{"id":179700,"date":"2024-11-09T04:04:20","date_gmt":"2024-11-08T20:04:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179700\/"},"modified":"2024-11-09T04:04:20","modified_gmt":"2024-11-08T20:04:20","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-server-%e4%b8%ad%e5%af%a6%e7%8f%be%e5%88%97%e7%9a%84%e5%90%88%e4%bd%b5%ef%bc%88sqlserver-%e5%88%97%e5%90%88%e4%bd%b5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179700\/","title":{"rendered":"\u5982\u4f55\u5728 SQL Server \u4e2d\u5be6\u73fe\u5217\u7684\u5408\u4f75\uff08sqlserver \u5217\u5408\u4f75\uff09"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-server-%e4%b8%ad%e5%af%a6%e7%8f%be%e5%88%97%e7%9a%84%e5%90%88%e4%bd%b5%ef%bc%88sqlserver-%e5%88%97%e5%90%88%e4%bd%b5%ef%bc%89-YxRvJVMACp\">\u5982\u4f55\u5728 SQL Server \u4e2d\u5be6\u73fe\u5217\u7684\u5408\u4f75\uff08sqlserver \u5217\u5408\u4f75\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u5408\u4f75\u5217\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5c07\u591a\u500b\u5217\u7684\u6578\u64da\u6574\u5408\u70ba\u4e00\u500b\u5217\u7684\u60c5\u6cc1\u4e0b\u3002\u9019\u5728\u5831\u544a\u751f\u6210\u3001\u6578\u64da\u6e05\u7406\u548c\u6578\u64da\u5206\u6790\u4e2d\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 SQL Server \u4e2d\u5be6\u73fe\u5217\u7684\u5408\u4f75\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e5%90%88%e4%bd%b5%e5%88%97%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-YxRvJVMACp\">\u5408\u4f75\u5217\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u5408\u4f75\u5217\u901a\u5e38\u662f\u6307\u5c07\u591a\u500b\u5217\u7684\u6578\u64da\u5408\u4f75\u70ba\u4e00\u500b\u55ae\u4e00\u7684\u5217\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4f7f\u7528 SQL \u7684\u5b57\u7b26\u4e32\u51fd\u6578\u4f86\u5be6\u73fe\uff0c\u4f8b\u5982 <code>CONCAT<\/code>\u3001<code>+\uff08\u52a0\u865f\uff09<\/code> \u6216 <code>STRING_AGG<\/code>\uff08\u5728 SQL Server 2017 \u53ca\u4ee5\u5f8c\u7248\u672c\u4e2d\u53ef\u7528\uff09\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-concat-%e5%87%bd%e6%95%b8%e5%90%88%e4%bd%b5%e5%88%97-YxRvJVMACp\">\u4f7f\u7528 CONCAT \u51fd\u6578\u5408\u4f75\u5217<\/h2>\n<p><code>CONCAT<\/code> \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u65b9\u4fbf\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4f86\u5408\u4f75\u591a\u500b\u5b57\u7b26\u4e32\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CONCAT(string1, string2, ...)<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 <code>CONCAT<\/code> \u51fd\u6578\u5408\u4f75\u5169\u500b\u5217\uff1a<\/p>\n<pre><code>SELECT CONCAT(FirstName, ' ', LastName) AS FullName\nFROM Employees;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07 <code>FirstName<\/code> \u548c <code>LastName<\/code> \u5217\u5408\u4f75\u70ba\u4e00\u500b\u540d\u70ba <code>FullName<\/code> \u7684\u65b0\u5217\uff0c\u4e26\u5728\u5169\u8005\u4e4b\u9593\u6dfb\u52a0\u4e86\u4e00\u500b\u7a7a\u683c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%8a%a0%e8%99%9f%ef%bc%88%ef%bc%89%e9%81%8b%e7%ae%97%e7%ac%a6%e5%90%88%e4%bd%b5%e5%88%97-YxRvJVMACp\">\u4f7f\u7528\u52a0\u865f\uff08+\uff09\u904b\u7b97\u7b26\u5408\u4f75\u5217<\/h2>\n<p>\u9664\u4e86 <code>CONCAT<\/code> \u51fd\u6578\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u52a0\u865f\uff08+\uff09\u904b\u7b97\u7b26\u4f86\u5408\u4f75\u5b57\u7b26\u4e32\u3002\u9019\u7a2e\u65b9\u6cd5\u5728 SQL Server \u4e2d\u4e5f\u975e\u5e38\u5e38\u898b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u52a0\u865f\u904b\u7b97\u7b26\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT FirstName + ' ' + LastName AS FullName\nFROM