{"id":141399,"date":"2024-10-31T21:43:29","date_gmt":"2024-10-31T13:43:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/141399\/"},"modified":"2024-10-31T21:43:30","modified_gmt":"2024-10-31T13:43:30","slug":"sql-server-%e4%b8%ad%e5%8f%96%e5%be%97%e6%9f%90%e4%b8%80%e5%88%97%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sqlserver-%e5%8f%96%e5%88%97%e5%80%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/141399\/","title":{"rendered":"SQL Server \u4e2d\u53d6\u5f97\u67d0\u4e00\u5217\u503c\u7684\u65b9\u6cd5\uff08sqlserver \u53d6\u5217\u503c\uff09"},"content":{"rendered":"<h1 id=\"sql-server-%e4%b8%ad%e5%8f%96%e5%be%97%e6%9f%90%e4%b8%80%e5%88%97%e5%80%bc%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%88sqlserver-%e5%8f%96%e5%88%97%e5%80%bc%ef%bc%89-NfbXAsycMO\">SQL Server \u4e2d\u53d6\u5f97\u67d0\u4e00\u5217\u503c\u7684\u65b9\u6cd5\uff08sqlserver \u53d6\u5217\u503c\uff09<\/h1>\n<p>\u5728\u4f7f\u7528 SQL Server \u9032\u884c\u8cc7\u6599\u5eab\u7ba1\u7406\u6642\uff0c\u7d93\u5e38\u9700\u8981\u5f9e\u8cc7\u6599\u8868\u4e2d\u53d6\u5f97\u7279\u5b9a\u5217\u7684\u503c\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5728 SQL Server \u4e2d\u53d6\u5f97\u67d0\u4e00\u5217\u503c\u7684\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u7bc4\u4f8b\uff0c\u4ee5\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u6709\u6548\u5730\u64cd\u4f5c\u8cc7\u6599\u5eab\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e7%9a%84-select-%e8%aa%9e%e5%8f%a5-NfbXAsycMO\">\u57fa\u672c\u7684 SELECT \u8a9e\u53e5<\/h2>\n<p>\u6700\u57fa\u672c\u7684\u65b9\u5f0f\u662f\u4f7f\u7528 <code>SELECT<\/code> \u8a9e\u53e5\u4f86\u53d6\u5f97\u7279\u5b9a\u5217\u7684\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>Employees<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u4e26\u5e0c\u671b\u53d6\u5f97\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\uff1a<\/p>\n<pre><code>SELECT Name FROM Employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de <code>Employees<\/code> \u8cc7\u6599\u8868\u4e2d\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-where-%e5%ad%90%e5%8f%a5%e9%81%8e%e6%bf%be%e7%b5%90%e6%9e%9c-NfbXAsycMO\">\u4f7f\u7528 WHERE \u5b50\u53e5\u904e\u6ffe\u7d50\u679c<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u53ea\u60f3\u53d6\u5f97\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u5217\u503c\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u4f86\u904e\u6ffe\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u53d6\u5f97\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u7684\u54e1\u5de5\u59d3\u540d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT Name FROM Employees WHERE Department = 'Sales';<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u50c5\u8fd4\u56de\u90e8\u9580\u70ba\u300c\u92b7\u552e\u300d\u7684\u54e1\u5de5\u59d3\u540d\u3002<\/p>\n<h2 id=\"%e5%8f%96%e5%be%97%e5%a4%9a%e5%80%8b%e5%88%97%e7%9a%84%e5%80%bc-NfbXAsycMO\">\u53d6\u5f97\u591a\u500b\u5217\u7684\u503c<\/h2>\n<p>\u5982\u679c\u9700\u8981\u540c\u6642\u53d6\u5f97\u591a\u500b\u5217\u7684\u503c\uff0c\u53ef\u4ee5\u5728 <code>SELECT<\/code> \u8a9e\u53e5\u4e2d\u5217\u51fa\u6240\u9700\u7684\u5217\u540d\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u53d6\u5f97\u54e1\u5de5\u7684\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT Name, Email FROM Employees;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-distinct-%e9%97%9c%e9%8d%b5%e5%ad%97-NfbXAsycMO\">\u4f7f\u7528 DISTINCT \u95dc\u9375\u5b57<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u8cc7\u6599\u8868\u4e2d\u53ef\u80fd\u5b58\u5728\u91cd\u8907\u7684\u503c\u3002\u5982\u679c\u5e0c\u671b\u53d6\u5f97\u552f\u4e00\u7684\u5217\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>DISTINCT<\/code> \u95dc\u9375\u5b57\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u53d6\u5f97\u6240\u6709\u4e0d\u540c\u7684\u90e8\u9580\u540d\u7a31\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT DISTINCT Department FROM Employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de\u6240\u6709\u4e0d\u540c\u7684\u90e8\u9580\u540d\u7a31\uff0c\u53bb\u9664\u91cd\u8907\u7684\u9805\u76ee\u3002<\/p>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e7%b5%90%e6%9e%9c-NfbXAsycMO\">\u6392\u5e8f\u7d50\u679c<\/h2>\n<p>\u6709\u6642\u5019\uff0c\u53d6\u5f97\u7684\u5217\u503c\u9700\u8981\u6309\u7167\u7279\u5b9a\u7684\u9806\u5e8f\u6392\u5217\u3002\u53ef\u4ee5\u4f7f\u7528 <code>ORDER BY<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u6309\u7167\u59d3\u540d\u7684\u5b57\u6bcd\u9806\u5e8f\u6392\u5217\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT Name FROM Employees ORDER BY Name ASC;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6309\u59d3\u540d\u5347\u5e8f\u6392\u5217\u7684\u6240\u6709\u54e1\u5de5\u59d3\u540d\u3002<\/p>\n<h2 id=\"%e7%b5%90%e5%90%88%e5%85%b6%e4%bb%96-sql-%e5%87%bd%e6%95%b8-NfbXAsycMO\">\u7d50\u5408\u5176\u4ed6 SQL \u51fd\u6578<\/h2>\n<p>SQL Server \u9084\u63d0\u4f9b\u4e86\u8a31\u591a\u5167\u5efa\u51fd\u6578\uff0c\u53ef\u4ee5\u7528\u4f86\u9032\u4e00\u6b65\u8655\u7406\u53d6\u5f97\u7684\u5217\u503c\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u54e1\u5de5\u7684\u6578\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>COUNT<\/code> \u51fd\u6578\uff1a<\/p>\n<pre><code>SELECT COUNT(*) FROM Employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8fd4\u56de <code>Employees<\/code> \u8cc7\u6599\u8868\u4e2d\u7684\u54e1\u5de5\u7e3d\u6578\u3002<\/p>\n<h2 id=\"%e5%b0%8f%e7%b5%90-NfbXAsycMO\">\u5c0f\u7d50<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53d6\u5f97\u67d0\u4e00\u5217\u503c\u7684\u65b9\u6cd5\u591a\u7a2e\u591a\u6a23\uff0c\u5f9e\u57fa\u672c\u7684 <code>SELECT<\/code> \u8a9e\u53e5\u5230\u4f7f\u7528 <code>WHERE<\/code>\u3001<code>DISTINCT<\/code> \u548c <code>ORDER BY<\/code> \u7b49\u5b50\u53e5\uff0c\u9019\u4e9b\u5de5\u5177\u4f7f\u5f97\u8cc7\u6599\u67e5\u8a62\u8b8a\u5f97\u9748\u6d3b\u800c\u5f37\u5927\u3002\u7121\u8ad6\u662f\u7c21\u55ae\u7684\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u8cc7\u6599\u5206\u6790\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u6280\u5de7\u90fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684 SQL Server \u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u8cc7\u6599\u8655\u7406\u80fd\u529b\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5728 SQL Server \u4e2d\u83b7\u53d6\u7279\u5b9a\u5217\u503c\u7684\u65b9\u6cd5\uff0c\u638c\u63e1\u67e5\u8be2\u6280\u5de7\uff0c\u63d0\u5347\u6570\u636e\u5e93\u64cd\u4f5c\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-141399","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141399","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=141399"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141399\/revisions"}],"predecessor-version":[{"id":141400,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/141399\/revisions\/141400"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=141399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=141399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=141399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}