{"id":64855,"date":"2024-10-14T12:12:31","date_gmt":"2024-10-14T04:12:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/64855\/"},"modified":"2024-10-14T12:12:31","modified_gmt":"2024-10-14T04:12:31","slug":"mssql%ef%bc%9a%e4%b8%8d%e5%86%8d%e5%81%8f%e6%84%9btop%ef%bc%88mssql%e4%b8%8d%e7%94%a8top%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/64855\/","title":{"rendered":"MSSQL\uff1a\u4e0d\u518d\u504f\u611bTOP\uff08mssql\u4e0d\u7528top\uff09"},"content":{"rendered":"<h1 id=\"mssql%ef%bc%9a%e4%b8%8d%e5%86%8d%e5%81%8f%e6%84%9btop%ef%bc%88mssql%e4%b8%8d%e7%94%a8top%ef%bc%89-XqBwpNKNoy\">MSSQL\uff1a\u4e0d\u518d\u504f\u611bTOP\uff08mssql\u4e0d\u7528top\uff09<\/h1>\n<p>\u5728\u4f7f\u7528 Microsoft SQL Server\uff08MSSQL\uff09\u9032\u884c\u6578\u64da\u67e5\u8a62\u6642\uff0c\u8a31\u591a\u958b\u767c\u8005\u7fd2\u6163\u4f7f\u7528 <code>TOP<\/code> \u95dc\u9375\u5b57\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u6578\u91cf\u3002\u96d6\u7136\u9019\u7a2e\u65b9\u6cd5\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>TOP<\/code> \u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u6216\u4e0d\u5fc5\u8981\u7684\u8907\u96dc\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u70ba\u4f55\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u61c9\u8a72\u8003\u616e\u4e0d\u4f7f\u7528 <code>TOP<\/code>\uff0c\u4ee5\u53ca\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n<h2 id=\"top-%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-XqBwpNKNoy\">TOP \u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p><code>TOP<\/code> \u95dc\u9375\u5b57\u7528\u65bc\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u8868\u4e2d\u524d 10 \u884c\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT TOP 10 * FROM Employees;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5728\u9700\u8981\u5feb\u901f\u7372\u53d6\u5c11\u91cf\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u4e5f\u6709\u5176\u5c40\u9650\u6027\u3002<\/p>\n<h2 id=\"top-%e7%9a%84%e6%bd%9b%e5%9c%a8%e5%95%8f%e9%a1%8c-XqBwpNKNoy\">TOP \u7684\u6f5b\u5728\u554f\u984c<\/h2>\n<h3 id=\"%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-XqBwpNKNoy\">\u6027\u80fd\u554f\u984c<\/h3>\n<p>\u4f7f\u7528 <code>TOP<\/code> \u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002\u7576\u67e5\u8a62\u7684\u6578\u64da\u91cf\u5f88\u5927\u6642\uff0cSQL Server \u4ecd\u7136\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\u4ee5\u627e\u5230\u524d N \u884c\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u5fc5\u8981\u7684\u8cc7\u6e90\u6d88\u8017\u3002<\/p>\n<h3 id=\"%e4%b8%8d%e7%a9%a9%e5%ae%9a%e7%9a%84%e7%b5%90%e6%9e%9c-XqBwpNKNoy\">\u4e0d\u7a69\u5b9a\u7684\u7d50\u679c<\/h3>\n<p>\u5982\u679c\u6c92\u6709\u660e\u78ba\u7684\u6392\u5e8f\uff0c\u4f7f\u7528 <code>TOP<\/code> \u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u7a69\u5b9a\u7684\u7d50\u679c\u3002\u4e0d\u540c\u7684\u57f7\u884c\u8a08\u5283\u53ef\u80fd\u6703\u8fd4\u56de\u4e0d\u540c\u7684\u884c\uff0c\u9019\u5728\u9700\u8981\u4e00\u81f4\u6027\u7d50\u679c\u7684\u60c5\u6cc1\u4e0b\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\u3002<\/p>\n<h2 id=\"%e6%9b%bf%e4%bb%a3%e6%96%b9%e6%a1%88-XqBwpNKNoy\">\u66ff\u4ee3\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u907f\u514d\u4e0a\u8ff0\u554f\u984c\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\u4f86\u9650\u5236\u67e5\u8a62\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u898b\u7684\u66ff\u4ee3\u65b9\u6848\uff1a<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-row_number-%e5%87%bd%e6%95%b8-XqBwpNKNoy\">\u4f7f\u7528 ROW_NUMBER() \u51fd\u6578<\/h3>\n<p>\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \u51fd\u6578\u53ef\u4ee5\u70ba\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u552f\u4e00\u7684\u5e8f\u865f\uff0c\u7136\u5f8c\u6839\u64da\u9019\u500b\u5e8f\u865f\u4f86\u7be9\u9078\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH RankedEmployees AS (\n    SELECT *, ROW_NUMBER() OVER (ORDER BY Salary DESC) AS RowNum\n    FROM Employees\n)\nSELECT * FROM RankedEmployees WHERE RowNum &lt;= 10;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u4e0d\u50c5\u80fd\u5920\u9650\u5236\u7d50\u679c\u6578\u91cf\uff0c\u9084\u80fd\u78ba\u4fdd\u7d50\u679c\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-offset-fetch-%e5%ad%90%e5%8f%a5-XqBwpNKNoy\">\u4f7f\u7528 OFFSET-FETCH \u5b50\u53e5<\/h3>\n<p>\u5728 SQL Server 2012 \u53ca\u4ee5\u5f8c\u7684\u7248\u672c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>OFFSET-FETCH<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u5206\u9801\u67e5\u8a62\u3002\u9019\u6a23\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u63a7\u5236\u67e5\u8a62\u7d50\u679c\uff1a<\/p>\n<pre><code>SELECT * FROM Employees\nORDER BY Salary DESC\nOFFSET 0 ROWS FETCH NEXT 10 ROWS ONLY;<\/code><\/pre>\n<p>\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u80fd\u5920\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u9084\u80fd\u5920\u6839\u64da\u9700\u8981\u9032\u884c\u5206\u9801\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-XqBwpNKNoy\">\u7d50\u8ad6<\/h2>\n<p>\u96d6\u7136 <code>TOP<\/code> \u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u4ecd\u7136\u6709\u5176\u7528\u8655\uff0c\u4f46\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6216\u9700\u8981\u7a69\u5b9a\u7d50\u679c\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528 <code>ROW_NUMBER()<\/code> \u6216 <code>OFFSET-FETCH<\/code> \u7b49\u66ff\u4ee3\u65b9\u6848\u6703\u66f4\u70ba\u5408\u9069\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u9084\u80fd\u78ba\u4fdd\u7d50\u679c\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<p>\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u9078\u64c7 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u4e86\u89e3\u5982\u4f55\u512a\u5316\u6578\u64da\u67e5\u8a62\u90fd\u662f\u63d0\u5347\u696d\u52d9\u6548\u7387\u7684\u95dc\u9375\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MSSQL\u4e2d\u4e0d\u518d\u504f\u611bTOP\u7684\u66ff\u4ee3\u65b9\u6848\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u9748\u6d3b\u6027\uff0c\u8b93\u6578\u64da\u64cd\u4f5c\u66f4\u9ad8\u6548\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-64855","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=64855"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64855\/revisions"}],"predecessor-version":[{"id":64856,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/64855\/revisions\/64856"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=64855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=64855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=64855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}