Employees;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u7684\u529f\u80fd\u8207\u524d\u9762\u7684 <code>CONCAT<\/code> \u793a\u4f8b\u76f8\u540c\uff0c\u6700\u7d42\u7d50\u679c\u90fd\u662f\u751f\u6210\u4e00\u500b\u5b8c\u6574\u7684\u59d3\u540d\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-string_agg-%e5%87%bd%e6%95%b8%e5%90%88%e4%bd%b5%e5%a4%9a%e8%a1%8c%e6%95%b8%e6%93%9a-YxRvJVMACp\">\u4f7f\u7528 STRING_AGG \u51fd\u6578\u5408\u4f75\u591a\u884c\u6578\u64da<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u5408\u4f75\u591a\u884c\u6578\u64da\u5230\u4e00\u500b\u5217\u4e2d\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 <code>STRING_AGG<\/code> \u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u5728 SQL Server 2017 \u53ca\u4ee5\u5f8c\u7248\u672c\u4e2d\u53ef\u7528\uff0c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>STRING_AGG(expression, separator) WITHIN GROUP (ORDER BY order_by_expression)<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 <code>STRING_AGG<\/code> \u51fd\u6578\u4f86\u5408\u4f75\u591a\u884c\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT Department, STRING_AGG(FirstName, ', ') AS Employees\nFROM Employees\nGROUP BY Department;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u59d3\u540d\u5408\u4f75\u70ba\u4e00\u500b\u5b57\u7b26\u4e32\uff0c\u4e26\u7528\u9017\u865f\u5206\u9694\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-YxRvJVMACp\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u5408\u4f75\u5217\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u5408\u4f75\u7684\u5217\u4e0d\u5305\u542b <code>NULL<\/code> \u503c\uff0c\u56e0\u70ba\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6700\u7d42\u7d50\u679c\u70ba <code>NULL<\/code>\u3002\u53ef\u4ee5\u4f7f\u7528 <code>ISNULL<\/code> \u6216 <code>COALESCE<\/code> \u51fd\u6578\u4f86\u8655\u7406\u9019\u4e9b\u60c5\u6cc1\u3002<\/li>\n<li>\u8003\u616e\u5408\u4f75\u5f8c\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\uff0c\u907f\u514d\u8d85\u904e SQL Server \u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u9650\u5236\u3002<\/li>\n<li>\u5728\u5408\u4f75\u5927\u91cf\u6578\u64da\u6642\uff0c\u6ce8\u610f\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u9032\u884c\u64cd\u4f5c\u6642\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-YxRvJVMACp\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u5408\u4f75\u5217\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u6cd5\u5be6\u73fe\uff0c\u5305\u62ec\u4f7f\u7528 <code>CONCAT<\/code> \u51fd\u6578\u3001\u52a0\u865f\u904b\u7b97\u7b26\u548c <code>STRING_AGG<\/code> \u51fd\u6578\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u8b80\u6027\uff0c\u9084\u80fd\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\u63d0\u4f9b\u66f4\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u670d\u52a1\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL Server \u4e2d\u5be6\u73fe\u5217\u7684\u5408\u4f75\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u64cd\u4f5c\uff0c\u512a\u5316\u6578\u64da\u5eab\u7ba1\u7406\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-179700","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179700","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=179700"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179700\/revisions"}],"predecessor-version":[{"id":179701,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179700\/revisions\/179701"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179700"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179700"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179700"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}