{"id":53,"date":"2026-04-07T16:17:17","date_gmt":"2026-04-07T16:17:17","guid":{"rendered":"https:\/\/www.we-notes.com\/tw\/er-diagram-data-redundancy-legacy-migration\/"},"modified":"2026-04-07T16:17:17","modified_gmt":"2026-04-07T16:17:17","slug":"er-diagram-data-redundancy-legacy-migration","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/tw\/er-diagram-data-redundancy-legacy-migration\/","title":{"rendered":"\u6848\u4f8b\u7814\u7a76\uff1a\u5982\u4f55\u900f\u904e\u8907\u96dc\u7684ER\u5716\u89e3\u6c7a\u907a\u7559\u7cfb\u7d71\u9077\u79fb\u4e2d\u7684\u8cc7\u6599\u91cd\u8907\u554f\u984c"},"content":{"rendered":"<p>\u5728\u8cc7\u6599\u67b6\u69cb\u9818\u57df\uff0c\u5f88\u5c11\u6709\u6311\u6230\u6bd4\u907a\u7559\u7cfb\u7d71\u4e2d\u7684\u8cc7\u6599\u91cd\u8907\u554f\u984c\u66f4\u70ba\u6301\u4e45\u3002\u7576\u7d44\u7e54\u81f4\u529b\u65bc\u73fe\u4ee3\u5316\u5176\u57fa\u790e\u8a2d\u65bd\u6642\uff0c\u5927\u91cf\u91cd\u8907\u3001\u4e0d\u4e00\u81f4\u4e14\u5b64\u7acb\u7684\u8cc7\u6599\u5f80\u5f80\u6210\u70ba\u4e3b\u8981\u74f6\u9838\u3002\u672c\u6848\u4f8b\u7814\u7a76\u63a2\u8a0e\u4e86\u4e00\u500b\u771f\u5be6\u60c5\u5883\uff0c\u5176\u4e2d\u8a73\u7d30\u7684\u5be6\u9ad4-\u95dc\u4fc2\u5716\uff08ERD\uff09\u4f5c\u70ba\u89e3\u6c7a\u91cd\u5927\u9077\u79fb\u5c08\u6848\u671f\u9593\u95dc\u9375\u8cc7\u6599\u5b8c\u6574\u6027\u554f\u984c\u7684\u85cd\u5716\u3002<\/p>\n<p>\u76ee\u6a19\u975e\u5e38\u660e\u78ba\uff1a\u5f9e\u788e\u7247\u5316\u3001\u57fa\u65bc\u5e73\u9762\u6a94\u6848\u7684\u907a\u7559\u74b0\u5883\uff0c\u8f49\u5411\u7a69\u5065\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\uff0c\u540c\u6642\u4e0d\u640d\u5931\u8cc7\u6599\u7684\u6e96\u78ba\u6027\uff0c\u4e5f\u4e0d\u5f15\u5165\u65b0\u7684\u4e0d\u4e00\u81f4\u3002\u89e3\u6c7a\u65b9\u6848\u4e26\u4e0d\u5728\u9077\u79fb\u5de5\u5177\u672c\u8eab\uff0c\u800c\u5728\u65bc\u5728\u79fb\u52d5\u4efb\u4f55\u4f4d\u5143\u4e4b\u524d\uff0c\u5c0d\u8cc7\u6599\u9032\u884c\u8996\u89ba\u5316\u5efa\u6a21\u8207\u908f\u8f2f\u7d50\u69cb\u5316\u3002\u6211\u5011\u5c07\u63a2\u8a0e\u6b64\u65b9\u6cd5\u7684\u5be6\u65bd\u904e\u7a0b\u3001\u6240\u9047\u5230\u7684\u5177\u9ad4\u6b63\u898f\u5316\u6311\u6230\uff0c\u4ee5\u53ca\u56b4\u8b39\u7684\u8cc7\u6599\u7d50\u69cb\u8a2d\u8a08\u65b9\u6cd5\u6240\u5e36\u4f86\u7684\u5be6\u969b\u6210\u679c\u3002<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img