{"id":6810,"date":"2026-02-06T01:29:26","date_gmt":"2026-02-05T17:29:26","guid":{"rendered":"https:\/\/guides.visual-paradigm.com\/tw\/mastering-er-modeling-a-step-by-step-guide-with-real-world-examples-2of5\/"},"modified":"2026-02-06T01:29:26","modified_gmt":"2026-02-05T17:29:26","slug":"mastering-er-modeling-a-step-by-step-guide-with-real-world-examples-2of5","status":"publish","type":"post","link":"https:\/\/guides.visual-paradigm.com\/tw\/mastering-er-modeling-a-step-by-step-guide-with-real-world-examples-2of5\/","title":{"rendered":"\u638c\u63e1ER\u5efa\u6a21\uff1a\u5177\u5099\u5be6\u969b\u6848\u4f8b\u7684\u9010\u6b65\u6307\u5357\uff08\u7b2c\u4e94\u90e8\u5206\u4e2d\u7684\u7b2c\u4e8c\u90e8\u5206\uff09"},"content":{"rendered":"<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div 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border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<div class=\"flex flex-grow flex-col gap-3\">\n<div class=\"min-h-[20px] flex flex-col items-start gap-4 whitespace-pre-wrap\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<h2>\u7406\u89e3\u6982\u5ff5\u3001\u908f\u8f2f\u8207\u7269\u7406\u8cc7\u6599\u6a21\u578b\u4e4b\u9593\u7684\u5dee\u7570<\/h2>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"flex justify-between\">\u6982\u5ff5\u3001\u908f\u8f2f\u8207\u7269\u7406\u662f\u8cc7\u6599\u6a21\u578b\u8a2d\u8a08\u7684\u4e09\u500b\u4e3b\u8981\u968e\u6bb5\uff0c\u9019\u662f\u4e00\u500b\u8a2d\u8a08\u8cc7\u6599\u5eab\u4ee5\u5448\u73fe\u7d44\u7e54\u6216\u7cfb\u7d71\u5167\u8cc7\u6599\u8207\u95dc\u4fc2\u7684\u904e\u7a0b\u3002<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"absolute bottom-0 left-0 w-full border-t md:border-t-0 dark:border-white\/20 md:border-transparent md:dark:border-transparent md:bg-vert-light-gradient bg-white dark:bg-gray-800 md:!bg-transparent dark:md:bg-vert-dark-gradient pt-2\">\n<form class=\"stretch mx-2 flex flex-row gap-3 last:mb-2 md:mx-4 md:last:mb-6 lg:mx-auto lg:max-w-3xl\">\n<div class=\"relative flex h-full flex-1 md:flex-col\">\n<div class=\"flex ml-1 md:w-full md:m-auto md:mb-2 gap-0 md:gap-2 