{"id":190616,"date":"2024-11-12T14:04:22","date_gmt":"2024-11-12T06:04:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/190616\/"},"modified":"2024-11-12T14:04:23","modified_gmt":"2024-11-12T06:04:23","slug":"%e6%88%91%e5%80%91%e8%81%8a%e8%81%8acmu-15445%e4%b9%8b1-relational-model","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/190616\/","title":{"rendered":"\u6211\u5011\u804a\u804aCMU 15445\u4e4b1 Relational Model"},"content":{"rendered":"<h1 id=\"%e6%88%91%e5%80%91%e8%81%8a%e8%81%8acmu-15445%e4%b9%8b1-relational-model-HgXHiqxvIE\">\u6211\u5011\u804a\u804aCMU 15445\u4e4b1 Relational Model<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0c\u95dc\u806f\u6a21\u578b\uff08Relational Model\uff09\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u57fa\u77f3\u4e4b\u4e00\u3002CMU 15445\u4e4b1\u662f\u4e00\u9580\u5c08\u6ce8\u65bc\u95dc\u806f\u6578\u64da\u5eab\u7cfb\u7d71\u7684\u8ab2\u7a0b\uff0c\u65e8\u5728\u5e6b\u52a9\u5b78\u751f\u6df1\u5165\u7406\u89e3\u95dc\u806f\u6a21\u578b\u7684\u7406\u8ad6\u57fa\u790e\u53ca\u5176\u5be6\u969b\u61c9\u7528\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u95dc\u806f\u6a21\u578b\u7684\u57fa\u672c\u6982\u5ff5\u3001\u7279\u6027\u4ee5\u53ca\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e9%97%9c%e8%81%af%e6%a8%a1%e5%9e%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-HgXHiqxvIE\">\u95dc\u806f\u6a21\u578b\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u95dc\u806f\u6a21\u578b\u7531\u57c3\u5fb7\u52a0\u00b7F\u00b7\u79d1\u5fb7\uff08Edgar F. Codd\uff09\u65bc1970\u5e74\u63d0\u51fa\uff0c\u4e3b\u8981\u662f\u5c07\u6578\u64da\u7d44\u7e54\u6210\u8868\u683c\uff08\u6216\u7a31\u70ba\u95dc\u806f\uff09\u7684\u5f62\u5f0f\u3002\u6bcf\u500b\u8868\u683c\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u5176\u4e2d\u884c\u4ee3\u8868\u8a18\u9304\uff08\u6216\u5143\u7d44\uff09\uff0c\u5217\u5247\u4ee3\u8868\u5c6c\u6027\uff08\u6216\u6b04\u4f4d\uff09\u3002\u9019\u7a2e\u7d50\u69cb\u4f7f\u5f97\u6578\u64da\u7684\u5b58\u53d6\u548c\u7ba1\u7406\u8b8a\u5f97\u66f4\u52a0\u76f4\u89c0\u548c\u9ad8\u6548\u3002<\/p>\n<h3 id=\"%e8%a1%a8%e6%a0%bc%e7%9a%84%e7%b5%90%e6%a7%8b-HgXHiqxvIE\">\u8868\u683c\u7684\u7d50\u69cb<\/h3>\n<ul>\n<li><strong>\u884c\uff08Row\uff09<\/strong>: \u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u500b\u7368\u7acb\u7684\u6578\u64da\u5be6\u9ad4\uff0c\u4f8b\u5982\u4e00\u500b\u5ba2\u6236\u6216\u4e00\u500b\u7522\u54c1\u3002<\/li>\n<li><strong>\u5217\uff08Column\uff09<\/strong>: \u6bcf\u4e00\u5217\u4ee3\u8868\u4e00\u500b\u5c6c\u6027\uff0c\u4f8b\u5982\u5ba2\u6236\u7684\u59d3\u540d\u3001\u5730\u5740\u6216\u7522\u54c1\u7684\u50f9\u683c\u3002<\/li>\n<li><strong>\u4e3b\u9375\uff08Primary Key\uff09<\/strong>: \u6bcf\u500b\u8868\u683c\u5fc5\u9808\u6709\u4e00\u500b\u4e3b\u9375\uff0c\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u5916\u9375\uff08Foreign Key\uff09<\/strong>: \u5916\u9375\u7528\u65bc\u5728\u4e0d\u540c\u8868\u683c\u4e4b\u9593\u5efa\u7acb\u95dc\u806f\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%97%9c%e8%81%af%e6%a8%a1%e5%9e%8b%e7%9a%84%e7%89%b9%e6%80%a7-HgXHiqxvIE\">\u95dc\u806f\u6a21\u578b\u7684\u7279\u6027<\/h2>\n<p>\u95dc\u806f\u6a21\u578b\u5177\u6709\u5e7e\u500b\u91cd\u8981\u7279\u6027\uff0c\u4f7f\u5176\u6210\u70ba\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u9996\u9078\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u7368\u7acb\u6027<\/strong>: \u95dc\u806f\u6a21\u578b\u5141\u8a31\u7528\u6236\u5728\u4e0d\u5f71\u97ff\u5176\u4ed6\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u4fee\u6539\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027<\/strong>: \u901a\u904e\u4e3b\u9375\u548c\u5916\u9375\u7684\u7d04\u675f\uff0c\u95dc\u806f\u6a21\u578b\u80fd\u5920\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u9748\u6d3b\u7684\u67e5\u8a62\u80fd\u529b<\/strong>: \u4f7f\u7528\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff08SQL\uff09\uff0c\u7528\u6236\u53ef\u4ee5\u65b9\u4fbf\u5730\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u3002<\/li>\n<\/ul>\n<h3 id=\"sql%e7%9a%84%e6%87%89%e7%94%a8-HgXHiqxvIE\">SQL\u7684\u61c9\u7528<\/h3>\n<p>SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u95dc\u806f\u6a21\u578b\u5bc6\u5207\u76f8\u95dc\u7684\u8a9e\u8a00\uff0c\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u6578\u64da\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684SQL\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT name, address FROM customers WHERE city = 'Hong Kong';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u5f9e\u540d\u70ba\u201ccustomers\u201d\u7684\u8868\u683c\u4e2d\u9078\u64c7\u6240\u6709\u5c45\u4f4f\u5728\u201cHong Kong\u201d\u7684\u5ba2\u6236\u7684\u59d3\u540d\u548c\u5730\u5740\u3002<\/p>\n<h2 id=\"%e9%97%9c%e8%81%af%e6%a8%a1%e5%9e%8b%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-HgXHiqxvIE\">\u95dc\u806f\u6a21\u578b\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u95dc\u806f\u6a21\u578b\u5728\u5404\u7a2e\u61c9\u7528\u4e2d\u5f97\u5230\u4e86\u5ee3\u6cdb\u7684\u4f7f\u7528\uff0c\u5305\u62ec\u4f01\u696d\u8cc7\u6e90\u898f\u5283\uff08ERP\uff09\u3001\u5ba2\u6236\u95dc\u4fc2\u7ba1\u7406\uff08CRM\uff09\u548c\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u7b49\u3002\u9019\u4e9b\u7cfb\u7d71\u4f9d\u8cf4\u65bc\u95dc\u806f\u6578\u64da\u5eab\u4f86\u5b58\u5132\u548c\u7ba1\u7406\u5927\u91cf\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u9ad8\u6548\u7684\u67e5\u8a62\u548c\u5831\u544a\u529f\u80fd\u3002<\/p>\n<h3 id=\"%e6%a1%88%e4%be%8b%e7%a0%94%e7%a9%b6-HgXHiqxvIE\">\u6848\u4f8b\u7814\u7a76<\/h3>\n<p>\u4f8b\u5982\uff0c\u4e00\u5bb6\u96fb\u5b50\u5546\u52d9\u516c\u53f8\u53ef\u80fd\u6703\u4f7f\u7528\u95dc\u806f\u6a21\u578b\u4f86\u7ba1\u7406\u5176\u7522\u54c1\u3001\u5ba2\u6236\u548c\u8a02\u55ae\u6578\u64da\u3002\u901a\u904e\u8a2d\u8a08\u9069\u7576\u7684\u8868\u683c\u548c\u95dc\u806f\uff0c\u8a72\u516c\u53f8\u80fd\u5920\u5feb\u901f\u67e5\u8a62\u5ba2\u6236\u7684\u8cfc\u8cb7\u6b77\u53f2\uff0c\u5206\u6790\u92b7\u552e\u8da8\u52e2\uff0c\u4e26\u512a\u5316\u5eab\u5b58\u7ba1\u7406\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-HgXHiqxvIE\">\u7d50\u8ad6<\/h2>\n<p>\u95dc\u806f\u6a21\u578b\u662f\u6578\u64da\u5eab\u8a2d\u8a08\u7684\u91cd\u8981\u57fa\u790e\uff0c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u3001\u9748\u6d3b\u7684\u65b9\u5f0f\u4f86\u7d44\u7e54\u548c\u7ba1\u7406\u6578\u64da\u3002CMU 15445\u4e4b1\u8ab2\u7a0b\u4e0d\u50c5\u5e6b\u52a9\u5b78\u751f\u7406\u89e3\u9019\u4e00\u6a21\u578b\u7684\u7406\u8ad6\u57fa\u790e\uff0c\u9084\u5f37\u8abf\u4e86\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u6301\u7e8c\u589e\u9577\uff0c\u638c\u63e1\u95dc\u806f\u6a21\u578b\u7684\u77e5\u8b58\u5c07\u5c0d\u672a\u4f86\u7684\u6578\u64da\u7ba1\u7406\u548c\u5206\u6790\u5de5\u4f5c\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a>\u89e3\u6c7a\u65b9\u6848\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u9805\u76ee\u63d0\u4f9b\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22CMU 15445\u4e4b1\u95dc\u65bc\u95dc\u806f\u6a21\u578b\u7684\u8ab2\u7a0b\uff0c\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u8a2d\u8a08\u3001\u67e5\u8a62\u8a9e\u8a00\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-190616","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=190616"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190616\/revisions"}],"predecessor-version":[{"id":190617,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190616\/revisions\/190617"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=190616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=190616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=190616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}