{"id":144001,"date":"2024-11-01T03:02:19","date_gmt":"2024-10-31T19:02:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144001\/"},"modified":"2024-11-01T03:02:20","modified_gmt":"2024-10-31T19:02:20","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%aa%b2%e7%a8%8b%e8%a8%ad%e8%a8%88%ef%bc%9a%e5%af%a6%e6%88%b0%e8%a8%93%e7%b7%b4%e8%aa%b2%e5%a0%82%e9%ab%94%e9%a9%97-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%aa%b2%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144001\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u8ab2\u7a0b\u8a2d\u8a08\uff1a\u5be6\u6230\u8a13\u7df4\u8ab2\u5802\u9ad4\u9a57 (sql \u6578\u64da\u5eab\u8ab2\u7a0b\u8a2d\u8a08)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%aa%b2%e7%a8%8b%e8%a8%ad%e8%a8%88%ef%bc%9a%e5%af%a6%e6%88%b0%e8%a8%93%e7%b7%b4%e8%aa%b2%e5%a0%82%e9%ab%94%e9%a9%97-gybtbplZsJ\">SQL \u6578\u64da\u5eab\u8ab2\u7a0b\u8a2d\u8a08\uff1a\u5be6\u6230\u8a13\u7df4\u8ab2\u5802\u9ad4\u9a57<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u5df2\u6210\u70ba\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\uff0c\u638c\u63e1SQL\u7684\u6280\u80fd\u90fd\u80fd\u986f\u8457\u63d0\u5347\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002\u56e0\u6b64\uff0c\u8a2d\u8a08\u4e00\u500b\u6709\u6548\u7684SQL\u6578\u64da\u5eab\u8ab2\u7a0b\uff0c\u4e26\u63d0\u4f9b\u5be6\u6230\u8a13\u7df4\uff0c\u5c0d\u65bc\u5b78\u7fd2\u8005\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e8%aa%b2%e7%a8%8b%e8%a8%ad%e8%a8%88%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%a6%81%e7%b4%a0-gybtbplZsJ\">\u8ab2\u7a0b\u8a2d\u8a08\u7684\u57fa\u672c\u8981\u7d20<\/h2>\n<p>\u4e00\u500b\u6210\u529f\u7684SQL\u6578\u64da\u5eab\u8ab2\u7a0b\u61c9\u8a72\u5305\u542b\u4ee5\u4e0b\u5e7e\u500b\u57fa\u672c\u8981\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u7406\u8ad6\u57fa\u790e\uff1a<\/strong>\u8ab2\u7a0b\u61c9\u8a72\u5f9eSQL\u7684\u57fa\u672c\u6982\u5ff5\u958b\u59cb\uff0c\u5305\u62ec\u6578\u64da\u5eab\u7684\u7d50\u69cb\u3001\u8868\u7684\u8a2d\u8a08\u3001\u6578\u64da\u985e\u578b\u7b49\u3002<\/li>\n<li><strong>\u5be6\u8e10\u64cd\u4f5c\uff1a<\/strong>\u7406\u8ad6\u77e5\u8b58\u9700\u8981\u901a\u904e\u5be6\u969b\u64cd\u4f5c\u4f86\u978f\u56fa\uff0c\u5b78\u54e1\u61c9\u8a72\u6709\u6a5f\u6703\u5728\u771f\u5be6\u7684\u6578\u64da\u5eab\u74b0\u5883\u4e2d\u9032\u884c\u67e5\u8a62\u548c\u6578\u64da\u64cd\u4f5c\u3002<\/li>\n<li><strong>\u6848\u4f8b\u5206\u6790\uff1a<\/strong>\u901a\u904e\u5206\u6790\u5be6\u969b\u6848\u4f8b\uff0c\u5e6b\u52a9\u5b78\u54e1\u7406\u89e3\u5982\u4f55\u5728\u4e0d\u540c\u60c5\u5883\u4e0b\u61c9\u7528SQL\u3002<\/li>\n<li><strong>\u554f\u984c\u89e3\u6c7a\uff1a<\/strong>\u8a2d\u8a08\u4e00\u4e9b\u6311\u6230\u6027\u554f\u984c\uff0c\u8b93\u5b78\u54e1\u5728\u89e3\u6c7a\u554f\u984c\u7684\u904e\u7a0b\u4e2d\u52a0\u6df1\u5c0dSQL\u7684\u7406\u89e3\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%aa%b2%e7%a8%8b%e5%85%a7%e5%ae%b9%e7%9a%84%e5%85%b7%e9%ab%94%e5%ae%89%e6%8e%92-gybtbplZsJ\">\u8ab2\u7a0b\u5167\u5bb9\u7684\u5177\u9ad4\u5b89\u6392<\/h2>\n<p>\u4e00\u500b\u5178\u578b\u7684SQL\u6578\u64da\u5eab\u8ab2\u7a0b\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6a21\u584a\uff1a<\/p>\n<h3 id=\"1-sql-%e5%9f%ba%e7%a4%8e-gybtbplZsJ\">1. SQL \u57fa\u790e<\/h3>\n<p>\u5728\u9019\u4e00\u6a21\u584a\u4e2d\uff0c\u5b78\u54e1\u5c07\u5b78\u7fd2SQL\u7684\u57fa\u672c\u8a9e\u6cd5\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>SELECT \u8a9e\u53e5\u7684\u4f7f\u7528<\/li>\n<li>WHERE \u5b50\u53e5\u7684\u689d\u4ef6\u7be9\u9078<\/li>\n<li>ORDER BY \u548c GROUP BY \u7684\u6392\u5e8f\u548c\u5206\u7d44\u529f\u80fd<\/li>\n<\/ul>\n<pre><code>SELECT * FROM customers WHERE country = 'Hong Kong' ORDER BY last_name;<\/code><\/pre>\n<h3 id=\"2-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88-gybtbplZsJ\">2. \u6578\u64da\u5eab\u8a2d\u8a08<\/h3>\n<p>\u9019\u4e00\u90e8\u5206\u5c07\u4ecb\u7d39\u5982\u4f55\u8a2d\u8a08\u4e00\u500b\u6709\u6548\u7684\u6578\u64da\u5eab\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u8868\u7684\u8a2d\u8a08\u539f\u5247<\/li>\n<li>\u4e3b\u9375\u548c\u5916\u9375\u7684\u4f7f\u7528<\/li>\n<li>\u6b63\u898f\u5316\u7684\u6982\u5ff5<\/li>\n<\/ul>\n<h3 id=\"3-%e9%ab%98%e7%b4%9a%e6%9f%a5%e8%a9%a2-gybtbplZsJ\">3. \u9ad8\u7d1a\u67e5\u8a62<\/h3>\n<p>\u5b78\u54e1\u5c07\u5b78\u7fd2\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u6280\u8853\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>JOIN \u64cd\u4f5c\u7684\u4f7f\u7528<\/li>\n<li>\u5b50\u67e5\u8a62\u7684\u61c9\u7528<\/li>\n<li>\u805a\u5408\u51fd\u6578\u7684\u4f7f\u7528<\/li>\n<\/ul>\n<pre><code>SELECT orders.order_id, customers.customer_name \nFROM orders \nJOIN customers ON orders.customer_id = customers.customer_id;<\/code><\/pre>\n<h3 id=\"4-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86-gybtbplZsJ\">4. \u6578\u64da\u5eab\u7ba1\u7406<\/h3>\n<p>\u9019\u4e00\u6a21\u584a\u5c07\u6db5\u84cb\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u7dad\u8b77\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u5099\u4efd\u548c\u6062\u5fa9<\/li>\n<li>\u6027\u80fd\u512a\u5316\u6280\u5de7<\/li>\n<li>\u5b89\u5168\u6027\u8a2d\u7f6e<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e6%88%b0%e8%a8%93%e7%b7%b4%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7-gybtbplZsJ\">\u5be6\u6230\u8a13\u7df4\u7684\u5fc5\u8981\u6027<\/h2>\n<p>\u5be6\u6230\u8a13\u7df4\u662f\u5b78\u7fd2SQL\u7684\u95dc\u9375\u90e8\u5206\u3002\u901a\u904e\u5be6\u969b\u64cd\u4f5c\uff0c\u5b78\u54e1\u80fd\u5920\u5c07\u7406\u8ad6\u77e5\u8b58\u61c9\u7528\u5230\u771f\u5be6\u7684\u696d\u52d9\u5834\u666f\u4e2d\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u5b78\u54e1\u7684\u6280\u80fd\u6c34\u5e73\uff0c\u9084\u80fd\u589e\u5f37\u4ed6\u5011\u7684\u81ea\u4fe1\u5fc3\u3002\u5be6\u6230\u8a13\u7df4\u53ef\u4ee5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6a21\u64ec\u771f\u5be6\u696d\u52d9\u5834\u666f\u7684\u9805\u76ee<\/li>\n<li>\u8207\u540c\u5b78\u5408\u4f5c\u89e3\u6c7a\u554f\u984c<\/li>\n<li>\u5b9a\u671f\u7684\u6e2c\u8a66\u548c\u8a55\u4f30<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-gybtbplZsJ\">\u7d50\u8ad6<\/h2>\n<p>\u8a2d\u8a08\u4e00\u500b\u6709\u6548\u7684SQL\u6578\u64da\u5eab\u8ab2\u7a0b\u9700\u8981\u8003\u616e\u591a\u65b9\u9762\u7684\u56e0\u7d20\uff0c\u5305\u62ec\u7406\u8ad6\u57fa\u790e\u3001\u5be6\u8e10\u64cd\u4f5c\u548c\u6848\u4f8b\u5206\u6790\u7b49\u3002\u901a\u904e\u9019\u6a23\u7684\u8ab2\u7a0b\uff0c\u5b78\u54e1\u4e0d\u50c5\u80fd\u5920\u638c\u63e1SQL\u7684\u57fa\u672c\u6280\u80fd\uff0c\u9084\u80fd\u5728\u5be6\u969b\u5de5\u4f5c\u4e2d\u9748\u6d3b\u904b\u7528\u9019\u4e9b\u6280\u80fd\u3002\u5c0d\u65bc\u5e0c\u671b\u5728\u6578\u64da\u7ba1\u7406\u9818\u57df\u767c\u5c55\u7684\u5c08\u696d\u4eba\u58eb\u4f86\u8aaa\uff0c\u53c3\u52a0\u9019\u6a23\u7684\u8ab2\u7a0b\u7121\u7591\u662f\u63d0\u5347\u81ea\u8eab\u7af6\u722d\u529b\u7684\u91cd\u8981\u9014\u5f91\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u6709\u8208\u8da3\uff0c\u4e26\u5e0c\u671b\u7372\u5f97\u66f4\u591a\u7684\u8cc7\u6e90\u548c\u652f\u6301\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a 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