alt=\"Marker-style infographic illustrating how Entity-Relationship Diagrams solve data redundancy in legacy system migration, featuring before\/after database structure comparison, three normalization steps (1NF, 2NF, 3NF), visual ERD showing Customer-Account-Transaction-Branch relationships with cardinality labels, migration workflow (Extract-Cleanse-Transform-Map-Load), and key outcomes: 35% storage reduction, faster queries, single-update efficiency, and 100% data consistency\" decoding=\"async\" src=\"https:\/\/www.we-notes.com\/wp-content\/uploads\/2026\/04\/er-diagram-legacy-migration-infographic-marker-illustration.jpg\"\/><\/figure>\n<\/div>\n<h2>\ud83d\udd0d 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\u5be6\u9ad4-\u95dc\u4fc2\u5716\u7684\u89d2\u8272<\/h2>\n<p>\u5be6\u9ad4-\u95dc\u4fc2\u5716\u4e0d\u50c5\u50c5\u662f\u4e00\u5f35\u5716\u8868\uff0c\u66f4\u662f\u8cc7\u6599\u8207\u6d88\u8cbb\u5b83\u7684\u61c9\u7528\u7a0b\u5f0f\u4e4b\u9593\u7684\u908f\u8f2f\u5408\u7d04\u3002\u5728\u6b64\u6b21\u9077\u79fb\u4e2d\uff0cERD\u626e\u6f14\u4e86\u552f\u4e00\u771f\u5be6\u4f86\u6e90\u7684\u89d2\u8272\u3002\u5b83\u8feb\u4f7f\u5718\u968a\u5728\u5be6\u969b\u5be6\u65bd\u4e4b\u524d\uff0c\u660e\u78ba\u5b9a\u7fa9\u95dc\u4fc2\u3001\u8b58\u5225\u4e3b\u9375\uff0c\u4e26\u5efa\u7acb\u57fa\u6578\u898f\u5247\u3002<\/p>\n<p>\u70ba\u4f55ERD\u5c0d\u6b64\u5c08\u6848\u81f3\u95dc\u91cd\u8981\uff1f<\/p>\n<ul>\n<li><strong>\u53ef\u8996\u5316\u8907\u96dc\u6027\uff1a<\/strong>\u907a\u7559\u8cc7\u6599\u95dc\u4fc2\u662f\u6a21\u7cca\u4e0d\u6e05\u7684\u3002\u5716\u8868\u4f7f\u96b1\u85cf\u7684\u4f9d\u8cf4\u95dc\u4fc2\u8b8a\u5f97\u6e05\u6670\u53ef\u898b\u3002<\/li>\n<li><strong>\u6b63\u898f\u5316\u5f37\u5236\u57f7\u884c\uff1a<\/strong>\u8a72\u6a21\u578b\u8981\u6c42\u5718\u968a\u61c9\u7528\u6b63\u898f\u5316\u898f\u5247\uff0c\u7cfb\u7d71\u6027\u5730\u6d88\u9664\u91cd\u8907\u8cc7\u6599\u3002<\/li>\n<li><strong>\u6620\u5c04\u6307\u5357\uff1a