justify-center\">\n<p>\u4ee5\u4e0b\u662f\u5404\u968e\u6bb5\u7684\u6982\u8981\uff1a<\/p>\n<ol>\n<li><strong>\u6982\u5ff5\u8cc7\u6599\u6a21\u578b\uff1a<\/strong> \u6b64\u968e\u6bb5\u5c08\u6ce8\u65bc\u7406\u89e3\u8cc7\u6599\u7684\u9ad8\u968e\u8996\u5716\u53ca\u5176\u4e4b\u9593\u7684\u95dc\u4fc2\u3002\u5b83\u7368\u7acb\u65bc\u4efb\u4f55\u7279\u5b9a\u6280\u8853\u6216\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u3002\u4e3b\u8981\u76ee\u6a19\u662f\u8b58\u5225\u4e3b\u8981\u5be6\u9ad4\u3001\u5b83\u5011\u7684\u95dc\u4fc2\u4ee5\u53ca\u5c6c\u6027\u3002\u6b64\u968e\u6bb5\u7684\u6210\u679c\u662f\u6982\u5ff5\u8cc7\u6599\u6a21\u578b\uff0c\u7528\u65bc\u6307\u5c0e\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\u7684\u958b\u767c\u3002<\/li>\n<li><strong>\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\uff1a<\/strong> \u6b64\u968e\u6bb5\u5c08\u6ce8\u65bc\u8a73\u7d30\u5b9a\u7fa9\u8cc7\u6599\u7d50\u69cb\u548c\u95dc\u4fc2\u3002\u5b83\u5305\u542b\u4e00\u500b\u908f\u8f2f\u67b6\u69cb\uff0c\u5c07\u6982\u5ff5\u968e\u6bb5\u8b58\u5225\u7684\u8cc7\u6599\u6a21\u578b\u6982\u5ff5\u4ee5\u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u6216\u985e\u4f3c\u5de5\u5177\u9032\u884c\u6620\u5c04\u3002\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\u4ee5\u8cc7\u6599\u7d50\u69cb\u548c\u95dc\u4fc2\u7684\u89d2\u5ea6\u5448\u73fe\u696d\u52d9\u9700\u6c42\uff0c\u4e14\u7368\u7acb\u65bc\u5be6\u969b\u8cc7\u6599\u5eab\u8a2d\u8a08\u3002\u6b64\u968e\u6bb5\u7684\u6210\u679c\u662f\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\uff0c\u7528\u65bc\u6307\u5c0e\u7269\u7406\u8cc7\u6599\u6a21\u578b\u7684\u958b\u767c\u3002<\/li>\n<li><strong>\u7269\u7406\u8cc7\u6599\u6a21\u578b\uff1a<\/strong> \u6b64\u968e\u6bb5\u5c08\u6ce8\u65bc\u5c07\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\u8f49\u63db\u70ba\u7279\u5b9a\u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u540c\u6642\u8003\u616e\u76ee\u6a19DBMS\u7684\u6548\u80fd\u3001\u5132\u5b58\u9700\u6c42\u8207\u6280\u8853\u9650\u5236\u3002\u7269\u7406\u8cc7\u6599\u6a21\u578b\u63cf\u8ff0\u8cc7\u6599\u5eab\u7269\u4ef6\uff0c\u5982\u8868\u683c\u3001\u6b04\u4f4d\u8207\u7d22\u5f15\uff0c\u4ee5\u53ca\u5b83\u5011\u7684\u8cc7\u6599\u985e\u578b\u3001\u5927\u5c0f\u8207\u7d04\u675f\u3002\u6b64\u968e\u6bb5\u7684\u6210\u679c\u662f\u7269\u7406\u8cc7\u6599\u6a21\u578b\uff0c\u7528\u65bc\u5efa\u7acb\u548c\u5be6\u73fe\u8cc7\u6599\u5eab\u3002<\/li>\n<\/ol>\n<p>\u7e3d\u7d50\u800c\u8a00\uff0c\u6982\u5ff5\u968e\u6bb5\u4ee5\u9ad8\u968e\u65b9\u5f0f\u5b9a\u7fa9\u8cc7\u6599\u5be6\u9ad4\u53ca\u5176\u95dc\u4fc2\uff0c\u908f\u8f2f\u968e\u6bb5\u5b9a\u7fa9\u