{"id":187208,"date":"2024-11-11T12:21:19","date_gmt":"2024-11-11T04:21:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187208\/"},"modified":"2024-11-11T12:21:20","modified_gmt":"2024-11-11T04:21:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a6%96%e5%9c%96%e7%9a%84%e5%b1%80%e9%99%90%ef%bc%9a%e7%bc%ba%e5%a4%b1%e7%9a%84%e5%8a%9f%e8%83%bd-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a6%96%e5%9c%96%e4%b8%8d%e5%85%b7%e5%82%99","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187208\/","title":{"rendered":"\u6578\u64da\u5eab\u8996\u5716\u7684\u5c40\u9650\uff1a\u7f3a\u5931\u7684\u529f\u80fd (\u6578\u64da\u5eab\u8996\u5716\u4e0d\u5177\u5099\u7684\u529f\u80fd\u662f)"},"content":{"rendered":"

\u6578\u64da\u5eab\u8996\u5716\u7684\u5c40\u9650\uff1a\u7f3a\u5931\u7684\u529f\u80fd<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u8996\u5716\uff08View\uff09\u662f\u4e00\u7a2e\u865b\u64ec\u8868\u683c\uff0c\u901a\u904e\u67e5\u8a62\u5f9e\u4e00\u500b\u6216\u591a\u500b\u57fa\u790e\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u3002\u8996\u5716\u7684\u4e3b\u8981\u512a\u52e2\u5728\u65bc\u5b83\u5011\u80fd\u5920\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u63d0\u4f9b\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u62bd\u8c61\u5c64\u3002\u7136\u800c\uff0c\u8996\u5716\u4e5f\u5b58\u5728\u4e00\u4e9b\u5c40\u9650\u6027\uff0c\u7279\u5225\u662f\u5728\u529f\u80fd\u65b9\u9762\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6578\u64da\u5eab\u8996\u5716\u7684\u5e7e\u500b\u4e3b\u8981\u5c40\u9650\u6027\u3002<\/p>\n

1. \u4e0d\u652f\u6301\u7d22\u5f15<\/h2>\n

\u8996\u5716\u672c\u8eab\u4e26\u4e0d\u652f\u6301\u7d22\u5f15\uff0c\u9019\u610f\u5473\u8457\u5c0d\u8996\u5716\u7684\u67e5\u8a62\u6027\u80fd\u53ef\u80fd\u4e0d\u5982\u76f4\u63a5\u67e5\u8a62\u57fa\u790e\u8868\u3002\u96d6\u7136\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u7269\u5316\u8996\u5716\uff08Materialized View\uff09\uff0c\u9019\u662f\u4e00\u7a2e\u53ef\u4ee5\u5b58\u5132\u67e5\u8a62\u7d50\u679c\u7684\u8996\u5716\uff0c\u4e26\u4e14\u53ef\u4ee5\u5c0d\u5176\u9032\u884c\u7d22\u5f15\uff0c\u4f46\u9019\u4e26\u4e0d\u9069\u7528\u65bc\u6240\u6709\u60c5\u6cc1\u3002\u7269\u5316\u8996\u5716\u9700\u8981\u984d\u5916\u7684\u5b58\u5132\u7a7a\u9593\uff0c\u4e26\u4e14\u5728\u57fa\u790e\u8868\u6578\u64da\u8b8a\u66f4\u6642\u9700\u8981\u9032\u884c\u66f4\u65b0\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n

2. \u9650\u5236\u7684\u66f4\u65b0\u80fd\u529b<\/h2>\n

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CREATE VIEW employee_view AS\nSELECT employee_id, department_id, COUNT(*)\nFROM employees\nGROUP BY employee_id, department_id;<\/code><\/pre>\n
\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u82e5\u60f3\u66f4\u65b0\u67d0\u500b\u54e1\u5de5\u7684\u90e8\u9580\uff0c\u5fc5\u9808\u76f4\u63a5\u67e5\u8a62\u548c\u66f4\u65b0\u57fa\u790e\u7684 employees<\/code> \u8868\u3002<\/p>\n
3. \u7121\u6cd5\u4f7f\u7528\u67d0\u4e9b SQL \u529f\u80fd<\/h2>\n
\u8996\u5716\u4e0d\u652f\u6301\u6240\u6709 SQL \u529f\u80fd\u3002\u4f8b\u5982\uff0c\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4e0d\u5141\u8a31\u5728\u8996\u5716\u4e2d\u4f7f\u7528 ORDER BY<\/code> \u5b50\u53e5\uff0c\u56e0\u70ba\u8996\u5716\u7684\u76ee\u7684\u662f\u63d0\u4f9b\u4e00\u500b\u975c\u614b\u7684\u6578\u64da\u96c6\uff0c\u800c\u4e0d\u662f\u4e00\u500b\u5177\u9ad4\u7684\u6392\u5e8f\u7d50\u679c\u3002\u7528\u6236\u5fc5\u9808\u5728\u67e5\u8a62\u8996\u5716\u6642\u518d\u6dfb\u52a0\u6392\u5e8f\u689d\u4ef6\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u984d\u5916\u7684\u8907\u96dc\u6027\u3002<\/p>\n
4. \u5b89\u5168\u6027\u548c\u6b0a\u9650\u554f\u984c<\/h2>\n
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5. \u6027\u80fd\u554f\u984c<\/h2>\n
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\u7d50\u8ad6<\/h2>\n
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\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u6211\u5011\u7684 \u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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