{"id":137607,"date":"2024-10-31T12:34:23","date_gmt":"2024-10-31T04:34:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/137607\/"},"modified":"2024-10-31T12:34:24","modified_gmt":"2024-10-31T04:34:24","slug":"sql-server-top%e7%94%a8%e6%b3%95%e5%ae%8c%e5%85%a8%e6%8c%87%e5%bc%95%ef%bc%88sqlserver-top%e7%94%a8%e6%b3%95%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/137607\/","title":{"rendered":"SQL Server TOP\u7528\u6cd5\u5b8c\u5168\u6307\u5f15\uff08sqlserver top\u7528\u6cd5\uff09"},"content":{"rendered":"<h1 id=\"sql-server-top%e7%94%a8%e6%b3%95%e5%ae%8c%e5%85%a8%e6%8c%87%e5%bc%95%ef%bc%88sqlserver-top%e7%94%a8%e6%b3%95%ef%bc%89-WnynHOMHdo\">SQL Server TOP\u7528\u6cd5\u5b8c\u5168\u6307\u5f15\uff08sqlserver top\u7528\u6cd5\uff09<\/h1>\n<p>\u5728\u4f7f\u7528SQL Server\u9032\u884c\u6578\u64da\u67e5\u8a62\u6642\uff0c<code>TOP<\/code>\u95dc\u9375\u5b57\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002\u5b83\u5141\u8a31\u7528\u6236\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\uff0c\u9019\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u7279\u5225\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>TOP<\/code>\u7684\u7528\u6cd5\uff0c\u5305\u62ec\u5176\u57fa\u672c\u8a9e\u6cd5\u3001\u61c9\u7528\u5834\u666f\u4ee5\u53ca\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"1-top%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-WnynHOMHdo\">1. TOP\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c<code>TOP<\/code>\u95dc\u9375\u5b57\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT TOP (number) column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>number<\/code>\u662f\u60a8\u5e0c\u671b\u8fd4\u56de\u7684\u884c\u6578\uff0c<code>column1, column2, ...<\/code>\u662f\u60a8\u8981\u67e5\u8a62\u7684\u5217\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c<code>condition<\/code>\u662f\u53ef\u9078\u7684\u67e5\u8a62\u689d\u4ef6\u3002<\/p>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8top%e9%99%90%e5%88%b6%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-WnynHOMHdo\">2. \u4f7f\u7528TOP\u9650\u5236\u67e5\u8a62\u7d50\u679c<\/h2>\n<p>\u4f7f\u7528<code>TOP<\/code>\u53ef\u4ee5\u8f15\u9b06\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u5f9e\u4e00\u500b\u540d\u70ba<code>Employees<\/code>\u7684\u8868\u4e2d\u7372\u53d6\u524d10\u540d\u85aa\u6c34\u6700\u9ad8\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT TOP (10) *\nFROM Employees\nORDER BY Salary DESC;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u6c34\u6700\u9ad8\u768410\u540d\u54e1\u5de5\uff0c\u4e26\u6309\u7167\u85aa\u6c34\u5f9e\u9ad8\u5230\u4f4e\u7684\u9806\u5e8f\u6392\u5217\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8top%e8%88%87%e7%99%be%e5%88%86%e6%af%94-WnynHOMHdo\">3. \u4f7f\u7528TOP\u8207\u767e\u5206\u6bd4<\/h2>\n<p>\u9664\u4e86\u6307\u5b9a\u5177\u9ad4\u7684\u884c\u6578\u5916\uff0c<code>TOP<\/code>\u9084\u53ef\u4ee5\u8207\u767e\u5206\u6bd4\u4e00\u8d77\u4f7f\u7528\u3002\u9019\u5728\u9700\u8981\u7372\u53d6\u4e00\u5b9a\u6bd4\u4f8b\u7684\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u7372\u53d6\u85aa\u6c34\u6700\u9ad8\u7684\u524d20%\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT TOP (20) PERCENT *\nFROM Employees\nORDER BY Salary DESC;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u6c34\u6700\u9ad8\u768420%\u7684\u54e1\u5de5\uff0c\u4e26\u540c\u6a23\u6309\u7167\u85aa\u6c34\u5f9e\u9ad8\u5230\u4f4e\u7684\u9806\u5e8f\u6392\u5217\u3002<\/p>\n<h2 