8a73\u7d30\u7684\u8cc7\u6599\u7d50\u69cb\u8207\u95dc\u4fc2\uff0c\u800c\u7269\u7406\u968e\u6bb5\u5247\u5c07\u908f\u8f2f\u8cc7\u6599\u6a21\u578b\u6620\u5c04\u81f3\u7279\u5b9a\u8cc7\u6599\u5eab\u6280\u8853\uff0c\u4e26\u5305\u542b\u6548\u80fd\u8207\u5132\u5b58\u8003\u91cf\u3002<\/p>\n<\/div>\n<\/div>\n<\/form>\n<\/div>\n<h2>\u5f9e\u554f\u984c\u63cf\u8ff0\u5efa\u7acb\u6982\u5ff5\u5be6\u9ad4\u95dc\u4fc2\u5716<\/h2>\n<p>\u5be6\u9ad4\u95dc\u4fc2\u5716\u5305\u542b\u56db\u500b\u5be6\u9ad4\uff1a\u8eca\u8f1b\u3001\u5ba2\u6236\u3001\u79df\u8cc3\u8207\u7dad\u4fee\u3002\u6bcf\u500b\u5be6\u9ad4\u90fd\u6709\u5176\u5c6c\u6027\uff0c\u4f8b\u5982\u8eca\u8f1b\u5be6\u9ad4\u7684\u8eca\u8f1b\u7de8\u865f\u3001\u578b\u865f\u3001\u88fd\u9020\u5546\u3001\u5e74\u4efd\u3001\u6bcf\u65e5\u79df\u91d1\u3001\u71c3\u6599\u985e\u578b\u3001\u662f\u5426\u53ef\u79df\u7528\uff1b\u5ba2\u6236\u5be6\u9ad4\u7684\u540d\u7a31\u3001\u59d3\u6c0f\u3001\u96fb\u5b50\u90f5\u4ef6\u3001\u96fb\u8a71\u865f\u78bc\u8207\u5730\u5740\uff1b\u79df\u8cc3\u5be6\u9ad4\u7684\u8d77\u59cb\u65e5\u671f\u3001\u7d50\u675f\u65e5\u671f\u3001\u79df\u8cc3\u8cbb\u7528\u3001\u4fdd\u96aa\u8cbb\u7528\u3001\u71c3\u6cb9\u8cbb\u7528\uff1b\u4ee5\u53ca\u7dad\u4fee\u5be6\u9ad4\u7684\u985e\u578b\u3001\u63cf\u8ff0\u3001\u8cbb\u7528\u8207\u7dad\u4fee\u65e5\u671f\u3002<\/p>\n<p>\u5be6\u9ad4\u95dc\u4fc2\u5716\u9084\u986f\u793a\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u5305\u62ec\u8eca\u8f1b\u8207\u79df\u8cc3\u5be6\u9ad4\u4e4b\u9593\u7684\u79df\u8cc3\u95dc\u4fc2\u3001\u79df\u8cc3\u8207\u5ba2\u6236\u5be6\u9ad4\u4e4b\u9593\u7684\u5ba2\u6236\u79df\u8cc3\u95dc\u4fc2\uff0c\u4ee5\u53ca\u8eca\u8f1b\u8207\u7dad\u4fee\u5be6\u9ad4\u4e4b\u9593\u7684\u8eca\u8f1b\u7dad\u4fee\u95dc\u4fc2\u3002<\/p>\n<div class=\"group w-full text-gray-800 dark:text-gray-100 border-b border-black\/10 dark:border-gray-900\/50 bg-gray-50 dark:bg-[#444654]\">\n<div class=\"text-base gap-4 md:gap-6 md:max-w-2xl lg:max-w-2xl xl:max-w-3xl p-4 md:py-6 flex lg:px-0 m-auto\">\n<div class=\"relative flex w-[calc(100%-50px)] flex-col gap-1 md:gap-3 lg:w-[calc(100%-115px)]\">\n<p><img alt=\"Car rental conceptual ERD\" class=\"alignnone size-full wp-image-1279\" decoding=\"async\" height=\"546\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-conceptual-erd.png\" width=\"358\"\/><\/p>\n<h2 