<\/strong>\u5b83\u70ba\u5c07\u907a\u7559\u6b04\u4f4d\u6620\u5c04\u81f3\u65b0\u7684\u6b63\u898f\u5316\u8cc7\u6599\u8868\u63d0\u4f9b\u4e86\u6e05\u6670\u8def\u5f91\u3002<\/li>\n<li><strong>\u5229\u5bb3\u95dc\u4fc2\u4eba\u6e9d\u901a\uff1a<\/strong>\u5b83\u8b93\u696d\u52d9\u5206\u6790\u5e2b\u80fd\u5920\u6839\u64da\u73fe\u5be6\u4e16\u754c\u7684\u696d\u52d9\u6d41\u7a0b\u4f86\u9a57\u8b49\u908f\u8f2f\u3002<\/li>\n<\/ul>\n<h2>\ud83d\udcc2 \u6848\u4f8b\u7814\u7a76\u60c5\u5883\uff1a\u96f6\u552e\u9280\u884c\u6574\u5408<\/h2>\n<p>\u5728\u672c\u6b21\u5206\u6790\u4e2d\uff0c\u6211\u5011\u8003\u616e\u4e00\u5bb6\u96f6\u552e\u9280\u884c\u5f9e\u4e3b\u6a5f\u6642\u4ee3\u7684\u7cfb\u7d71\u9077\u79fb\u81f3\u57fa\u65bc\u96f2\u7aef\u7684\u95dc\u4fc2\u578b\u8cc7\u6599\u5eab\u3002\u820a\u7cfb\u7d71\u7ba1\u7406\u5ba2\u6236\u5e33\u6236\u3001\u4ea4\u6613\u548c\u8cb8\u6b3e\u8a18\u9304\u3002\u7136\u800c\uff0c\u7531\u65bc\u7cfb\u7d71\u5e74\u4ee3\u4e45\u9060\uff0c\u5ba2\u6236\u8cc7\u8a0a\u5728\u4ea4\u6613\u65e5\u8a8c\u4e2d\u88ab\u91cd\u8907\u5132\u5b58\u3002<\/p>\n<p><strong>ERD\u5206\u6790\u4e4b\u524d\uff1a<\/strong><\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>\u8868\u683c\u540d\u7a31<\/th>\n<th>\u4e3b\u8981\u9375<\/th>\n<th>\u91cd\u8907\u8cc7\u6599<\/th>\n<th>\u554f\u984c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>TXN_LOG<\/strong><\/td>\n<td>TXN_ID<\/td>\n<td>\u5ba2\u6236\u59d3\u540d\u3001\u5730\u5740<\/td>\n<td>\u5730\u5740\u8b8a\u66f4\u9700\u8981\u66f4\u65b0\u6578\u5343\u5217\u8cc7\u6599\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>ACCT_HIST<\/strong><\/td>\n<td>HIST_ID<\/td>\n<td>\u5206\u884c\u4ee3\u78bc\u3001\u5206\u884c\u4f4d\u7f6e<\/td>\n<td>\u5206\u884c\u95dc\u9589\u5c0e\u81f4\u8cc7\u6599\u885d\u7a81\u3002<\/td>\n<\/tr>\n<tr>\n<td><strong>LOAN_DETL<\/strong><\/td>\n<td>LOAN_ID<\/td>\n<td>\u5ba2\u6236\u7de8\u865f\u3001\u5e33\u6236\u7de8\u865f<\/td>\n<td>\u9023\u7d50\u7d93\u5e38\u907a\u6f0f\u6216\u91cd\u8907\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6b64\u7d50\u69cb\u9055\u53cd\u4e86\u8cc7\u6599\u5eab\u8a2d\u8a08\u7684\u57fa\u672c\u539f\u5247\u3002ERD\u6d41\u7a0b\u8981\u6c42\u5c07\u9019\u4e9b\u8868\u683c\u62c6\u5206\u70ba\u539f\u5b50\u4e14\u7368\u7acb\u7684\u5be6\u9ad4\u3002<\/p>\n<h2>\ud83e\udde9 \u6b65\u9a5f 1\uff1a\u8b58\u5225\u5be6\u9ad4\u8207\u95dc\u4fc2<\/h2>\n<p>\u9077\u79fb\u7684\u7b2c\u4e00\u968e\u6bb5\u6d89\u53ca\u5f9e\u820a\u7cfb\u7d71\u4e2d\u63d0\u53d6\u6bcf\u4e00\u5f35\u8868\u683c\u548c\u6b04\u4f4d\u3002\u5718\u968a\u96a8\u5f8c\u5c07\u9019\u4e9b\u9805\u76ee\u5c0d\u61c9\u5230\u908f\u8f2f\u5be6\u9ad4\u3002\u76ee\u6a19\u662f\u8b58\u5225\u696d\u52d9\u9818\u57df\u4e2d\u7684\u7368\u7acb\u7269\u4ef6\u3002<\/p>\n<ul>\n<li><strong>\u5ba2\u6236\uff1a<\/strong> \u4e00\u500b\u6301\u6709\u5e33\u6236\u7684\u7368\u7279\u500b\u4eba\u6216\u5be6\u9ad4\u3002<\/li>\n<li><strong>\u5e33\u6236\uff1a<\/strong> \u5ba2\u6236\u6301\u6709\u7684\u7279\u5b9a\u91d1\u878d\u7522\u54c1\u3002<\/li>\n<li><strong>\u4ea4\u6613\uff1a<\/strong> \u8207\u5e33\u6236\u76f8\u95dc\u7684\u8cc7\u91d1\u79fb\u52d5\u3002<\/li>\n<li><strong>\u5206\u652f\uff1a<\/strong> \u4e00\u500b\u5be6\u969b\u7684\u9280\u884c\u904b\u4f5c\u5730\u9ede\u3002<\/li>\n<\/ul>\n<p>\u5be6\u9ad4\u5b9a\u7fa9\u5b8c\u6210\u5f8c\uff0c\u4fbf\u5efa\u7acb\u4e86\u95dc\u4fc2\u3002ERD\u986f\u793a\uff0c\u4e00\u500b\u5ba2\u6236\u53ef\u4ee5\u64c1\u6709\u591a\u4e2a\u5e33\u6236\u3002\u4e00\u500b\u5e33\u6236\u53ef\u4ee5\u6709\u591a\u7b46\u4ea4\u6613\u3002\u4e00\u7b46\u4ea4\u6613\u6703\u8207\u7279\u5b9a\u5206\u652f\u76f8\u95dc\u806f\u3002\u9019\u4e9b\u95dc\u4fc2\u901a\u5e38\u8868\u793a\u70ba\uff1a<\/p>\n<ul>\n<li><strong>\u4e00\u5c0d\u591a (1:N)\uff1a<\/strong> \u4e00\u500b\u5ba2\u6236\u5c0d\u61c9\u591a\u500b\u5e33\u6236\u3002<\/li>\n<li><strong>\u4e00\u5c0d\u591a (1:N)\uff1a<\/strong> \u4e00\u500b\u5e33\u6236\u5c0d\u61c9\u591a\u7b46\u4ea4\u6613\u3002<\/li>\n<li><strong>\u591a\u5c0d\u4e00 (M:1)\uff1a<\/strong> \u591a\u7b46\u4ea4\u6613\u5c0d\u61c9\u4e00\u500b\u5206\u652f\u3002<\/li>\n<\/ul>\n<p>\u900f\u904e\u8996\u89ba\u5316\u5730\u7e6a\u88fd\u9019\u4e9b\u9023\u7d50\uff0c\u5718\u968a\u8b58\u5225\u51fa\u8cc7\u6599\u91cd\u8907\u7684\u4f4d\u7f6e\u3002\u4f8b\u5982\uff0c\u5ba2\u6236\u59d3\u540d\u51fa\u73fe\u5728 <code>TXN_LOG<\/code> \u8868\u683c\u4e2d\u3002\u5728\u898f\u7bc4\u5316\u6a21\u578b\u4e2d\uff0c\u4ea4\u6613\u8868\u683c\u61c9\u50c5\u5132\u5b58\u5c0d\u5ba2\u6236\u8868\u683c\u7684\u53c3\u8003\uff08\u5916\u9375\uff09\uff0c\u800c\u975e\u8cc7\u6599\u672c\u8eab\u3002<\/p>\n<h2>\ud83d\udcd0 \u6b65\u9a5f 2\uff1a\u61c9\u7528\u898f\u7bc4\u5316\u898f\u5247<\/h2>\n<p>\u898f\u7bc4\u5316\u662f\u7d44\u7e54\u8cc7\u6599\u4ee5\u6e1b\u5c11\u5197\u9918\u4e26\u63d0\u5347\u5b8c\u6574\u6027\u7684\u4e00\u7a2e\u904e\u7a0b\u3002ERD\u6a21\u578b\u5f15\u5c0e\u5718\u968a\u5b8c\u6210\u6a19\u6e96\u7684\u898f\u7bc4\u5f62\u5f0f\u3002<\/p>\n<h3>\u7b2c\u4e00\u7bc4\u5f0f (1NF)<\/h3>\n<p>\u820a\u7cfb\u7d71\u5305\u542b\u91cd\u8907\u7fa4\u7d44\u3002\u4f8b\u5982\uff0c\u820a\u5ba2\u6236\u8868\u683c\u4e2d\u7684\u4e00\u884c\u53ef\u80fd\u5728\u55ae\u4e00\u6b04\u4f4d\u4e2d\u5132\u5b58\u591a\u500b\u96fb\u8a71\u865f\u78bc\uff08\u4f8b\u5982\uff1a\u300c555-0199, 555-0200\u300d\uff09\u3002<\/p>\n<ul>\n<li><strong>\u554f\u984c\uff1a<\/strong> \u9019\u4f7f\u5f97\u67e5\u8a62\u7279\u5b9a\u96fb\u8a71\u865f\u78bc\u8b8a\u5f97\u56f0\u96e3\uff0c\u4e26\u9055\u53cd\u4e86\u539f\u5b50\u6027\u3002<\/li>\n<li><strong>ERD \u89e3\u6c7a\u65b9\u6848\uff1a<\/strong> \u5efa\u7acb\u4e00\u500b\u7368\u7acb\u7684 <strong>Contact_Information<\/strong> \u5be6\u9ad4\uff0c\u8207\u5ba2\u6236\u5be6\u9ad4\u9023\u7d50\u3002\u6b64\u65b0\u8868\u683c\u4e2d\u7684\u6bcf\u4e00\u5217\u50c5\u5132\u5b58\u4e00\u500b\u96fb\u8a71\u865f\u78bc\u3002<\/li>\n<\/ul>\n<h3>\u7b2c\u4e8c\u7bc4\u5f0f (2NF)<\/h3>\n<p>2NF \u8981\u6c42\u8868\u683c\u5fc5\u9808\u8655\u65bc 1NF\uff0c\u4e14\u6240\u6709\u975e\u9375\u5c6c\u6027\u5fc5\u9808\u5b8c\u5168\u4f9d\u8cf4\u65bc\u4e3b\u9375\u3002\u820a\u7cfb\u7d71\u7684 <code>TXN_LOG<\/code> \u8868\u683c\u5177\u6709\u8907\u5408\u9375 <code>TXN_ID<\/code> \u548c <code>DATE<\/code>\u3002\u7136\u800c\uff0c\u5ba2\u6236\u8a73\u60c5\u50c5\u4f9d\u8cf4\u65bc <code>\u5ba2\u6236\u7de8\u865f<\/code>\uff0c\u800c\u4e0d\u662f\u4ea4\u6613\u65e5\u671f\u3002<\/p>\n<ul>\n<li><strong>\u554f\u984c\uff1a<\/strong>\u5ba2\u6236\u8cc7\u6599\u5728\u6bcf\u6b21\u4ea4\u6613\u4e2d\u91cd\u8907\u51fa\u73fe\uff0c\u5c0e\u81f4\u66f4\u65b0\u7570\u5e38\u3002<\/li>\n<li><strong>ERD \u89e3\u6c7a\u65b9\u6848\uff1a<\/strong> \u5f9e\u4ea4\u6613\u8868\u4e2d\u79fb\u9664\u5ba2\u6236\u8a73\u7d30\u8cc7\u6599\u3002\u5c07\u5176\u5132\u5b58\u5728\u5c08\u7528\u7684<strong>\u5ba2\u6236<\/strong>\u8868\u4e2d\uff0c\u4e26\u900f\u904e\u5916\u9375\u9032\u884c\u9023\u7d50\u3002<\/li>\n<\/ul>\n<h3>\u7b2c\u4e09\u7bc4\u5f0f\uff083NF\uff09<\/h3>\n<p>3NF \u8981\u6c42\u6240\u6709\u5c6c\u6027\u50c5\u4f9d\u8cf4\u65bc\u4e3b\u9375\uff0c\u4e0d\u5f97\u5b58\u5728\u50b3\u905e\u4f9d\u8cf4\u3002\u5728\u820a\u7cfb\u7d71\u4e2d\uff0c<code>\u5206\u884c<\/code>\u7684\u540d\u7a31\u548c\u5730\u5740\u5132\u5b58\u5728<code>\u5e33\u6236<\/code>\u8868\u4e2d\uff0c\u4f46\u5b83\u5011\u4f9d\u8cf4\u65bc<code>\u5206\u884c\u7de8\u865f<\/code>\uff0c\u800c\u975e<code>\u5e33\u6236\u7de8\u865f<\/code>.<\/p>\n<ul>\n<li><strong>\u554f\u984c\uff1a<\/strong>\u5982\u679c\u5206\u884c\u66f4\u63db\u5730\u9ede\uff0c\u6240\u6709\u8207\u8a72\u5206\u884c\u76f8\u95dc\u7684\u5e33\u6236\u8a18\u9304\u90fd\u5fc5\u9808\u66f4\u65b0\u3002<\/li>\n<li><strong>ERD \u89e3\u6c7a\u65b9\u6848\uff1a<\/strong> \u5efa\u7acb\u4e00\u500b\u7368\u7acb\u7684<strong>\u5206\u884c<\/strong>\u8868\u3002\u73fe\u5728<code>\u5e33\u6236<\/code>\u8868\u50c5\u5132\u5b58<code>\u5206\u884c\u7de8\u865f<\/code>.<\/li>\n<\/ul>\n<h2>\ud83d\udd04 \u6b65\u9a5f 3\uff1a\u9077\u79fb\u57f7\u884c\u7b56\u7565<\/h2>\n<p>\u5728\u5b9a\u7fa9\u65b0\u7684 ERD \u5f8c\uff0c\u9077\u79fb\u8a08\u756b\u5373\u4ee5\u65b0\u8cc7\u6599\u7d50\u69cb\u70ba\u57fa\u790e\u9032\u884c\u898f\u5283\u3002\u6b64\u904e\u7a0b\u4e26\u975e\u7c21\u55ae\u7684\u8907\u88fd\u8cbc\u4e0a\uff0c\u800c\u662f\u4e00\u6b21\u8f49\u63db\u3002<\/p>\n<ol>\n<li><strong>\u8cc7\u6599\u63d0\u53d6\uff1a<\/strong>\u539f\u59cb\u8cc7\u6599\u5f9e\u820a\u7cfb\u7d71\u63d0\u53d6\u81f3\u66ab\u5b58\u5340\u3002<\/li>\n<li><strong>\u6e05\u6d17\uff1a<\/strong>\u6839\u64daERD\u4e2d\u5b9a\u7fa9\u7684\u696d\u52d9\u91d1\u9470\uff0c\u8b58\u5225\u4e26\u5408\u4f75\u91cd\u8907\u8a18\u9304\u3002<\/li>\n<li><strong>\u8f49\u63db\uff1a<\/strong>\u64b0\u5beb\u8173\u672c\uff0c\u6839\u64da\u7b2c\u4e00\u7bc4\u5f0f\uff081NF\uff09\u3001\u7b2c\u4e8c\u7bc4\u5f0f\uff082NF\uff09