{"id":66231,"date":"2024-10-14T15:40:17","date_gmt":"2024-10-14T07:40:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66231\/"},"modified":"2024-10-14T15:40:17","modified_gmt":"2024-10-14T07:40:17","slug":"mssql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84%e7%a0%b4%e8%ad%af%ef%bc%88mssql%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66231\/","title":{"rendered":"mssql\u6578\u64da\u5eab\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u7834\u8b6f\uff08mssql\u6700\u5f8c\u4e00\u689d\u8a18\u9304\uff09"},"content":{"rendered":"<h1 id=\"mssql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84%e7%a0%b4%e8%ad%af%ef%bc%88mssql%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84%ef%bc%89-uDIxyLuBNM\">MSSQL\u6578\u64da\u5eab\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u7834\u8b6f\uff08MSSQL\u6700\u5f8c\u4e00\u689d\u8a18\u9304\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u4e86\u89e3\u5982\u4f55\u7372\u53d6\u548c\u5206\u6790\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528Microsoft SQL Server\uff08MSSQL\uff09\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728MSSQL\u4e2d\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e7%8d%b2%e5%8f%96%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84%ef%bc%9f-uDIxyLuBNM\">\u70ba\u4ec0\u9ebc\u9700\u8981\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\uff1f<\/h2>\n<p>\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u7684\u9700\u6c42\u901a\u5e38\u51fa\u73fe\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u5be9\u8a08\uff1a\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u3002<\/li>\n<li>\u6578\u64da\u5206\u6790\uff1a\u5206\u6790\u6700\u65b0\u7684\u6578\u64da\u8da8\u52e2\u548c\u8b8a\u5316\u3002<\/li>\n<li>\u932f\u8aa4\u6392\u67e5\uff1a\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u7684\u6839\u6e90\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e7%8d%b2%e5%8f%96%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84-uDIxyLuBNM\">\u5982\u4f55\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u7684\u5e38\u7528\u65b9\u6cd5\u662f\u4f7f\u7528ORDER BY\u5b50\u53e5\u7d50\u5408TOP\u95dc\u9375\u5b57\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT TOP 1 * \nFROM \u8868\u540d \nORDER BY \u4e3b\u9375\u5217 DESC;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>\u8868\u540d<\/code>\u662f\u4f60\u8981\u67e5\u8a62\u7684\u6578\u64da\u8868\uff0c\u800c<code>\u4e3b\u9375\u5217<\/code>\u5247\u662f\u7528\u4f86\u6392\u5e8f\u7684\u5217\uff0c\u901a\u5e38\u662f\u81ea\u589e\u7684ID\u6216\u6642\u9593\u6233\u3002\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u8868\u4e2d\u6700\u65b0\u7684\u4e00\u689d\u8a18\u9304\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-uDIxyLuBNM\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>Orders<\/code>\u7684\u8868\uff0c\u4e26\u4e14\u6211\u5011\u5e0c\u671b\u7372\u53d6\u6700\u65b0\u7684\u4e00\u7b46\u8a02\u55ae\u8a18\u9304\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT TOP 1 * \nFROM Orders \nORDER BY OrderDate DESC;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u6839\u64da<code>OrderDate<\/code>\u5217\u7684\u503c\uff0c\u8fd4\u56de\u6700\u65b0\u7684\u8a02\u55ae\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8cte%e7%8d%b2%e5%8f%96%e6%9c%80%e5%be%8c%e4%b8%80%e6%a2%9d%e8%a8%98%e9%8c%84-uDIxyLuBNM\">\u4f7f\u7528CTE\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528TOP\u95dc\u9375\u5b57\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u516c\u5171\u8868\u8868\u9054\u5f0f\uff08CTE\uff09\u4f86\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u8655\u7406\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n<pre><code>WITH LastOrder AS (\n    SELECT *, ROW_NUMBER() OVER (ORDER BY OrderDate DESC) AS RowNum\n    FROM Orders\n)\nSELECT * \nFROM LastOrder \nWHERE RowNum = 1;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528<code>ROW_NUMBER()<\/code>\u51fd\u6578\u70ba\u6bcf\u4e00\u689d\u8a18\u9304\u5206\u914d\u4e00\u500b\u884c\u865f\uff0c\u7136\u5f8c\u9078\u64c7\u884c\u865f\u70ba1\u7684\u8a18\u9304\uff0c\u5373\u6700\u65b0\u7684\u4e00\u689d\u8a02\u55ae\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-uDIxyLuBNM\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u7372\u53d6\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u6392\u5e8f\u5217\u7684\u552f\u4e00\u6027\uff1a\u5982\u679c\u6392\u5e8f\u5217\u4e2d\u6709\u91cd\u8907\u503c\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u4e0d\u78ba\u5b9a\u7684\u7d50\u679c\u3002<\/li>\n<li>\u6027\u80fd\u8003\u91cf\uff1a\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u57f7\u884c\u9019\u4e9b\u67e5\u8a62\u6642\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u5efa\u8b70\u5c0d\u76f8\u95dc\u5217\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li>\u6578\u64da\u4e00\u81f4\u6027\uff1a\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\uff0c\u7372\u53d6\u7684\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u53ef\u80fd\u6703\u96a8\u8457\u6578\u64da\u7684\u8b8a\u5316\u800c\u8b8a\u52d5\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uDIxyLuBNM\">\u7e3d\u7d50<\/h2>\n<p>\u7372\u53d6MSSQL\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u662f\u4e00\u9805\u57fa\u672c\u4f46\u91cd\u8981\u7684\u6280\u80fd\uff0c\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u9084\u662f\u932f\u8aa4\u6392\u67e5\u4e2d\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u901a\u904e\u4f7f\u7528<code>TOP<\/code>\u95dc\u9375\u5b57\u6216CTE\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684<code>VPS<\/code>\u89e3\u6c7a\u65b9\u6848\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u7834\u8b6fMSSQL\u6578\u64da\u5eab\u4e2d\u7684\u6700\u5f8c\u4e00\u689d\u8a18\u9304\uff0c\u4e86\u89e3\u6578\u64da\u7d50\u69cb\u53ca\u63d0\u53d6\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u80fd\u529b\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-66231","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66231","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=66231"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66231\/revisions"}],"predecessor-version":[{"id":66232,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66231\/revisions\/66232"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}