id=\"adCJKkW\">\u5c07\u6982\u5ff5\u5be6\u9ad4\u95dc\u4fc2\u5716\u512a\u5316\u70ba\u908f\u8f2f\u5be6\u9ad4\u95dc\u4fc2\u5716<\/h2>\n<p>\u908f\u8f2f\u5be6\u9ad4\u95dc\u4fc2\u5716\u63a1\u7528\u66f4\u6b63\u5f0f\u4e14\u8a73\u7d30\u7684\u7b26\u865f\uff0c\u5f37\u8abf\u8868\u683c\u3001\u6b04\u4f4d\u3001\u9375\u8207\u95dc\u4fc2\u3002\u7279\u5225\u662f\uff0c\u6703\u6a19\u793a\u6b04\u4f4d\u7684\u8cc7\u6599\u985e\u578b\u3002\u6b64\u5916\uff0c\u9084\u70ba\u95dc\u4fc2\u52a0\u4e0a\u6a19\u7c64\uff08\u300c\u79df\u7528\u300d\u3001\u300c\u88ab\u79df\u7528\u300d\u8207\u300c\u9700\u8981\u300d\uff09\uff0c\u4ee5\u8868\u660e\u6bcf\u7a2e\u95dc\u4fc2\u7684\u6027\u8cea\u3002<\/p>\n<p><img alt=\"Car rental logical ERD\" class=\"alignnone size-full wp-image-1277\" decoding=\"async\" height=\"549\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-logical-erd.png\" width=\"496\"\/><\/p>\n<h2 id=\"adCJKkW\">\u5c07\u908f\u8f2f\u5be6\u9ad4\u95dc\u4fc2\u5716\u512a\u5316\u70ba\u7269\u7406\u5be6\u9ad4\u95dc\u4fc2\u5716<\/h2>\n<p>\u7269\u7406\u5be6\u9ad4\u95dc\u4fc2\u5716\u662f\u4e00\u7a2e\u300c\u8cc7\u6599\u5eab\u7d50\u69cb\u5716\u300d\uff0c\u63d0\u4f9b\u8db3\u5920\u7684\u7d30\u7bc0\u4ee5\u5728\u7279\u5b9aDBMS\u4e2d\u5be6\u73fe\u8cc7\u6599\u5eab\u3002\u5be6\u9ad4\u8207\u6b04\u4f4d\u7684\u547d\u540d\u5df2\u9032\u884c\u4fee\u6b63\uff0c\u4ee5\uff1a<\/p>\n<ul>\n<li>\u652f\u63f4DBMS\u7279\u5b9a\u8a9e\u6cd5\u3002<\/li>\n<li>\u78ba\u4fdd\u4f7f\u7528\u975e\u4fdd\u7559\u5b57\uff08\u4f8b\u5982\uff1aorder \u2192 purchase_order\uff0cdesc \u2192 description\uff09<\/li>\n<li>\u7b26\u5408\u7d44\u7e54\u7279\u5b9a\u7684\u547d\u540d\u898f\u7bc4<\/li>\n<\/ul>\n<p>\u7dad\u4fee\u5be6\u9ad4\u4e2d\u7684\u6b04\u4f4d\u300cdesc\u300d\u5df2\u66f4\u540d\u70ba\u300cdescription\u300d\u3002<\/p>\n<p><img loading=\"lazy\" alt=\"Car rental physical ERD\" class=\"alignnone size-full wp-image-1278\" decoding=\"async\" height=\"553\" loading=\"lazy\" src=\"https:\/\/guides.visual-paradigm.com\/wp-content\/uploads\/2023\/03\/car-rental-physical-erd.png\" width=\"485\"\/><\/p>\n<h2>\u8cc7\u6599\u5eab\u7d50\u69cb\u7522\u751f\uff1a\u5c07\u5be6\u9ad4\u95dc\u4fc2\u5716\u8f49\u63db\u70ba\u7269\u7406\u7d50\u69cb<\/h2>\n<p>\u8cc7\u6599\u5eab\u7d50\u69cb\u662f\u4e00\u7a2e\u8cc7\u6599\u5eab\u7d50\u69cb\u7684\u8996\u89ba\u5316\u5448\u73fe\uff0c\u5b9a\u7fa9\u4e86\u95dc\u4fc2\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\u8cc7\u6