{"id":172139,"date":"2024-11-07T10:38:19","date_gmt":"2024-11-07T02:38:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172139\/"},"modified":"2024-11-07T10:38:20","modified_gmt":"2024-11-07T02:38:20","slug":"%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90sql-server%e7%b3%bb%e7%b5%b1%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172139\/","title":{"rendered":"\u5168\u9762\u89e3\u6790SQL Server\u7cfb\u7d71\u51fd\u6578"},"content":{"rendered":"<h1 id=\"%e5%85%a8%e9%9d%a2%e8%a7%a3%e6%9e%90sql-server%e7%b3%bb%e7%b5%b1%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u5168\u9762\u89e3\u6790SQL Server\u7cfb\u7d71\u51fd\u6578<\/h1>\n<p>SQL Server\u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u4f01\u696d\u7d1a\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7cfb\u7d71\u51fd\u6578\u662fSQL Server\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u7d44\u6210\u90e8\u5206\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3001\u6578\u64da\u8f49\u63db\u548c\u6578\u64da\u5206\u6790\u3002\u672c\u6587\u5c07\u5168\u9762\u89e3\u6790SQL Server\u7684\u7cfb\u7d71\u51fd\u6578\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b3%bb%e7%b5%b1%e5%87%bd%e6%95%b8%ef%bc%9f-JMbvwHgSJn\">\u4ec0\u9ebc\u662f\u7cfb\u7d71\u51fd\u6578\uff1f<\/h2>\n<p>\u7cfb\u7d71\u51fd\u6578\u662fSQL Server\u5167\u5efa\u7684\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u5728\u67e5\u8a62\u4e2d\u76f4\u63a5\u4f7f\u7528\uff0c\u7121\u9700\u7528\u6236\u81ea\u5b9a\u7fa9\u3002\u7cfb\u7d71\u51fd\u6578\u901a\u5e38\u7528\u65bc\u6578\u64da\u7684\u8a08\u7b97\u3001\u8f49\u63db\u548c\u67e5\u8a62\uff0c\u4e26\u4e14\u53ef\u4ee5\u8fd4\u56de\u55ae\u4e00\u503c\u6216\u591a\u500b\u503c\u3002\u6839\u64da\u529f\u80fd\u7684\u4e0d\u540c\uff0c\u7cfb\u7d71\u51fd\u6578\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u985e\uff1a<\/p>\n<ul>\n<li><strong id=\"%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u6578\u5b78\u51fd\u6578<\/strong><\/li>\n<li><strong id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u5b57\u7b26\u4e32\u51fd\u6578<\/strong><\/li>\n<li><strong id=\"%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578<\/strong><\/li>\n<li><strong id=\"%e7%b3%bb%e7%b5%b1%e4%bf%a1%e6%81%af%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u7cfb\u7d71\u4fe1\u606f\u51fd\u6578<\/strong><\/li>\n<li><strong id=\"%e8%bd%89%e6%8f%9b%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u8f49\u63db\u51fd\u6578<\/strong><\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u6578\u5b78\u51fd\u6578<\/h2>\n<p>\u6578\u5b78\u51fd\u6578\u7528\u65bc\u57f7\u884c\u6578\u5b78\u8a08\u7b97\u3002\u5e38\u898b\u7684\u6578\u5b78\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>ABS()<\/code>\uff1a\u8fd4\u56de\u6578\u5b57\u7684\u7d55\u5c0d\u503c\u3002<\/li>\n<li><code>CEILING()<\/code>\uff1a\u8fd4\u56de\u5927\u65bc\u6216\u7b49\u65bc\u6307\u5b9a\u6578\u5b57\u7684\u6700\u5c0f\u6574\u6578\u3002<\/li>\n<li><code>FLOOR()<\/code>\uff1a\u8fd4\u56de\u5c0f\u65bc\u6216\u7b49\u65bc\u6307\u5b9a\u6578\u5b57\u7684\u6700\u5927\u6574\u6578\u3002<\/li>\n<li><code>ROUND()<\/code>\uff1a\u8fd4\u56de\u6578\u5b57\u56db\u6368\u4e94\u5165\u5f8c\u7684\u503c\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>ROUND()<\/code>\u51fd\u6578\u4f86\u56db\u6368\u4e94\u5165\u4e00\u500b\u6578\u5b57\uff1a<\/p>\n<pre><code>SELECT