{"id":187488,"date":"2024-11-11T14:41:25","date_gmt":"2024-11-11T06:41:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187488\/"},"modified":"2024-11-11T14:41:26","modified_gmt":"2024-11-11T06:41:26","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%99%9b%e8%a1%a8%ef%bc%9a%e6%8f%90%e9%ab%98sql%e6%9f%a5%e8%a9%a2%e6%80%a7%e8%83%bd%e7%9a%84%e5%88%a9%e5%99%a8-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%99%9b%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187488\/","title":{"rendered":"\u6578\u64da\u5eab\u865b\u8868\uff1a\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd\u7684\u5229\u5668 (\u6578\u64da\u5eab\u865b\u8868)"},"content":{"rendered":"<h1 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id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e8%99%9b%e8%a1%a8%ef%bc%9f-SmsSGmQcbG\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u865b\u8868\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u865b\u8868\u662f\u4e00\u7a2e\u865b\u64ec\u7684\u8868\u683c\uff0c\u5b83\u4e26\u4e0d\u5be6\u969b\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u57fa\u65bc\u4e00\u500b\u6216\u591a\u500b\u57fa\u790e\u8868\u7684\u67e5\u8a62\u7d50\u679c\u3002\u865b\u8868\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u4e00\u500b\u66f4\u6613\u65bc\u4f7f\u7528\u7684\u6578\u64da\u8996\u5716\u3002\u4f7f\u7528\u865b\u8868\u7684\u4e3b\u8981\u597d\u8655\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7c21\u5316\u67e5\u8a62\uff1a\u865b\u8868\u53ef\u4ee5\u5c07\u8907\u96dc\u7684SQL\u67e5\u8a62\u5c01\u88dd\u8d77\u4f86\uff0c\u4f7f\u7528\u8005\u53ea\u9700\u67e5\u8a62\u865b\u8868\u5373\u53ef\u7372\u5f97\u6240\u9700\u6578\u64da\u3002<\/li>\n<li>\u63d0\u9ad8\u5b89\u5168\u6027\uff1a\u901a\u904e\u865b\u8868\uff0c\u53ef\u4ee5\u9650\u5236\u7528\u6236\u5c0d\u57fa\u790e\u8868\u7684\u76f4\u63a5\u8a2a\u554f\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u5b89\u5168\u6027\u3002<\/li>\n<li>\u6578\u64da\u62bd\u8c61\uff1a\u865b\u8868\u53ef\u4ee5\u63d0\u4f9b\u4e00\u500b\u66f4\u9ad8\u5c64\u6b21\u7684\u6578\u64da\u62bd\u8c61\uff0c\u8b93\u958b\u767c\u8005\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\uff0c\u800c\u4e0d\u662f\u6578\u64da\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%99%9b%e8%a1%a8%e7%9a%84%e6%80%a7%e8%83%bd%e5%84%aa%e5%8b%a2-SmsSGmQcbG\">\u865b\u8868\u7684\u6027\u80fd\u512a\u52e2<\/h2>\n<p>\u96d6\u7136\u865b\u8868\u672c\u8eab\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u4f46\u5b83\u5011\u5728\u67e5\u8a62\u6027\u80fd\u65b9\u9762\u4ecd\u7136\u5177\u6709\u6f5b\u5728\u7684\u512a\u52e2\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u865b\u8868\u5982\u4f55\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd\u7684\u65b9\u5f0f\uff1a<\/p>\n<h3 id=\"1-%e6%b8%9b%e5%b0%91%e6%95%b8%e6%93%9a%e5%82%b3%e8%bc%b8%e9%87%8f-SmsSGmQcbG\">1. \u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf<\/h3>\n<p>\u865b\u8868\u53ef\u4ee5\u901a\u904e\u53ea\u9078\u64c7\u6240\u9700\u7684\u5217\u548c\u884c\u4f86\u6e1b\u5c11\u67e5\u8a62\u7d50\u679c\u7684\u5927\u5c0f\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u7684\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u5305\u542b\u6578\u767e\u842c\u689d\u8a18\u9304\u7684\u7528\u6236\u8868\uff0c\u901a\u904e\u5275\u5efa\u4e00\u500b\u865b\u8868\uff0c\u53ea\u9078\u64c7\u6d3b\u8e8d\u7528\u6236\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u7684\u8ca0\u64d4\u3002<\/p>\n<pre><code>CREATE