599\u7684\u7d44\u7e54\u65b9\u5f0f\u3002\u8a72\u7d50\u69cb\u662f\u6839\u64da\u7528\u65bc\u6a21\u64ec\u7cfb\u7d71\u4e2d\u4e0d\u540c\u5be6\u9ad4\u4e4b\u9593\u95dc\u4fc2\u7684\u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u6240\u5efa\u7acb\u7684\u3002<\/p>\n<p>\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0cERD\u9996\u5148\u88ab\u7d30\u5316\u70ba\u4e00\u500b\u908f\u8f2fERD\uff0c\u7528\u65bc\u5b9a\u7fa9Cars\u3001Customers\u3001Rentals\u548cMaintenance\u7b49\u5be6\u9ad4\u53ca\u5176\u5404\u81ea\u5c6c\u6027\u4e4b\u9593\u7684\u95dc\u4fc2\u3002\u908f\u8f2fERD\u6709\u52a9\u65bc\u5efa\u7acb\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\u548c\u57fa\u6578\u3002<\/p>\n<p>\u5728\u7d30\u5316\u908f\u8f2fERD\u4e4b\u5f8c\uff0c\u4e0b\u4e00\u6b65\u662f\u751f\u6210\u4e00\u500b\u7269\u7406ERD\uff0c\u7528\u65bc\u5b9a\u7fa9\u5be6\u969b\u7684\u8cc7\u6599\u5eab\u67b6\u69cb\uff0c\u5305\u542b\u6240\u6709\u5fc5\u8981\u7684\u8cc7\u6599\u985e\u578b\u3001\u4e3b\u9375\u548c\u5916\u9375\u4ee5\u53ca\u4efb\u4f55\u7d04\u675f\u689d\u4ef6\u3002\u7269\u7406ERD\u53cd\u6620\u4e86\u908f\u8f2fERD\uff0c\u4f46\u5c0d\u8cc7\u6599\u5728\u8cc7\u6599\u5eab\u4e2d\u5982\u4f55\u5b58\u5132\u63d0\u4f9b\u4e86\u66f4\u591a\u7d30\u7bc0\u3002<\/p>\n<p>\u6839\u64da\u7269\u7406ERD\uff0c\u64b0\u5beb\u4e86SQL\u7a0b\u5f0f\u78bc\uff0c\u4ee5\u5efa\u7acb\u5177\u6709\u9069\u7576\u8868\u683c\u3001\u6b04\u4f4d\u4ee5\u53ca\u5b83\u5011\u4e4b\u9593\u95dc\u4fc2\u7684\u8cc7\u6599\u5eab\u67b6\u69cb\u3002\u67b6\u69cb\u4e2d\u7684\u6bcf\u500b\u8868\u683c\u4ee3\u8868\u7cfb\u7d71\u4e2d\u7684\u4e00\u500b\u5be6\u9ad4\uff0c\u6b04\u4f4d\u5247\u4ee3\u8868\u8a72\u5be6\u9ad4\u7684\u5c6c\u6027\u3002\u4e3b\u9375\u88ab\u5b9a\u7fa9\u70ba\u552f\u4e00\u8b58\u5225\u8868\u683c\u4e2d\u7684\u6bcf\u7b46\u8a18\u9304\uff0c\u800c\u5916\u9375\u5247\u7528\u65bc\u5efa\u7acb\u8868\u683c\u4e4b\u9593\u7684\u95dc\u4fc2\u3002<\/p>\n<blockquote>\n<p>CREATE TABLE Car (<br \/>\ncar_id INT PRIMARY KEY,<br \/>\nmodel VARCHAR(255),<br \/>\nmake VARCHAR(255),<br \/>\nyear INT,<br \/>\ndaily_rate DECIMAL(10, 2),<br \/>\nfuel_type VARCHAR(255),<br \/>\nis_available BOOLEAN<br \/>\n);<\/p>\n<p>CREATE TABLE Customer (<br \/>\ncustomer_id INT PRIMARY KEY,<br \/>\nfirst_name VARCHAR(255),<br \/>\nlast_name VARCHAR(255),<br \/>\nemail VARCHAR(255),<br \/>\nphone_number VARCHAR(255),<br \/>\naddress VARCHAR(255)<br \/>\n);<\/p>\n<p>CREATE TABLE Rental (<br \/>\nrental_id INT PRIMARY KEY,<br \/>\nstart_date DATE,<br \/>\nend_date DATE,<br \/>\nrental_rate DECIMAL(10, 2),<br \/>\ninsurance_charge DECIMAL(10, 2),<br \/>\nfuel_charge DECIMAL(10, 2),<br \/>\ncar_id INT,<br \/>\ncustomer_id INT,<br \/>\nFOREIGN KEY (car_id) REFERENCES Car(car_id),<br \/>\n\u5916\u9375 (customer_id) \u53c3\u7167 Customer(customer_id)<br \/>\n);<\/p>\n<p>\u5efa\u7acb\u8cc7\u6599\u8868 Maintenance (<br \/>\nmaintenance_id \u6574\u6578 \u4e3b\u9375,<br \/>\ntype \u8b8a\u9577\u5b57\u4e32(255),<br \/>\ndescription \u6587\u5b57,<br \/>\ncost \u5341\u9032\u4f4d\u6578(10, 2),<br \/>\nmaintenance_date \u65e5\u671f,<br \/>\ncar_id \u6574\u6578,<br \/>\n\u5916\u9375 (car_id) \u53c3\u7167 Car(car_id)<br \/>\n);<\/p>\n<\/blockquote>\n<h2>\u6458\u8981<\/h2>\n<\/div>\n<p>\u672c\u6587\u8a0e\u8ad6\u4e86\u5982\u4f55\u900f\u904e\u512a\u5316\u5be6\u9ad4\u95dc\u4fc2\u5716\uff08ERD\uff09\u4f86\u7522\u751f\u6709\u6548\u7684\u8cc7\u6599\u5eab\u7d50\u69cb\u3002ERD \u6703\u5f9e\u6982\u5ff5\u5c64\u7d1a\u9010\u6b65\u512a\u5316\u81f3\u908f\u8f2f\u5c64\u7d1a\uff0c\u518d\u9032\u4e00\u6b65\u8f49\u63db\u70ba\u7269\u7406\u5c64\u7d1a\u3002\u908f\u8f2f ERD \u5efa\u7acb\u4e86\u5be6\u9ad4\u4e4b\u9593\u7684\u95dc\u4fc2\u8207\u95dc\u806f\u6027\uff0c\u800c\u7269\u7406 ERD \u5247\u5b9a\u7fa9\u4e86\u5be6\u969b\u7684\u8cc7\u6599\u5eab\u7d50\u69cb\uff0c\u5305\u542b\u6240\u6709\u5fc5\u8981\u7684\u8cc7\u6599\u578b\u614b\u3001\u4e3b\u9375\u8207\u5916\u9375\uff0c\u4ee5\u53ca\u9650\u5236\u689d\u4ef6\u3002<\/p>\n<p>\u63a5\u8457\u6839\u64da\u7269\u7406 ERD \u5beb\u51fa SQL \u7a0b\u5f0f\u78bc\uff0c\u4ee5\u5efa\u7acb\u5177\u5099\u9069\u7576\u8cc7\u6599\u8868\u3001\u6b04\u4f4d\u8207\u95dc\u4fc2\u7684\u8cc7\u6599\u5eab\u7d50\u69cb\u3002\u672c\u6587\u5f37\u8abf\u512a\u5316 ERD \u5c0d\u65bc\u6709\u6548\u8cc7\u6599\u5eab\u8a2d\u8a08\u7684\u91cd\u8981\u6027\uff0c\u4e26\u63d0\u4f9b\u5f9e ERD \u7522\u751f\u8cc7\u6599\u5eab\u7d50\u69cb\u904e\u7a0b\u7684\u6df1\u5165\u898b\u89e3\u3002<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u512a\u5316\u5be6\u9ad4-\u95dc\u4fc2\u5716\uff08ERD\uff09\u4ee5\u5be6\u73fe\u6709\u6548\u7684\u8cc7\u6599\u5eab\u8a2d\u8a08 \u554f\u984c\u63cf\u8ff0\uff1aER\u5efa\u6a21 \u2013 \u6c7d\u8eca\u79df\u8cc3\u516c\u53f8\u7cfb\u7d71 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