{"id":196141,"date":"2024-11-13T20:49:23","date_gmt":"2024-11-13T12:49:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/196141\/"},"modified":"2024-11-13T20:49:25","modified_gmt":"2024-11-13T12:49:25","slug":"%e6%8e%8c%e6%8f%a1select-top%e8%aa%9e%e5%8f%a5%ef%bc%8c%e8%bc%95%e9%ac%86%e6%93%8d%e4%bd%9c%e6%95%b8%e6%93%9a%e5%ba%ab-select-top%e8%aa%9e%e5%8f%a5-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/196141\/","title":{"rendered":"\u638c\u63e1select top\u8a9e\u53e5\uff0c\u8f15\u9b06\u64cd\u4f5c\u6578\u64da\u5eab (select top\u8a9e\u53e5 \u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e6%8e%8c%e6%8f%a1select-top%e8%aa%9e%e5%8f%a5%ef%bc%8c%e8%bc%95%e9%ac%86%e6%93%8d%e4%bd%9c%e6%95%b8%e6%93%9a%e5%ba%ab-MpLRDJegxo\">\u638c\u63e1SELECT TOP\u8a9e\u53e5\uff0c\u8f15\u9b06\u64cd\u4f5c\u6578\u64da\u5eab<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u5e38\u7528\u7684\u8a9e\u8a00\u4e4b\u4e00\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u6578\u64da\u9084\u662f\u522a\u9664\u6578\u64da\uff0cSQL\u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\u3002\u5176\u4e2d\uff0c<code>SELECT TOP<\/code>\u8a9e\u53e5\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9650\u5236\u67e5\u8a62\u7d50\u679c\u6578\u91cf\u7684\u60c5\u6cc1\u4e0b\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>SELECT TOP<\/code>\u8a9e\u53e5\u7684\u7528\u6cd5\u53ca\u5176\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afselect-top%e8%aa%9e%e5%8f%a5%ef%bc%9f-MpLRDJegxo\">\u4ec0\u9ebc\u662fSELECT TOP\u8a9e\u53e5\uff1f<\/h2>\n<p><code>SELECT TOP<\/code>\u8a9e\u53e5\u662fSQL Server\u4e2d\u7684\u4e00\u500b\u7279\u5b9a\u8a9e\u6cd5\uff0c\u7528\u65bc\u5f9e\u67e5\u8a62\u7d50\u679c\u4e2d\u9078\u64c7\u524d\u5e7e\u689d\u8a18\u9304\u3002\u9019\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u7279\u5225\u6709\u7528\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\uff0c\u800c\u4e0d\u5fc5\u7b49\u5f85\u6574\u500b\u67e5\u8a62\u7d50\u679c\u7684\u8fd4\u56de\u3002<\/p>\n<h2 id=\"select-top%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-MpLRDJegxo\">SELECT TOP\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u57fa\u672c\u7684<code>SELECT TOP<\/code>\u8a9e\u53e5\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\u8fd4\u56de\u7684\u8a18\u9304\u6578\u91cf\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=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-MpLRDJegxo\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>Employees<\/code>\u7684\u6578\u64da\u8868\uff0c\u4e26\u4e14\u6211\u5011\u5e0c\u671b\u67e5\u8a62\u85aa\u6c34\u6700\u9ad8\u7684\u524d\u4e94\u540d\u54e1\u5de5\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TOP (5) EmployeeName, Salary\nFROM Employees\nORDER BY Salary DESC;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>ORDER BY Salary DESC<\/code>\u78ba\u4fdd\u6211\u5011\u6309\u7167\u85aa\u6c34\u5f9e\u9ad8\u5230\u4f4e\u7684\u9806\u5e8f\u6392\u5217\u7d50\u679c\uff0c\u7136\u5f8c<code>SELECT TOP (5)<\/code>\u5c07\u8fd4\u56de\u524d\u4e94\u540d\u85aa\u6c34\u6700\u9ad8\u7684\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8top%e8%aa%9e%e5%8f%a5%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-MpLRDJegxo\">\u4f7f\u7528TOP\u8a9e\u53e5\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u4f7f\u7528<code>SELECT TOP<\/code>\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u56e0\u70ba\u5b83\u6e1b\u5c11\u4e86\u9700\u8981\u8655\u7406\u7684\u6578\u64da\u91cf\u3002<\/li>\n<li><strong>\u8207ORDER BY\u7d50\u5408\u4f7f\u7528\uff1a<\/strong>\u901a\u5e38\uff0c<code>SELECT TOP<\/code>\u8a9e\u53e5\u61c9\u8207<code>ORDER BY<\/code>\u5b50\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u78ba\u4fdd\u8fd4\u56de\u7684\u6578\u64da\u662f\u6709\u610f\u7fa9\u7684\u3002<\/li>\n<li><strong>\u4e0d\u540c\u6578\u64da\u5eab\u7684\u5dee\u7570\uff1a<\/strong>\u96d6\u7136<code>SELECT TOP<\/code>\u5728SQL Server\u4e2d\u4f7f\u7528\uff0c\u4f46\u5728\u5176\u4ed6\u6578\u64da\u5eab\u7cfb\u7d71\uff08\u5982MySQL\uff09\u4e2d\uff0c\u5247\u4f7f\u7528<code>LIMIT<\/code>\u4f86\u9054\u5230\u76f8\u540c\u7684\u6548\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-MpLRDJegxo\">\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u7528\u6cd5\u5916\uff0c<code>SELECT TOP<\/code>\u8a9e\u53e5\u9084\u53ef\u4ee5\u8207\u5176\u4ed6SQL\u529f\u80fd\u7d50\u5408\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528<code>TOP<\/code>\u8a9e\u53e5\u4f86\u7372\u53d6\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT TOP (10) ProductName, Price\nFROM Products\nWHERE Category = 'Electronics'\nORDER BY Price ASC;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u50f9\u683c\u6700\u4f4e\u7684\u524d\u5341\u500b\u96fb\u5b50\u7522\u54c1\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MpLRDJegxo\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1<code>SELECT TOP<\/code>\u8a9e\u53e5\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u8005\u548c\u958b\u767c\u8005\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u5b83\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u6578\u64da\u5206\u6790\u4e2d\uff0c<code>SELECT TOP<\/code>\u90fd\u662f\u4e00\u500b\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n<p>\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\u7684\u6578\u64da\u5eab\u3002\u7121\u8ad6\u662f\u9700\u8981\u9ad8\u6027\u80fd\u7684<a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\u9084\u662f\u7a69\u5b9a\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0cServer.HK\u90fd\u80fd\u63d0\u4f9b\u6eff\u8db3\u60a8\u9700\u6c42\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1SELECT TOP\u8a9e\u53e5\uff0c\u8f15\u9b06\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u6578\u64da\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u64cd\u4f5c\u6d41\u7a0b\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-196141","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196141","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=196141"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196141\/revisions"}],"predecessor-version":[{"id":196142,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/196141\/revisions\/196142"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=196141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=196141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=196141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}