VIEW ActiveUsers AS\nSELECT id, name, email\nFROM Users\nWHERE status = 'active';\n<\/code><\/pre>\n<h3 id=\"2-%e6%8f%90%e9%ab%98%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%8f%af%e8%ae%80%e6%80%a7-SmsSGmQcbG\">2. \u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027<\/h3>\n<p>\u865b\u8868\u53ef\u4ee5\u4f7f\u67e5\u8a62\u8a9e\u53e5\u66f4\u5177\u53ef\u8b80\u6027\uff0c\u5f9e\u800c\u964d\u4f4e\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002\u958b\u767c\u8005\u53ef\u4ee5\u4f7f\u7528\u865b\u8868\u4f86\u5c01\u88dd\u8907\u96dc\u7684\u908f\u8f2f\uff0c\u8b93\u6700\u7d42\u7684\u67e5\u8a62\u8a9e\u53e5\u66f4\u7c21\u6f54\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM ActiveUsers WHERE email LIKE '%@example.com';\n<\/code><\/pre>\n<h3 id=\"3-%e6%8f%90%e4%be%9b%e6%95%b8%e6%93%9a%e8%81%9a%e5%90%88-SmsSGmQcbG\">3. \u63d0\u4f9b\u6578\u64da\u805a\u5408<\/h3>\n<p>\u865b\u8868\u53ef\u4ee5\u7528\u65bc\u6578\u64da\u805a\u5408\uff0c\u9019\u6a23\u7528\u6236\u53ef\u4ee5\u76f4\u63a5\u67e5\u8a62\u805a\u5408\u7d50\u679c\uff0c\u800c\u4e0d\u5fc5\u6bcf\u6b21\u90fd\u9032\u884c\u8a08\u7b97\u3002\u4f8b\u5982\uff0c\u5275\u5efa\u4e00\u500b\u865b\u8868\u4f86\u986f\u793a\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\uff1a<\/p>\n<pre><code>CREATE VIEW DepartmentCounts AS\nSELECT department_id, COUNT(*) AS employee_count\nFROM Employees\nGROUP BY department_id;\n<\/code><\/pre>\n<h2 id=\"%e8%99%9b%e8%a1%a8%e7%9a%84%e9%99%90%e5%88%b6-SmsSGmQcbG\">\u865b\u8868\u7684\u9650\u5236<\/h2>\n<p>\u5118\u7ba1\u865b\u8868\u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u9650\u5236\u3002\u9996\u5148\uff0c\u865b\u8868\u7684\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u57fa\u790e\u8868\u6578\u64da\u8b8a\u66f4\u7684\u5f71\u97ff\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u5927\u91cf\u66f4\u65b0\u6642\u3002\u6b64\u5916\uff0c\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u5c0d\u865b\u8868\u7684\u652f\u6301\u7a0b\u5ea6\u4e0d\u540c\uff0c\u67d0\u4e9b\u64cd\u4f5c\u53ef\u80fd\u7121\u6cd5\u5728\u865b\u8868\u4e0a\u57f7\u884c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-SmsSGmQcbG\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u865b\u8868\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u63d0\u9ad8SQL\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u7c21\u5316\u67e5\u8a62\u3001\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u548c\u63d0\u4f9b\u6578\u64da\u805a\u5408\uff0c\u865b\u8868\u80fd\u5920\u6709\u6548\u5730\u63d0\u5347\u6578\u64da\u5eab\u7684\u4f7f\u7528\u6548\u7387\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u865b\u8868\u6642\uff0c\u958b\u767c\u8005\u4e5f\u9700\u8003\u616e\u5176\u9650\u5236\uff0c\u4ee5\u78ba\u4fdd\u6700\u4f73\u6027\u80fd\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u865b\u8868\u53ca\u5176\u5728\u9ad8\u6548\u80fd\u74b0\u5883\u4e2d\u7684\u61c9\u7528\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> 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