{"id":167875,"date":"2024-11-06T08:08:17","date_gmt":"2024-11-06T00:08:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/167875\/"},"modified":"2024-11-06T08:08:17","modified_gmt":"2024-11-06T00:08:17","slug":"%e9%8f%88%e6%8e%a5sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%b6%93%e9%a9%97%e7%b8%bd%e7%b5%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/167875\/","title":{"rendered":"\u93c8\u63a5SQL Server\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u4e32\u7d93\u9a57\u7e3d\u7d50"},"content":{"rendered":"<h1 id=\"%e9%8f%88%e6%8e%a5sql-server%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%b6%93%e9%a9%97%e7%b8%bd%e7%b5%90-CSoqnfFESQ\">\u93c8\u63a5SQL Server\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u7b26\u4e32\u7d93\u9a57\u7e3d\u7d50<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL Server\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u696d\u52d9\u5834\u666f\u4e2d\u3002\u7121\u8ad6\u662f\u8655\u7406\u7528\u6236\u6578\u64da\u3001\u4ea4\u6613\u8a18\u9304\u9084\u662f\u65e5\u8a8c\u4fe1\u606f\uff0c\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728SQL Server\u4e2d\u93c8\u63a5\u5b57\u7b26\u4e32\u7684\u7d93\u9a57\u7e3d\u7d50\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%8f%88%e6%8e%a5%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-CSoqnfFESQ\">\u5b57\u7b26\u4e32\u93c8\u63a5\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u5b57\u7b26\u4e32\u93c8\u63a5\u662f\u6307\u5c07\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32\u5408\u4f75\u70ba\u4e00\u500b\u5b57\u7b26\u4e32\u7684\u904e\u7a0b\u3002\u9019\u4e00\u64cd\u4f5c\u901a\u5e38\u4f7f\u7528\u300c+\u300d\u904b\u7b97\u7b26\u6216\u5167\u5efa\u7684\u51fd\u6578\u4f86\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u5b57\u7b26\u4e32\u93c8\u63a5\u793a\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @FirstName NVARCHAR(50) = 'John';\nDECLARE @LastName NVARCHAR(50) = 'Doe';\nDECLARE @FullName NVARCHAR(100);\n\nSET @FullName = @FirstName + ' ' + @LastName;\nSELECT @FullName AS FullName;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5c07\u540d\u548c\u59d3\u9023\u63a5\u8d77\u4f86\uff0c\u4e26\u5728\u5b83\u5011\u4e4b\u9593\u6dfb\u52a0\u4e86\u4e00\u500b\u7a7a\u683c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8concat%e5%87%bd%e6%95%b8%e9%80%b2%e8%a1%8c%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%8f%88%e6%8e%a5-CSoqnfFESQ\">\u4f7f\u7528CONCAT\u51fd\u6578\u9032\u884c\u5b57\u7b26\u4e32\u93c8\u63a5<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528\u300c+\u300d\u904b\u7b97\u7b26\uff0cSQL Server\u9084\u63d0\u4f9b\u4e86CONCAT\u51fd\u6578\u4f86\u9032\u884c\u5b57\u7b26\u4e32\u93c8\u63a5\u3002\u9019\u500b\u51fd\u6578\u7684\u512a\u52e2\u5728\u65bc\u5b83\u53ef\u4ee5\u81ea\u52d5\u8655\u7406NULL\u503c\uff0c\u907f\u514d\u4e86\u5728\u93c8\u63a5\u904e\u7a0b\u4e2d\u51fa\u73fe\u610f\u5916\u7684NULL\u7d50\u679c\u3002<\/p>\n<pre><code>DECLARE @FirstName NVARCHAR(50) = NULL;\nDECLARE @LastName NVARCHAR(50) = 'Smith';\nDECLARE @FullName NVARCHAR(100);\n\nSET @FullName = CONCAT(@FirstName, ' ', @LastName);\nSELECT @FullName AS FullName;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5373\u4f7f@FirstName\u70baNULL\uff0c\u4f7f\u7528CONCAT\u51fd\u6578\u4ecd\u7136\u80fd\u5920\u6b63\u78ba\u8fd4\u56de\u300c