{"id":66411,"date":"2024-10-14T17:17:16","date_gmt":"2024-10-14T09:17:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66411\/"},"modified":"2024-10-14T17:17:16","modified_gmt":"2024-10-14T09:17:16","slug":"mssql%e5%ad%97%e6%ae%b5%e6%93%81%e6%9c%89%e6%9b%b4%e5%a4%9a%e5%af%b6%e8%b2%b4%e4%bf%a1%e6%81%af%ef%bc%88mssql%e5%ad%97%e6%ae%b5%e4%b8%8d%e6%98%af%e7%a9%ba%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66411\/","title":{"rendered":"MSSQL\u5b57\u6bb5\u64c1\u6709\u66f4\u591a\u5bf6\u8cb4\u4fe1\u606f\uff08mssql\u5b57\u6bb5\u4e0d\u662f\u7a7a\uff09"},"content":{"rendered":"<h1 id=\"mssql%e5%ad%97%e6%ae%b5%e6%93%81%e6%9c%89%e6%9b%b4%e5%a4%9a%e5%af%b6%e8%b2%b4%e4%bf%a1%e6%81%af%ef%bc%88mssql%e5%ad%97%e6%ae%b5%e4%b8%8d%e6%98%af%e7%a9%ba%ef%bc%89-vHSyCDLzoq\">MSSQL\u5b57\u6bb5\u64c1\u6709\u66f4\u591a\u5bf6\u8cb4\u4fe1\u606f\uff08MSSQL\u5b57\u6bb5\u4e0d\u662f\u7a7a\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMSSQL\uff08Microsoft SQL Server\uff09\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u7576\u6211\u5011\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u5b57\u6bb5\u7684\u8a2d\u8a08\u81f3\u95dc\u91cd\u8981\uff0c\u7279\u5225\u662f\u5982\u4f55\u8655\u7406\u7a7a\u503c\uff08NULL\uff09\u548c\u975e\u7a7a\u503c\u3002\u672c\u6587\u5c07\u63a2\u8a0eMSSQL\u4e2d\u5b57\u6bb5\u64c1\u6709\u66f4\u591a\u5bf6\u8cb4\u4fe1\u606f\u7684\u60c5\u6cc1\uff0c\u7279\u5225\u662f\u7576\u5b57\u6bb5\u4e0d\u662f\u7a7a\u6642\u6240\u5e36\u4f86\u7684\u512a\u52e2\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%a9%ba%e5%80%bc%e5%92%8c%e9%9d%9e%e7%a9%ba%e5%80%bc-vHSyCDLzoq\">\u4ec0\u9ebc\u662f\u7a7a\u503c\u548c\u975e\u7a7a\u503c<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u7a7a\u503c\uff08NULL\uff09\u8868\u793a\u5b57\u6bb5\u4e2d\u6c92\u6709\u6578\u64da\u3002\u9019\u8207\u96f6\u6216\u7a7a\u5b57\u7b26\u4e32\u4e0d\u540c\uff0c\u56e0\u70baNULL\u8868\u793a\u672a\u77e5\u6216\u672a\u5b9a\u7fa9\u7684\u503c\u3002\u76f8\u5c0d\u5730\uff0c\u975e\u7a7a\u503c\u5247\u8868\u793a\u5b57\u6bb5\u4e2d\u6709\u5be6\u969b\u7684\u6578\u64da\u3002\u7406\u89e3\u9019\u5169\u8005\u4e4b\u9593\u7684\u5340\u5225\u5c0d\u65bc\u6578\u64da\u5eab\u8a2d\u8a08\u548c\u67e5\u8a62\u512a\u5316\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e9%9d%9e%e7%a9%ba%e5%ad%97%e6%ae%b5%e7%9a%84%e5%84%aa%e5%8b%a2-vHSyCDLzoq\">\u975e\u7a7a\u5b57\u6bb5\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5b8c\u6574\u6027\uff1a<\/strong>\u975e\u7a7a\u5b57\u6bb5\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u56e0\u70ba\u5b83\u5011\u5f37\u5236\u8981\u6c42\u5728\u63d2\u5165\u6578\u64da\u6642\u63d0\u4f9b\u6709\u6548\u7684\u503c\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u932f\u8aa4\u548c\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u5728\u67e5\u8a62\u6642\uff0c\u975e\u7a7a\u5b57\u6bb5\u901a\u5e38\u80fd\u63d0\u9ad8\u6027\u80fd\u3002\u56e0\u70ba\u6578\u64da\u5eab\u4e0d\u9700\u8981\u8655\u7406NULL\u503c\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u67e5\u8a62\u7684\u8907\u96dc\u6027\u548c\u57f7\u884c\u6642\u9593\u3002<\/li>\n<li><strong>\u66f4\u597d\u7684\u6578\u64da\u5206\u6790\uff1a<\/strong>\u7576\u5b57\u6bb5\u4e0d\u662f\u7a7a\u6642\uff0c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u7684\u6e96\u78ba\u6