\u548c\u7b2c\u4e09\u7bc4\u5f0f\uff083NF\uff09\u7684\u898f\u5247\uff0c\u5c07\u975e\u898f\u7bc4\u5316\u7684\u6b04\u4f4d\u62c6\u5206\u81f3\u65b0\u8868\u683c\u4e2d\u3002<\/li>\n<li><strong>\u6620\u5c04\uff1a<\/strong>\u7522\u751f\u5916\u9375\u4ee5\u9023\u7d50\u65b0\u8868\u683c\u3002\u4f7f\u7528\u4ee3\u7406\u9375\uff08\u7cfb\u7d71\u7522\u751f\u7684ID\uff09\u4ee5\u78ba\u4fdd\u7a69\u5b9a\u6027\uff0c\u4e0d\u53d7\u820a\u7cfb\u7d71\u696d\u52d9\u91d1\u9470\u5f71\u97ff\u3002<\/li>\n<li><strong>\u8f09\u5165\uff1a<\/strong>\u8cc7\u6599\u4f9d\u7167\u7279\u5b9a\u9806\u5e8f\u63d2\u5165\u76ee\u6a19\u8cc7\u6599\u5eab\uff0c\u4ee5\u78ba\u4fdd\u53c3\u8003\u5b8c\u6574\u6027\uff08\u7236\u8868\u512a\u5148\u65bc\u5b50\u8868\uff09\u3002<\/li>\n<\/ol>\n<p>ERD\u5728\u6b64\u81f3\u95dc\u91cd\u8981\uff0c\u5b83\u6c7a\u5b9a\u4e86\u8f09\u5165\u9806\u5e8f\u3002\u4f8b\u5982\uff0c<strong>\u5ba2\u6236<\/strong>\u8868\u683c\u5fc5\u9808\u5728<strong>\u5e33\u6236<\/strong>\u8868\u683c\u4e4b\u524d\u8f09\u5165\uff0c\u800c\u8a72\u8868\u683c\u53c8\u5fc5\u9808\u5728<strong>\u4ea4\u6613<\/strong>\u8868\u683c\u4e4b\u524d\u8f09\u5165\u3002\u82e5\u4ee5\u5176\u4ed6\u9806\u5e8f\u8f09\u5165\uff0c\u5c07\u5c0e\u81f4\u7d04\u675f\u9055\u898f\u3002<\/p>\n<h2>\u2705 \u6b65\u9a5f4\uff1a\u9a57\u8b49\u8207\u6e2c\u8a66<\/h2>\n<p>\u9077\u79fb\u5f8c\u7684\u9a57\u8b49\u5de5\u4f5c\u975e\u5e38\u5168\u9762\u3002\u76ee\u6a19\u662f\u78ba\u4fdd\u8cc7\u6599\u7e3d\u91cf\u4fdd\u6301\u4e0d\u8b8a\uff0c\u5373\u4f7f\u7d50\u69cb\u5df2\u6539\u8b8a\u3002\u5718\u968a\u5229\u7528ERD\u5b9a\u7fa9\u8cc7\u6599\u7684\u9810\u671f\u72c0\u614b\u3002<\/p>\n<h3>\u5b8c\u6574\u6027\u6aa2\u67e5<\/h3>\n<ul>\n<li><strong>\u53c3\u8003\u5b8c\u6574\u6027\uff1a<\/strong>\u78ba\u4fdd<code>\u5ba2\u6236ID<\/code>\u5728\u5e33\u6236\u8868\u683c\u4e2d\u5b58\u5728\u65bc\u5ba2\u6236\u8868\u683c\u4e2d\u3002<\/li>\n<li><strong>\u5b8c\u6574\u6027\uff1a<\/strong>\u78ba\u8a8d\u8f49\u63db\u904e\u7a0b\u4e2d\u6c92\u6709\u8a18\u9304\u907a\u5931\u3002<\/li>\n<li><strong>\u552f\u4e00\u6027\uff1a<\/strong>\u78ba\u8a8d\u4e3b\u9375\u5177\u6709\u552f\u4e00\u6027\uff0c\u4e14\u65b0\u8868\u683c\u4e2d\u4e0d\u5b58\u5728\u91cd\u8907\u8cc7\u6599\u3002<\/li>\n<\/ul>\n<h3>\u5c0d\u6bd4\u6307\u6a19<\/h3>\n<p>\u4ee5\u4e0b\u6307\u6a19\u7528\u65bc\u6bd4\u8f03\u4f86\u6e90\u7cfb\u7d71\u8207\u76ee\u6a19\u7cfb\u7d71\uff1a<\/p>\n<table