id=\"4-top%e8%88%87%e5%85%b6%e4%bb%96%e5%ad%90%e5%8f%a5%e7%9a%84%e7%b5%90%e5%90%88%e4%bd%bf%e7%94%a8-WnynHOMHdo\">4. TOP\u8207\u5176\u4ed6\u5b50\u53e5\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c<code>TOP<\/code>\u7d93\u5e38\u8207\u5176\u4ed6SQL\u5b50\u53e5\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982<code>JOIN<\/code>\u3001<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u4f7f\u7528<code>JOIN<\/code>\u6642\u7d50\u5408<code>TOP<\/code>\uff1a<\/p>\n<pre><code>SELECT TOP (5) e.EmployeeID, e.Name, d.DepartmentName\nFROM Employees e\nJOIN Departments d ON e.DepartmentID = d.DepartmentID\nORDER BY e.Salary DESC;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u85aa\u6c34\u6700\u9ad8\u76845\u540d\u54e1\u5de5\u53ca\u5176\u6240\u5c6c\u90e8\u9580\u3002<\/p>\n<h2 id=\"5-%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-WnynHOMHdo\">5. \u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>TOP<\/code>\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li><strong>\u6392\u5e8f\u7684\u91cd\u8981\u6027\uff1a<\/strong>\u4f7f\u7528<code>TOP<\/code>\u6642\uff0c\u901a\u5e38\u9700\u8981\u642d\u914d<code>ORDER BY<\/code>\u5b50\u53e5\uff0c\u5426\u5247\u8fd4\u56de\u7684\u7d50\u679c\u53ef\u80fd\u662f\u96a8\u6a5f\u7684\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u4f7f\u7528<code>TOP<\/code>\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u4ecd\u9700\u6ce8\u610f\u67e5\u8a62\u7684\u6574\u9ad4\u6548\u7387\u3002<\/li>\n<li><strong>\u8207OFFSET FETCH\u7684\u7d50\u5408\uff1a<\/strong>\u5728SQL Server 2012\u53ca\u4ee5\u5f8c\u7684\u7248\u672c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>OFFSET<\/code>\u548c<code>FETCH<\/code>\u4f86\u5be6\u73fe\u66f4\u9748\u6d3b\u7684\u5206\u9801\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WnynHOMHdo\">\u7e3d\u7d50<\/h2>\n<p>\u672c\u6587\u4ecb\u7d39\u4e86SQL Server\u4e2d<code>TOP<\/code>\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5305\u62ec\u5982\u4f55\u9650\u5236\u67e5\u8a62\u7d50\u679c\u7684\u884c\u6578\u3001\u4f7f\u7528\u767e\u5206\u6bd4\u4ee5\u53ca\u8207\u5176\u4ed6SQL\u5b50\u53e5\u7684\u7d50\u5408\u4f7f\u7528\u3002\u638c\u63e1<code>TOP<\/code>\u7684\u7528\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8655\u7406\u6578\u64da\u67e5\u8a62\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u548c\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u670d\u52a1\u5668<\/a>\u90fd\u80fd\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u64f4\u5c55\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL Server\u4e2dTOP\u7684\u7528\u6cd5\uff0c\u638c\u63e1\u5982\u4f55\u9650\u5236\u67e5\u8be2\u7ed3\u679c\uff0c\u63d0\u5347\u6570\u636e\u5904\u7406\u6548\u7387\uff0c\u8f7b\u677e\u7ba1\u7406\u5927\u6570\u636e\u96c6\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-137607","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137607","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=137607"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137607\/revisions"}],"predecessor-version":[{"id":137608,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137607\/revisions\/137608"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=137607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=137607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=137607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}