b9e\u4f53A\u65f6\uff0c\u5c31\u4f1a\u5f62\u6210\u5faa\u73af\u4f9d\u8d56\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e8b\u52a1\u63d0\u4ea4\u65f6\u53d1\u751f\u6b7b\u9501\uff0c\u6216\u4ea7\u751f\u590d\u6742\u7684\u521d\u59cb\u5316\u903b\u8f91\u3002<\/p>\n<h3>2. \u4e0d\u5e73\u8861\u7684\u57fa\u6570<\/h3>\n<p>\u6709\u65f6\uff0c\u591a\u5bf9\u591a\u5173\u7cfb\u88ab\u9519\u8bef\u5730\u5efa\u6a21\u4e3a\u53cc\u5411\u7684\u4e00\u5bf9\u591a\u5173\u7cfb\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u6570\u636e\u91cd\u590d\u6216\u4fe1\u606f\u4e22\u5931\u3002<\/p>\n<h3>3. \u7f3a\u5c11\u5143\u6570\u636e<\/h3>\n<p>\u4e00\u4e2a\u7f3a\u5c11\u65f6\u95f4\u6233\uff08created_at\u3001updated_at\uff09\u7684ERD\u4f1a\u4f7f\u5ba1\u8ba1\u548c\u8c03\u8bd5\u53d8\u5f97\u56f0\u96be\u3002\u540e\u7aef\u7cfb\u7edf\u901a\u5e38\u9700\u8981\u8fd9\u4e9b\u6570\u636e\u6765\u652f\u6301\u8f6f\u5220\u9664\u6216\u7248\u672c\u63a7\u5236\u3002<\/p>\n<h3>4. \u8fc7\u5ea6\u89c4\u8303\u5316<\/h3>\n<p>\u8868\u7684\u6570\u91cf\u8fc7\u591a\u4f1a\u4f7f\u7b80\u5355\u7684\u67e5\u8be2\u9700\u8981\u8fc7\u591a\u7684\u8fde\u63a5\u64cd\u4f5c\uff0c\u4ece\u800c\u62d6\u6162\u5e94\u7528\u7a0b\u5e8f\u3002\u5982\u679c\u67d0\u4e9b\u8868\u5177\u6709\u76f8\u540c\u7684\u751f\u547d\u671f\uff0c\u5e94\u8003\u8651\u662f\u5426\u53ef\u4ee5\u903b\u8f91\u4e0a\u5408\u5e76\u5b83\u4eec\u3002<\/p>\n<h2>\u5b9e\u9645\u5e94\u7528\uff1a\u4ece\u56fe\u8868\u5230\u4ee3\u7801 \ud83d\udcbb<\/h2>\n<p>\u7406\u89e3ERD\u4e4b\u540e\uff0c\u4e0b\u4e00\u6b65\u5c31\u662f\u5c06\u5176\u8f6c\u5316\u4e3a\u5e94\u7528\u903b\u8f91\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u5305\u62ec\u5c06\u53ef\u89c6\u5316\u6a21\u578b\u6620\u5c04\u5230\u4f60\u7684\u4ee3\u7801\u5e93\u4e2d\u3002<\/p>\n<h3>1. \u6a21\u578b\u6620\u5c04<\/h3>\n<p>\u6bcf\u4e2a\u5b9e\u4f53\u5728\u4ee3\u7801\u4e2d\u90fd\u53d8\u6210\u4e00\u4e2a\u7c7b\u6216\u6a21\u578b\u3002\u5c5e\u6027\u53d8\u6210\u5c5e\u6027\u3002\u5173\u7cfb\u53d8\u6210\u5173\u8054\u6216\u65b9\u6cd5\u3002<\/p>\n<ul>\n<li><strong>\u4e00\u5bf9\u4e00\uff1a<\/strong> \u5355\u4e2a\u5bf9\u8c61\u5c5e\u6027\u3002<\/li>\n<li><strong>\u4e00\u5bf9\u591a\uff1a<\/strong> \u96c6\u5408\u6216\u5217\u8868\u5c5e\u6027\u3002<\/li>\n<li><strong>\u591a\u5bf9\u591a\uff1a<\/strong> \u901a\u8fc7\u6865\u6881\u5173\u8054\u7684\u591a\u4e2a\u76f8\u5173\u6a21\u578b\u96c6\u5408\u3002<\/li>\n<\/ul>\n<h3>2. API\u8bbe\u8ba1<\/h3>\n<p>ERD\u51b3\u5b9a\u4e86\u4f60\u7684API\u7ed3\u6784\u3002\u4e00\u4e2a\u89c4\u8303\u5316\u7684\u6a21\u5f0f\u901a\u5e38\u4f1a\u5bfc\u81f4\u5d4c\u5957\u7684JSON\u54cd\u5e94\uff0c\u6216\u4e3a\u76f8\u5173\u8d44\u6e90\u8bbe\u7f6e\u72ec\u7acb\u7684\u7aef\u70b9\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a<code>\/orders<\/code>\u7aef\u70b9\u53ef\u80fd\u5305\u542b\u4e00\u4e2a<code>\/order-items<\/code> \u5d4c\u5957\u7ed3\u6784\u3002<\/p>\n<h3>3. \u9a8c\u8bc1\u903b\u8f91<\/h3>\n<p>ERD\u4e2d\u7684\u7ea6\u675f\uff08\u5982NOT