border=\"1\" cellpadding=\"5\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>\u9a57\u8b49\u6307\u6a19<\/th>\n<th>\u76ee\u6a19\u6a19\u6e96<\/th>\n<th>\u65b9\u6cd5<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u8a18\u9304\u6578\u91cf<\/strong><\/td>\n<td>\u4f86\u6e90\u6578\u91cf = \u76ee\u6a19\u6578\u91cf<\/td>\n<td>\u6bcf\u500b\u6a19\u6e96\u5316\u5be6\u9ad4\u7684\u5217\u6578<\/td>\n<\/tr>\n<tr>\n<td><strong>\u6578\u503c\u7e3d\u548c<\/strong><\/td>\n<td>\u4f86\u6e90\u7e3d\u9918\u984d = \u76ee\u6a19\u7e3d\u9918\u984d<\/td>\n<td>\u6578\u503c\u6b04\u4f4d\u7684\u805a\u5408<\/td>\n<\/tr>\n<tr>\n<td><strong>\u7a7a\u503c\u6aa2\u67e5<\/strong><\/td>\n<td>NOT NULL \u6b04\u4f4d\u4e2d\u7121\u610f\u5916\u7684\u96f6\u7a7a\u503c<\/td>\n<td>\u67e5\u8a62\u9650\u5236<\/td>\n<\/tr>\n<tr>\n<td><strong>\u91cd\u8907\u6aa2\u67e5<\/strong><\/td>\n<td>\u4e3b\u9375\u4e0a\u7121\u91cd\u8907<\/td>\n<td>GROUP BY \u5206\u6790<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\ud83d\udcc9 \u5197\u9918\u6e1b\u5c11\u7684\u5f71\u97ff<\/h2>\n<p>\u5f9e\u50b3\u7d71\u7d50\u69cb\u8f49\u5411\u6a19\u6e96\u5316\u7684ERD\u6a21\u578b\uff0c\u5e36\u4f86\u4e86\u53ef\u8861\u91cf\u7684\u6548\u80fd\u8207\u7dad\u8b77\u6539\u5584\u3002<\/p>\n<ul>\n<li><strong>\u5132\u5b58\u6548\u7387\uff1a<\/strong> \u900f\u904e\u79fb\u9664\u91cd\u8907\u7684\u5ba2\u6236\u5730\u5740\u8207\u5206\u652f\u7d30\u7bc0\uff0c\u5132\u5b58\u9700\u6c42\u964d\u4f4e\u4e86\u7d0435%\u3002<\/li>\n<li><strong>\u67e5\u8a62\u6548\u80fd\uff1a<\/strong> \u4ee5\u5f80\u9700\u8981\u6383\u63cf\u5927\u578b\u975e\u6a19\u6e96\u5316\u8868\u683c\u7684\u67e5\u8a62\uff0c\u73fe\u5728\u900f\u904e\u9023\u7d50\u8f03\u5c0f\u4e14\u5df2\u7d22\u5f15\u7684\u8868\u683c\u800c\u8b8a\u5f97\u66f4\u5feb\u3002<\/li>\n<li><strong>\u66f4\u65b0\u901f\u5ea6\uff1a<\/strong> \u66f4\u65b0\u5ba2\u6236\u5730\u5740\u73fe\u5728\u53ea\u9700\u5728 <strong>\u5ba2\u6236<\/strong> 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