027\u6703\u63d0\u9ad8\u3002\u9019\u662f\u56e0\u70ba\u5206\u6790\u5de5\u5177\u53ef\u4ee5\u4f9d\u8cf4\u65bc\u5b8c\u6574\u7684\u6578\u64da\u96c6\uff0c\u800c\u4e0d\u5fc5\u8003\u616e\u7f3a\u5931\u7684\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%a8%ad%e7%bd%ae%e9%9d%9e%e7%a9%ba%e5%ad%97%e6%ae%b5-vHSyCDLzoq\">\u5982\u4f55\u8a2d\u7f6e\u975e\u7a7a\u5b57\u6bb5<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u8a2d\u7f6e\u5b57\u6bb5\u70ba\u975e\u7a7a\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u5275\u5efa\u8868\u6642\u8a2d\u7f6e\u5b57\u6bb5\u70ba\u975e\u7a7a\uff1a<\/p>\n<pre><code>CREATE TABLE Employees (\n    EmployeeID INT PRIMARY KEY,\n    FirstName NVARCHAR(50) NOT NULL,\n    LastName NVARCHAR(50) NOT NULL,\n    Email NVARCHAR(100) NOT NULL\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c<code>FirstName<\/code>\u3001<code>LastName<\/code>\u548c<code>Email<\/code>\u5b57\u6bb5\u90fd\u88ab\u8a2d\u7f6e\u70ba\u975e\u7a7a\uff0c\u9019\u610f\u5473\u8457\u5728\u63d2\u5165\u6578\u64da\u6642\u5fc5\u9808\u63d0\u4f9b\u9019\u4e9b\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e9%9d%9e%e7%a9%ba%e5%ad%97%e6%ae%b5-vHSyCDLzoq\">\u67e5\u8a62\u975e\u7a7a\u5b57\u6bb5<\/h2>\n<p>\u5728\u67e5\u8a62\u6578\u64da\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528<code>IS NOT NULL<\/code>\u689d\u4ef6\u4f86\u904e\u6ffe\u51fa\u975e\u7a7a\u5b57\u6bb5\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u64c1\u6709\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>SELECT * FROM Employees\nWHERE Email IS NOT NULL;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u5feb\u901f\u627e\u5230\u6240\u6709\u64c1\u6709\u6709\u6548\u96fb\u5b50\u90f5\u4ef6\u7684\u54e1\u5de5\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u7528\u6027\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-vHSyCDLzoq\">\u7d50\u8ad6<\/h2>\n<p>\u5728MSSQL\u4e2d\uff0c\u8a2d\u7f6e\u5b57\u6bb5\u70ba\u975e\u7a7a\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u9084\u80fd\u589e\u5f37\u67e5\u8a62\u6027\u80fd\u548c\u6578\u64da\u5206\u6790\u7684\u6e96\u78ba\u6027\u3002\u901a\u904e\u5408\u7406\u8a2d\u8a08\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u6211\u5011\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u8cea\u91cf\u548c\u53ef\u9760\u6027\u3002\u5c0d\u65bc\u5e0c\u671b\u5728\u9999\u6e2f\u5c0b\u627e\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\u7684\u7528\u6236\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5229\u7528MSSQL\u7684\u975e\u7a7a\u5b57\u6bb5\u7279\u6027\u5c07\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u548c<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MSSQL\u5b57\u6bb5\u4e2d\u975e\u7a7a\u6570\u636e\u7684\u4ef7\u503c\uff0c\u63ed\u793a\u9690\u85cf\u7684\u4fe1\u606f\u548c\u6d1e\u5bdf\uff0c\u52a9\u529b\u6570\u636e\u5206\u6790\u4e0e\u51b3\u7b56\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-66411","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66411","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=66411"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66411\/revisions"}],"predecessor-version":[{"id":66412,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66411\/revisions\/66412"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}