Smith\u300d\uff0c\u800c\u4e0d\u6703\u51fa\u73feNULL\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e9%8f%88%e6%8e%a5%e7%9a%84%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-CSoqnfFESQ\">\u5b57\u7b26\u4e32\u93c8\u63a5\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5b57\u7b26\u4e32\u93c8\u63a5\u7684\u6027\u80fd\u53ef\u80fd\u6210\u70ba\u4e00\u500b\u554f\u984c\u3002\u7279\u5225\u662f\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u93c8\u63a5\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u5efa\u8b70\u5728\u4ee5\u4e0b\u60c5\u6cc1\u4e0b\u4f7f\u7528\u5b57\u7b26\u4e32\u93c8\u63a5\uff1a<\/p>\n<ul>\n<li>\u5728SELECT\u8a9e\u53e5\u4e2d\u4f7f\u7528\u6642\uff0c\u76e1\u91cf\u907f\u514d\u5728WHERE\u5b50\u53e5\u4e2d\u9032\u884c\u5b57\u7b26\u4e32\u93c8\u63a5\u3002<\/li>\n<li>\u5c0d\u65bc\u9577\u5b57\u7b26\u4e32\u7684\u93c8\u63a5\uff0c\u8003\u616e\u4f7f\u7528VARCHAR(MAX)\u6216NVARCHAR(MAX)\u985e\u578b\u3002<\/li>\n<li>\u5728\u9700\u8981\u983b\u7e41\u93c8\u63a5\u7684\u60c5\u6cc1\u4e0b\uff0c\u8003\u616e\u5c07\u7d50\u679c\u5b58\u5132\u5728\u4e00\u500b\u81e8\u6642\u8868\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-CSoqnfFESQ\">\u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u5b57\u7b26\u4e32\u93c8\u63a5\u5e38\u7528\u65bc\u751f\u6210\u5831\u544a\u3001\u5275\u5efa\u7528\u6236\u53cb\u597d\u7684\u8f38\u51fa\u4ee5\u53ca\u6578\u64da\u6e05\u7406\u7b49\u5834\u666f\u3002\u4f8b\u5982\uff0c\u5728\u751f\u6210\u5831\u544a\u6642\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u591a\u500b\u5b57\u6bb5\u7684\u503c\u5408\u4f75\u70ba\u4e00\u500b\u63cf\u8ff0\u6027\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre><code>SELECT \n    CONCAT('\u7528\u6236 ', UserID, ' \u7684\u59d3\u540d\u70ba ', FirstName, ' ', LastName) AS UserDescription\nFROM Users;\n<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u751f\u6210\u4e00\u500b\u6613\u65bc\u7406\u89e3\u7684\u7528\u6236\u63cf\u8ff0\uff0c\u65b9\u4fbf\u5f8c\u7e8c\u7684\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CSoqnfFESQ\">\u7e3d\u7d50<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u5b57\u7b26\u4e32\u93c8\u63a5\u662f\u4e00\u9805\u57fa\u672c\u800c\u91cd\u8981\u7684\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u4f7f\u7528\u300c+\u300d\u904b\u7b97\u7b26\u9084\u662fCONCAT\u51fd\u6578\uff0c\u958b\u767c\u8005\u90fd\u61c9\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u3002\u540c\u6642\uff0c\u8003\u616e\u5230\u6027\u80fd\u554f\u984c\uff0c\u61c9\u5728\u5408\u9069\u7684\u5834\u666f\u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32\u93c8\u63a5\uff0c\u4ee5\u78ba\u4fdd\u7cfb\u7d71\u7684\u9ad8\u6548\u904b\u884c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u660e\u667a\u4e4b\u8209\uff0c\u7279\u5225\u662f\u5728\u9999\u6e2f\u5730\u5340\uff0c<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u8cc7\u6e90\u914d\u7f6e\u548c\u7a69\u5b9a\u7684\u670d\u52d9\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7e3d\u7d50\u5728SQL Server\u6578\u64da\u5eab\u4e2d\u93c8\u63a5\u5b57\u7b26\u4e32\u7684\u7d93\u9a57\uff0c\u63d0\u4f9b\u5be6\u7528\u6280\u5de7\u548c\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\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-167875","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167875","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=167875"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167875\/revisions"}],"predecessor-version":[{"id":167876,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/167875\/revisions\/167876"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=167875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=167875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=167875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}