{"id":138883,"date":"2024-10-31T16:04:19","date_gmt":"2024-10-31T08:04:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/138883\/"},"modified":"2024-10-31T16:04:19","modified_gmt":"2024-10-31T08:04:19","slug":"sql-server%e7%8d%b2%e5%be%97%e7%94%a8%e6%88%b6%e6%9c%80%e6%96%b0%e6%88%96%e5%89%8dn%e6%a2%9d%e8%a8%82%e5%96%ae%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e7%b8%bd%e7%b5%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/138883\/","title":{"rendered":"SQL Server\u7372\u5f97\u7528\u6236\u6700\u65b0\u6216\u524dn\u689d\u8a02\u55ae\u7684SQL\u8a9e\u53e5\u7e3d\u7d50"},"content":{"rendered":"<h1 id=\"sql-server%e7%8d%b2%e5%be%97%e7%94%a8%e6%88%b6%e6%9c%80%e6%96%b0%e6%88%96%e5%89%8dn%e6%a2%9d%e8%a8%82%e5%96%ae%e7%9a%84sql%e8%aa%9e%e5%8f%a5%e7%b8%bd%e7%b5%90-DStNCuldJG\">SQL Server\u7372\u5f97\u7528\u6236\u6700\u65b0\u6216\u524dn\u689d\u8a02\u55ae\u7684SQL\u8a9e\u53e5\u7e3d\u7d50<\/h1>\n<p>\u5728\u73fe\u4eca\u7684\u5546\u696d\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u7684\u7ba1\u7406\u548c\u5206\u6790\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u5c0d\u65bc\u8a31\u591a\u4f01\u696d\u4f86\u8aaa\uff0c\u80fd\u5920\u5feb\u901f\u7372\u53d6\u7528\u6236\u7684\u6700\u65b0\u8a02\u55ae\u6216\u524dn\u689d\u8a02\u55ae\u7684\u6578\u64da\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728SQL Server\u4e2d\u7de8\u5beb\u67e5\u8a62\uff0c\u4ee5\u7372\u5f97\u7528\u6236\u7684\u6700\u65b0\u6216\u524dn\u689d\u8a02\u55ae\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-DStNCuldJG\">\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u7372\u53d6\u7528\u6236\u7684\u8a02\u55ae\u6578\u64da\u901a\u5e38\u6d89\u53ca\u5230\u4f7f\u7528SELECT\u8a9e\u53e5\uff0c\u7d50\u5408ORDER BY\u548cLIMIT\uff08\u6216TOP\uff09\u5b50\u53e5\u3002\u9019\u4e9b\u8a9e\u53e5\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u6839\u64da\u7279\u5b9a\u7684\u689d\u4ef6\u7be9\u9078\u548c\u6392\u5e8f\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%8d%b2%e5%8f%96%e7%94%a8%e6%88%b6%e6%9c%80%e6%96%b0%e8%a8%82%e5%96%ae%e7%9a%84sql%e8%aa%9e%e5%8f%a5-DStNCuldJG\">\u7372\u53d6\u7528\u6236\u6700\u65b0\u8a02\u55ae\u7684SQL\u8a9e\u53e5<\/h2>\n<p>\u8981\u7372\u53d6\u7528\u6236\u7684\u6700\u65b0\u8a02\u55ae\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TOP 1 *\nFROM Orders\nWHERE UserID = @UserID\nORDER BY OrderDate DESC;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86TOP 1\u4f86\u9650\u5236\u7d50\u679c\u53ea\u8fd4\u56de\u6700\u65b0\u7684\u4e00\u689d\u8a02\u55ae\u3002\u901a\u904eWHERE\u5b50\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u6307\u5b9a\u7279\u5b9a\u7684\u7528\u6236ID\uff0c\u4e26\u4f7f\u7528ORDER BY\u5b50\u53e5\u6839\u64da\u8a02\u55ae\u65e5\u671f\u9032\u884c\u964d\u5e8f\u6392\u5e8f\uff0c\u4ee5\u78ba\u4fdd\u6700\u65b0\u7684\u8a02\u55ae\u6392\u5728\u6700\u524d\u9762\u3002<\/p>\n<h2 id=\"%e7%8d%b2%e5%8f%96%e7%94%a8%e6%88%b6%e5%89%8dn%e6%a2%9d%e8%a8%82%e5%96%ae%e7%9a%84sql%e8%aa%9e%e5%8f%a5-DStNCuldJG\">\u7372\u53d6\u7528\u6236\u524dn\u689d\u8a02\u55ae\u7684SQL\u8a9e\u53e5<\/h2>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u7372\u53d6\u7528\u6236\u7684\u524dn\u689d\u8a02\u55ae\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT TOP @n *\nFROM Orders\nWHERE UserID = @UserID\nORDER BY OrderDate