{"id":64809,"date":"2024-10-14T11:51:25","date_gmt":"2024-10-14T03:51:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/64809\/"},"modified":"2024-10-14T11:51:25","modified_gmt":"2024-10-14T03:51:25","slug":"mssql%e7%9a%84%e5%be%a9%e5%90%88%e7%b4%a2%e5%bc%95%e5%92%8c%e5%8c%85%e5%90%ab%e7%b4%a2%e5%bc%95%e6%9c%89%e5%95%a5%e5%8d%80%e5%88%a5%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/64809\/","title":{"rendered":"MSSQL\u7684\u5fa9\u5408\u7d22\u5f15\u548c\u5305\u542b\u7d22\u5f15\u6709\u5565\u5340\u5225\uff1f"},"content":{"rendered":"<h1 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id=\"%e5%be%a9%e5%90%88%e7%b4%a2%e5%bc%95%e7%9a%84%e7%89%b9%e9%bb%9e-kIptTrmLcP\">\u5fa9\u5408\u7d22\u5f15\u7684\u7279\u9ede<\/h3>\n<ul>\n<li><strong>\u591a\u5217\u652f\u6301\uff1a<\/strong>\u5fa9\u5408\u7d22\u5f15\u53ef\u4ee5\u5305\u542b\u5169\u500b\u6216\u66f4\u591a\u7684\u5217\uff0c\u9019\u4f7f\u5f97\u5b83\u80fd\u5920\u652f\u6301\u8907\u96dc\u7684\u67e5\u8a62\u3002<\/li>\n<li><strong>\u67e5\u8a62\u512a\u5316\uff1a<\/strong>\u7576\u67e5\u8a62\u4e2d\u4f7f\u7528\u4e86\u7d22\u5f15\u4e2d\u7684\u6240\u6709\u5217\u6642\uff0cSQL Server\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u8a72\u7d22\u5f15\u4f86\u6eff\u8db3\u67e5\u8a62\u8981\u6c42\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u6392\u5e8f\u529f\u80fd\uff1a<\/strong>\u5fa9\u5408\u7d22\u5f15\u4e2d\u7684\u5217\u53ef\u4ee5\u7528\u65bc\u6392\u5e8f\uff0c\u9019\u5c0d\u65bc\u9700\u8981\u6392\u5e8f\u7684\u67e5\u8a62\u7279\u5225\u6709\u7528\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%be%a9%e5%90%88%e7%b4%a2%e5%bc%95%e7%9a%84%e7%af%84%e4%be%8b-kIptTrmLcP\">\u5fa9\u5408\u7d22\u5f15\u7684\u7bc4\u4f8b<\/h3>\n<pre><code>CREATE INDEX idx_Composite ON Employees (LastName, FirstName);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5728\u201cEmployees\u201d\u8868\u4e0a\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u201cidx_Composite\u201d\u7684\u5fa9\u5408\u7d22\u5f15\uff0c\u8a72\u7d22\u5f15\u5305\u542b\u201cLastName\u201d\u548c\u201cFirstName\u201d\u5169\u500b\u5217\u3002<\/p>\n<h2 id=\"%e5%8c%85%e5%90%ab%e7%b4%a2%e5%bc%95-kIptTrmLcP\">\u5305\u542b\u7d22\u5f15<\/h2>\n<p>\u5305\u542b\u7d22\u5f15\u662f\u4e00\u7a2e\u7279\u6b8a\u985e\u578b\u7684\u7d22\u5f15\uff0c\u5b83\u5141\u8a31\u5728\u7d22\u5f15\u4e2d\u5305\u542b\u984d\u5916\u7684\u5217\uff0c\u9019\u4e9b\u5217\u4e0d\u53c3\u8207\u7d22\u5f15\u7684\u6392\u5e8f\u6216\u67e5\u8a62\u904e\u6ffe\uff0c\u4f46\u53ef\u4ee5\u5728\u67e5\u8a62\u4e2d\u76f4\u63a5\u8fd4\u56de\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u67e5\u8a62\u6642\u7684\u56de\u8868\u64cd\u4f5c\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<h3 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id=\"%e5%8c%85%e5%90%ab%e7%b4%a2%e5%bc%95%e7%9a%84%e7%af%84%e4%be%8b-kIptTrmLcP\">\u5305\u542b\u7d22\u5f15\u7684\u7bc4\u4f8b<\/h3>\n<pre><code>CREATE INDEX idx_Included ON Employees (LastName) INCLUDE (FirstName, Email);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u201cidx_Included\u201d\u7684\u5305\u542b\u7d22\u5f15\uff0c\u8a72\u7d22\u5f15\u5728\u201cLastName\u201d\u5217\u4e0a\u9032\u884c\u6392\u5e8f\uff0c\u4e26\u5305\u542b\u201cFirstName\u201d\u548c\u201cEmail\u201d\u5169\u500b\u984d\u5916\u7684\u5217\u3002<\/p>\n<h2 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