{"id":139664,"date":"2024-10-31T19:37:18","date_gmt":"2024-10-31T11:37:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/139664\/"},"modified":"2024-10-31T19:37:18","modified_gmt":"2024-10-31T11:37:18","slug":"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b0%a1%e5%96%ae%e7%9a%84select-top","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/139664\/","title":{"rendered":"SQL Server\u6578\u64da\u5eab\u4e2d\u7c21\u55ae\u7684SELECT TOP"},"content":{"rendered":"<h1 id=\"sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%b0%a1%e5%96%ae%e7%9a%84select-top-teuPWSiHug\">SQL Server\u6578\u64da\u5eab\u4e2d\u7c21\u55ae\u7684SELECT TOP<\/h1>\n<p>\u5728SQL Server\u4e2d\uff0c<code>SELECT TOP<\/code>\u8a9e\u53e5\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u7279\u5b9a\u6578\u91cf\u7684\u8a18\u9304\u3002\u9019\u5c0d\u65bc\u9700\u8981\u5feb\u901f\u67e5\u770b\u6578\u64da\u6216\u9032\u884c\u6578\u64da\u5206\u6790\u7684\u60c5\u6cc1\u7279\u5225\u6709\u7528\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>SELECT TOP<\/code>\u7684\u7528\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"select-top%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-teuPWSiHug\">SELECT TOP\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c<code>SELECT TOP<\/code>\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>\u5728\u9019\u88e1\uff0c<code>number<\/code>\u662f\u60a8\u5e0c\u671b\u63d0\u53d6\u7684\u8a18\u9304\u6578\u91cf\uff0c<code>column1, column2, ...<\/code>\u662f\u60a8\u5e0c\u671b\u67e5\u8a62\u7684\u5217\uff0c<code>table_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c<code>condition<\/code>\u662f\u53ef\u9078\u7684\u904e\u6ffe\u689d\u4ef6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8select-top%e7%9a%84%e7%a4%ba%e4%be%8b-teuPWSiHug\">\u4f7f\u7528SELECT TOP\u7684\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528<code>SELECT TOP<\/code>\u4f86\u67e5\u8a62\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT TOP (5) *\nFROM Employees\nORDER BY Salary DESC;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e<code>Employees<\/code>\u8868\u4e2d\u9078\u64c7\u85aa\u6c34\u6700\u9ad8\u7684\u4e94\u540d\u54e1\u5de5\u3002\u4f7f\u7528<code>ORDER BY<\/code>\u5b50\u53e5\u53ef\u4ee5\u78ba\u4fdd\u6211\u5011\u7372\u5f97\u7684\u8a18\u9304\u662f\u6309\u7167\u85aa\u6c34\u964d\u5e8f\u6392\u5217\u7684\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8top%e8%88%87%e7%99%be%e5%88%86%e6%af%94-teuPWSiHug\">\u4f7f\u7528TOP\u8207\u767e\u5206\u6bd4<\/h2>\n<p>\u9664\u4e86\u6307\u5b9a\u5177\u9ad4\u7684\u8a18\u9304\u6578\u91cf\u5916\uff0c<code>SELECT TOP<\/code>\u9084\u53ef\u4ee5\u4f7f\u7528\u767e\u5206\u6bd4\u4f86\u63d0\u53d6\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT TOP (10) PERCENT *\nFROM Products\nORDER BY Price ASC;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u50f9\u683c\u6700\u4f4e\u768410%\u7684\u7522\u54c1\u3002\u9019\u5728\u9700\u8981\u5206\u6790\u6578\u64da\u7684\u67d0\u500b\u7279\u5b9a\u7bc4\u570d\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"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-teuPWSiHug\">TOP\u8207\u5176\u4ed6\u5b50\u53e5\u7684\u7d50\u5408\u4f7f\u7528<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c<code>SELECT TOP<\/code>\u7d93\u5e38\u8207\u5176\u4ed6SQL\u5b50\u53e5\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982<code>GROUP BY<\/code>\u548c<code>HAVING<\/code>\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT TOP (3) Department, AVG(Salary) AS AverageSalary\nFROM Employees\nGROUP BY Department\nHAVING AVG(Salary) &gt; 50000\nORDER BY AverageSalary DESC;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u5e73\u5747\u85aa\u6c34\u8d85\u904e50,000\u7684\u90e8\u9580\u4e2d\uff0c\u5e73\u5747\u85aa\u6c34\u6700\u9ad8\u7684\u4e09\u500b\u90e8\u9580\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-teuPWSiHug\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>SELECT TOP<\/code>\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u4e0d\u4f7f\u7528<code>ORDER BY<\/code>\u5b50\u53e5\uff0c\u5247\u8fd4\u56de\u7684\u8a18\u9304\u9806\u5e8f\u662f\u4e0d\u78ba\u5b9a\u7684\u3002<\/li>\n<li>\u5728\u4e0d\u540c\u7684SQL Server\u7248\u672c\u4e2d\uff0c<code>TOP<\/code>\u7684\u884c\u70ba\u53ef\u80fd\u6703\u6709\u6240\u4e0d\u540c\uff0c\u56e0\u6b64\u5efa\u8b70\u5728\u4f7f\u7528\u524d\u67e5\u95b1\u76f8\u95dc\u6587\u6a94\u3002<\/li>\n<li>\u4f7f\u7528<code>TOP<\/code>\u6642\uff0c\u61c9\u8003\u616e\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-teuPWSiHug\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0c<code>SELECT TOP<\/code>\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u63d0\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f\u5f9e\u6578\u64da\u5206\u6790\u7684\u89d2\u5ea6\u9084\u662f\u65e5\u5e38\u67e5\u8a62\u7684\u9700\u6c42\uff0c\u638c\u63e1<code>SELECT TOP<\/code>\u7684\u7528\u6cd5\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u6258\u7ba1\u60a8\u7684SQL Server\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL Server\u4e2dSELECT TOP\u8a9e\u53e5\u7684\u7528\u6cd5\uff0c\u8f15\u9b06\u63d0\u53d6\u6578\u64da\u5eab\u4e2d\u7684\u524d\u5e7e\u689d\u8a18\u9304\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\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-139664","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139664","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=139664"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139664\/revisions"}],"predecessor-version":[{"id":139665,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/139664\/revisions\/139665"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=139664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=139664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=139664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}