DESC;<\/code><\/pre>\n<p>\u9019\u88e1\u7684@UserID\u548c@n\u90fd\u662f\u53c3\u6578\uff0c\u5206\u5225\u4ee3\u8868\u7528\u6236ID\u548c\u5e0c\u671b\u7372\u53d6\u7684\u8a02\u55ae\u6578\u91cf\u3002\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6307\u5b9a\u7528\u6236\u7684\u6700\u65b0n\u689d\u8a02\u55ae\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8cte%e7%8d%b2%e5%8f%96%e7%94%a8%e6%88%b6%e7%9a%84%e5%89%8dn%e6%a2%9d%e8%a8%82%e5%96%ae-DStNCuldJG\">\u4f7f\u7528CTE\u7372\u53d6\u7528\u6236\u7684\u524dn\u689d\u8a02\u55ae<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528TOP\u5b50\u53e5\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u5229\u7528\u516c\u7528\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u4f86\u7372\u53d6\u7528\u6236\u7684\u524dn\u689d\u8a02\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>WITH UserOrders AS (\n    SELECT *,\n           ROW_NUMBER() OVER (PARTITION BY UserID ORDER BY OrderDate DESC) AS RowNum\n    FROM Orders\n)\nSELECT *\nFROM UserOrders\nWHERE UserID = @UserID AND RowNum &lt;= @n;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5275\u5efa\u4e86\u4e00\u500bCTE\uff0c\u4e26\u4f7f\u7528ROW_NUMBER()\u51fd\u6578\u70ba\u6bcf\u689d\u8a02\u55ae\u5206\u914d\u4e00\u500b\u884c\u865f\u3002\u7136\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u884c\u865f\u4f86\u7be9\u9078\u51fa\u524dn\u689d\u8a02\u55ae\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u5b83\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u8655\u7406\u8907\u96dc\u7684\u67e5\u8a62\u9700\u6c42\u3002<\/p>\n<h2 id=\"%e8%80%83%e6%85%ae%e6%80%a7%e8%83%bd-DStNCuldJG\">\u8003\u616e\u6027\u80fd<\/h2>\n<p>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u5728\u8a02\u55ae\u8868\u7684UserID\u548cOrderDate\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u907f\u514d\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li>\u5b9a\u671f\u6e05\u7406\u548c\u7dad\u8b77\u6578\u64da\u5eab\uff0c\u4ee5\u4fdd\u6301\u5176\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-DStNCuldJG\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u7372\u53d6\u7528\u6236\u7684\u6700\u65b0\u6216\u524dn\u689d\u8a02\u55ae\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u901a\u904e\u4f7f\u7528TOP\u5b50\u53e5\u3001CTE\u548cROW_NUMBER()\u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u9748\u6d3b\u5730\u7de8\u5beb\u67e5\u8a62\u4f86\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u4f01\u696d\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\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\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u9078\u64c7\u5408\u9069\u7684\u670d\u52d9\u5668\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u5e36\u4f86\u66f4\u5927\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7e3d\u7d50SQL Server\u67e5\u8a62\u8a9e\u53e5\uff0c\u7372\u53d6\u7528\u6236\u6700\u65b0\u6216\u524dn\u689d\u8a02\u55ae\uff0c\u63d0\u5347\u6578\u64da\u6aa2\u7d22\u6548\u7387\u8207\u6e96\u78ba\u6027\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-138883","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138883","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=138883"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138883\/revisions"}],"predecessor-version":[{"id":138884,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/138883\/revisions\/138884"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=138883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=138883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=138883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}