{"id":186616,"date":"2024-11-11T07:24:23","date_gmt":"2024-11-10T23:24:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186616\/"},"modified":"2024-11-11T07:24:24","modified_gmt":"2024-11-10T23:24:24","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e9%9c%80%e8%a6%81%e5%93%aa%e4%ba%9b%e6%8a%80%e8%83%bd%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e9%9c%80%e8%a6%81%e4%bb%80%e9%ba%bc%e6%8a%80","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186616\/","title":{"rendered":"\u6578\u64da\u5eab\u7ba1\u7406\u9700\u8981\u54ea\u4e9b\u6280\u80fd\uff1f (\u6578\u64da\u5eab\u7ba1\u7406\u9700\u8981\u4ec0\u9ebc\u6280\u80fd)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e9%9c%80%e8%a6%81%e5%93%aa%e4%ba%9b%e6%8a%80%e8%83%bd%ef%bc%9f-sCoFmcNULe\">\u6578\u64da\u5eab\u7ba1\u7406\u9700\u8981\u54ea\u4e9b\u6280\u80fd\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u6210\u70ba\u4e86\u4f01\u696d\u904b\u71df\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u6fc0\u589e\uff0c\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u5c08\u696d\u4eba\u58eb\u7684\u9700\u6c42\u4e5f\u96a8\u4e4b\u4e0a\u5347\u3002\u90a3\u9ebc\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u9700\u8981\u54ea\u4e9b\u6280\u80fd\u5462\uff1f\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e00\u4e3b\u984c\u3002<\/p>\n<h2 id=\"1-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88%e8%88%87%e5%bb%ba%e6%a8%a1-sCoFmcNULe\">1. \u6578\u64da\u5eab\u8a2d\u8a08\u8207\u5efa\u6a21<\/h2>\n<p>\u6578\u64da\u5eab\u8a2d\u8a08\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u57fa\u790e\u3002\u6578\u64da\u5eab\u7ba1\u7406\u8005\u9700\u8981\u5177\u5099\u826f\u597d\u7684\u6578\u64da\u5efa\u6a21\u80fd\u529b\uff0c\u80fd\u5920\u6839\u64da\u696d\u52d9\u9700\u6c42\u8a2d\u8a08\u51fa\u5408\u7406\u7684\u6578\u64da\u7d50\u69cb\u3002\u9019\u5305\u62ec\u7406\u89e3\u5be6\u9ad4\u95dc\u4fc2\u6a21\u578b\uff08ER\u6a21\u578b\uff09\u4ee5\u53ca\u5982\u4f55\u5c07\u5176\u8f49\u63db\u70ba\u5be6\u969b\u7684\u6578\u64da\u5eab\u7d50\u69cb\u3002<\/p>\n<ul>\n<li><strong>\u5be6\u9ad4\u95dc\u4fc2\u6a21\u578b\uff08ER\u6a21\u578b\uff09<\/strong>\uff1a\u9019\u662f\u4e00\u7a2e\u5716\u5f62\u5316\u7684\u6578\u64da\u5efa\u6a21\u6280\u8853\uff0c\u7528\u65bc\u63cf\u8ff0\u6578\u64da\u4e4b\u9593\u7684\u95dc\u4fc2\u3002<\/li>\n<li><strong>\u6b63\u898f\u5316<\/strong>\uff1a\u901a\u904e\u6b63\u898f\u5316\u904e\u7a0b\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u8005\u53ef\u4ee5\u6d88\u9664\u6578\u64da\u5197\u9918\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"2-sql%e8%aa%9e%e8%a8%80%e7%9a%84%e7%86%9f%e7%b7%b4%e6%8e%8c%e6%8f%a1-sCoFmcNULe\">2. SQL\u8a9e\u8a00\u7684\u719f\u7df4\u638c\u63e1<\/h2>\n<p>\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff08SQL\uff09\u662f\u8207\u6578\u64da\u5eab\u4ea4\u4e92\u7684\u4e3b\u8981\u5de5\u5177\u3002\u6578\u64da\u5eab\u7ba1\u7406\u8005\u5fc5\u9808\u719f\u7df4\u638c\u63e1SQL\u8a9e\u8a00\uff0c\u80fd\u5920\u7de8\u5beb\u9ad8\u6548\u7684\u67e5\u8a62\u8a9e\u53e5\u4f86\u6aa2\u7d22\u548c\u64cd\u4f5c\u6578\u64da\u3002<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 18;<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u8005\u9084\u9700\u8981\u4e86\u89e3\u5982\u4f55\u4f7f\u7528SQL\u9032\u884c\u6578\u64da\u7684\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"3-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e5%84%aa%e5%8c%96-sCoFmcNULe\">3. 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