NULL\uff09\u5e94\u5728\u5e94\u7528\u5c42\u9a8c\u8bc1\u4e2d\u4f53\u73b0\u3002\u5982\u679c\u6570\u636e\u5e93\u5141\u8bb8\u7a7a\u503c\uff0c\u4f46\u4f60\u7684\u4e1a\u52a1\u903b\u8f91\u8981\u6c42\u5fc5\u987b\u6709\u503c\uff0c\u90a3\u4e48\u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u5728\u5c06\u6570\u636e\u53d1\u9001\u5230\u6570\u636e\u5e93\u4e4b\u524d\u5f3a\u5236\u6267\u884c\u8be5\u89c4\u5219\u3002<\/p>\n<h2>\u968f\u7740\u65f6\u95f4\u4fdd\u6301\u6a21\u5f0f\u5b8c\u6574\u6027 \ud83d\udd27<\/h2>\n<p>ERD \u4e0d\u662f\u9759\u6001\u7684\u3002\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u7684\u6f14\u8fdb\uff0c\u6a21\u5f0f\u4e5f\u4f1a\u53d1\u751f\u53d8\u5316\u3002\u80fd\u591f\u8bfb\u61c2 ERD \u6709\u52a9\u4e8e\u4f60\u6709\u6548\u5730\u7ba1\u7406\u8fc1\u79fb\u3002<\/p>\n<h3>1. \u5904\u7406\u8fc1\u79fb<\/h3>\n<p>\u6dfb\u52a0\u65b0\u8868\u6216\u5173\u7cfb\u65f6\uff0c\u5e94\u7acb\u5373\u66f4\u65b0 ERD\u3002\u8fd9\u80fd\u786e\u4fdd\u56e2\u961f\u5bf9\u7cfb\u7edf\u6709\u6700\u65b0\u7684\u89c6\u56fe\u3002\u8fc1\u79fb\u64cd\u4f5c\u5e94\u8fdb\u884c\u7248\u672c\u63a7\u5236\uff0c\u5e76\u5728\u5f53\u524d\u7684\u6a21\u5f0f\u7ed3\u6784\u4e0a\u8fdb\u884c\u6d4b\u8bd5\u3002<\/p>\n<h3>2. \u91cd\u6784<\/h3>\n<p>\u91cd\u6784\u901a\u5e38\u6d89\u53ca\u62c6\u5206\u8868\u6216\u5408\u5e76\u8868\u3002\u7406\u89e3\u5173\u7cfb\u7ebf\u6709\u52a9\u4e8e\u4f60\u5224\u65ad\u54ea\u4e9b\u6570\u636e\u9700\u8981\u79fb\u52a8\uff0c\u54ea\u4e9b\u5916\u952e\u9700\u8981\u66f4\u65b0\u3002<\/p>\n<h3>3. \u6587\u6863<\/h3>\n<p>ERD \u662f\u4e00\u4e2a\u52a8\u6001\u6587\u6863\u3002\u5982\u679c\u56fe\u8868\u4e0e\u6570\u636e\u5e93\u4e0d\u4e00\u81f4\uff0c\u5b83\u5c31\u6beb\u65e0\u7528\u5904\u3002\u5b9a\u671f\u5ba1\u67e5\u53ef\u786e\u4fdd\u89c6\u89c9\u5448\u73b0\u4e0e\u5b9e\u9645\u7269\u7406\u7ed3\u6784\u4e00\u81f4\u3002<\/p>\n<h2>\u9ad8\u7ea7\u6982\u5ff5\uff1a\u9012\u5f52\u5173\u7cfb \ud83d\udd01<\/h2>\n<p>\u6709\u65f6\uff0c\u4e00\u4e2a\u5b9e\u4f53\u4f1a\u4e0e\u81ea\u8eab\u76f8\u5173\u8054\u3002\u8fd9\u88ab\u79f0\u4e3a\u9012\u5f52\u5173\u7cfb\u3002<\/p>\n<ul>\n<li><strong>\u793a\u4f8b\uff1a<\/strong> \u4e00\u4e2a <em>\u5458\u5de5<\/em>\u5b9e\u4f53\uff0c\u5176\u4e2d\u4e00\u540d\u5458\u5de5\u662f\u5176\u4ed6\u5458\u5de5\u7684\u7ba1\u7406\u8005\u3002<\/li>\n<li><strong>\u5b9e\u73b0\uff1a<\/strong> 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