{"id":187212,"date":"2024-11-11T12:23:18","date_gmt":"2024-11-11T04:23:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187212\/"},"modified":"2024-11-11T12:23:19","modified_gmt":"2024-11-11T04:23:19","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a6%96%e5%9c%96%e7%9a%84%e5%84%aa%e5%8b%a2%e8%88%87%e5%88%a9%e7%9b%8a%e5%a4%a7%e6%8f%ad%e5%af%86-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a6%96%e5%9c%96%e7%9a%84%e5%a5%bd%e8%99%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187212\/","title":{"rendered":"\u6578\u64da\u5eab\u8996\u5716\u7684\u512a\u52e2\u8207\u5229\u76ca\u5927\u63ed\u5bc6 (\u6578\u64da\u5eab\u8996\u5716\u7684\u597d\u8655)"},"content":{"rendered":"

\u6578\u64da\u5eab\u8996\u5716\u7684\u512a\u52e2\u8207\u5229\u76ca\u5927\u63ed\u5bc6 (\u6578\u64da\u5eab\u8996\u5716\u7684\u597d\u8655)<\/h1>\n

\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u5eab\u8996\u5716\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\u3002\u8996\u5716\u662f\u57fa\u65bc\u4e00\u500b\u6216\u591a\u500b\u8868\u7684\u865b\u64ec\u8868\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u4f86\u7c21\u5316\u6578\u64da\u7684\u67e5\u8a62\u548c\u7ba1\u7406\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u8996\u5716\u7684\u512a\u52e2\u8207\u5229\u76ca\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u8996\u5716\uff1f<\/h2>\n

\u6578\u64da\u5eab\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u5b83\u4e26\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u5f9e\u4e00\u500b\u6216\u591a\u500b\u57fa\u790e\u8868\u4e2d\u52d5\u614b\u751f\u6210\u6578\u64da\u3002\u8996\u5716\u53ef\u4ee5\u901a\u904e SQL \u67e5\u8a62\u4f86\u5b9a\u7fa9\uff0c\u4e26\u4e14\u53ef\u4ee5\u50cf\u666e\u901a\u8868\u4e00\u6a23\u9032\u884c\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u8996\u5716\u5275\u5efa\u793a\u4f8b\uff1a<\/p>\n

CREATE VIEW employee_view AS\nSELECT name, department, salary\nFROM employees\nWHERE status = 'active';<\/code><\/pre>\n
\u6578\u64da\u5eab\u8996\u5716\u7684\u512a\u52e2<\/h2>\n
1. \u6578\u64da\u5b89\u5168\u6027<\/h3>\n
\u6578\u64da\u5eab\u8996\u5716\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\u901a\u904e\u8996\u5716\uff0c\u7528\u6236\u53ea\u80fd\u770b\u5230\u4ed6\u5011\u88ab\u6388\u6b0a\u67e5\u770b\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7ba1\u7406\u5c64\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u8996\u5716\uff0c\u53ea\u986f\u793a\u54e1\u5de5\u7684\u59d3\u540d\u548c\u90e8\u9580\uff0c\u800c\u4e0d\u986f\u793a\u85aa\u8cc7\u4fe1\u606f\uff0c\u9019\u6a23\u53ef\u4ee5\u4fdd\u8b77\u654f\u611f\u6578\u64da\u3002<\/p>\n
2. \u7c21\u5316\u67e5\u8a62<\/h3>\n
\u8996\u5716\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u8b93\u7528\u6236\u66f4\u5bb9\u6613\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u7528\u6236\u7121\u9700\u4e86\u89e3\u5e95\u5c64\u6578\u64da\u7d50\u69cb\uff0c\u53ea\u9700\u67e5\u8a62\u8996\u5716\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e00\u500b\u5305\u542b\u591a\u500b\u8868\u7684\u8907\u96dc\u67e5\u8a62\uff0c\u7528\u6236\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u8996\u5716\u4f86\u5c01\u88dd\u9019\u4e9b\u67e5\u8a62\uff0c\u5f9e\u800c\u7c21\u5316\u64cd\u4f5c\uff1a<\/p>\n
CREATE VIEW department_salary AS\nSELECT d.name AS department_name, AVG(e.salary) AS average_salary\nFROM departments d\nJOIN employees e ON d.id = e.department_id\nGROUP BY d.name;<\/code><\/pre>\n
3. \u6578\u64da\u4e00\u81f4\u6027<\/h3>\n
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4. \u63d0\u9ad8\u6027\u80fd<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u8996\u5716\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7279\u5225\u662f\u7576\u8996\u5716\u4f7f\u7528\u4e86\u7d22\u5f15\u6642\uff0c\u67e5\u8a62\u7684\u901f\u5ea6\u53ef\u80fd\u6703\u986f\u8457\u63d0\u9ad8\u3002\u9019\u662f\u56e0\u70ba\u6578\u64da\u5eab\u7cfb\u7d71\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u8996\u5716\u7684\u67e5\u8a62\u904e\u7a0b\u3002<\/p>\n
5. \u6578\u64da\u62bd\u8c61\u5316<\/h3>\n
\u8996\u5716\u63d0\u4f9b\u4e86\u4e00\u7a2e\u6578\u64da\u62bd\u8c61\u5316\u7684\u65b9\u5f0f\uff0c\u8b93\u7528\u6236\u53ef\u4ee5\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\uff0c\u800c\u4e0d\u5fc5\u95dc\u5fc3\u5e95\u5c64\u7684\u6578\u64da\u7d50\u69cb\u3002\u9019\u5c0d\u65bc\u958b\u767c\u4eba\u54e1\u548c\u6578\u64da\u5206\u6790\u5e2b\u4f86\u8aaa\u5c24\u70ba\u91cd\u8981\uff0c\u56e0\u70ba\u4ed6\u5011\u53ef\u4ee5\u901a\u904e\u8996\u5716\u4f86\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\uff0c\u800c\u4e0d\u5fc5\u6df1\u5165\u4e86\u89e3\u6578\u64da\u5eab\u7684\u5177\u9ad4\u5be6\u73fe\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u6578\u64da\u5eab\u8996\u5716\u5728\u6578\u64da\u7ba1\u7406\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u63d0\u4f9b\u4e86\u6578\u64da\u5b89\u5168\u6027\u3001\u67e5\u8a62\u7c21\u5316\u3001\u4e00\u81f4\u6027\u3001\u6027\u80fd\u63d0\u5347\u548c\u6578\u64da\u62bd\u8c61\u5316\u7b49\u591a\u65b9\u9762\u7684\u512a\u52e2\u3002\u7121\u8ad6\u662f\u5728\u4f01\u696d\u6578\u64da\u7ba1\u7406\u9084\u662f\u61c9\u7528\u958b\u767c\u4e2d\uff0c\u5408\u7406\u5229\u7528\u8996\u5716\u90fd\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u548c\u6578\u64da\u5b89\u5168\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u9805\u76ee\u4e2d\u6709\u6548\u5229\u7528\u6578\u64da\u5eab\u8996\u5716\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u9999\u6e2fVPS<\/a> \u548c \u96f2\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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