ROUND(123.4567, 2) AS RoundedValue;<\/code><\/pre>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u5b57\u7b26\u4e32\u51fd\u6578<\/h2>\n<p>\u5b57\u7b26\u4e32\u51fd\u6578\u7528\u65bc\u8655\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u3002\u5e38\u898b\u7684\u5b57\u7b26\u4e32\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>LEN()<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<li><code>UPPER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb\u3002<\/li>\n<li><code>LOWER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5c0f\u5beb\u3002<\/li>\n<li><code>SUBSTRING()<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>SUBSTRING()<\/code>\u51fd\u6578\u4f86\u63d0\u53d6\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\uff1a<\/p>\n<pre><code>SELECT SUBSTRING('Hello, World!', 1, 5) AS SubstringValue;<\/code><\/pre>\n<h2 id=\"%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578<\/h2>\n<p>\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u7528\u65bc\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u6578\u64da\u3002\u5e38\u898b\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>GETDATE()<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><code>DATEDIFF()<\/code>\uff1a\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002<\/li>\n<li><code>DATEADD()<\/code>\uff1a\u5728\u6307\u5b9a\u7684\u65e5\u671f\u4e0a\u6dfb\u52a0\u4e00\u6bb5\u6642\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>DATEDIFF()<\/code>\u51fd\u6578\u4f86\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\uff1a<\/p>\n<pre><code>SELECT DATEDIFF(DAY, '2023-01-01', '2023-12-31') AS DaysDifference;<\/code><\/pre>\n<h2 id=\"%e7%b3%bb%e7%b5%b1%e4%bf%a1%e6%81%af%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u7cfb\u7d71\u4fe1\u606f\u51fd\u6578<\/h2>\n<p>\u7cfb\u7d71\u4fe1\u606f\u51fd\u6578\u7528\u65bc\u7372\u53d6\u6709\u95dcSQL Server\u5be6\u4f8b\u7684\u7cfb\u7d71\u4fe1\u606f\u3002\u5e38\u898b\u7684\u7cfb\u7d71\u4fe1\u606f\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>@@VERSION<\/code>\uff1a\u8fd4\u56deSQL Server\u7684\u7248\u672c\u4fe1\u606f\u3002<\/li>\n<li><code>@@SERVERNAME<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u4f3a\u670d\u5668\u7684\u540d\u7a31\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>@@VERSION<\/code>\u4f86\u7372\u53d6SQL Server\u7684\u7248\u672c\uff1a<\/p>\n<pre><code>SELECT @@VERSION AS VersionInfo;<\/code><\/pre>\n<h2 id=\"%e8%bd%89%e6%8f%9b%e5%87%bd%e6%95%b8-JMbvwHgSJn\">\u8f49\u63db\u51fd\u6578<\/h2>\n<p>\u8f49\u63db\u51fd\u6578\u7528\u65bc\u5728\u4e0d\u540c\u6578\u64da\u985e\u578b\u4e4b\u9593\u9032\u884c\u8f49\u63db\u3002\u5e38\u898b\u7684\u8f49\u63db\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>CAST()<\/code>\uff1a\u5c07\u4e00\u500b\u6578\u64da\u985e\u578b\u8f49\u63db\u70ba\u53e6\u4e00\u500b\u6578\u64da\u985e\u578b\u3002<\/li>\n<li><code>CONVERT()<\/code>\uff1a\u63d0\u4f9b\u66f4\u9748\u6d3b\u7684\u6578\u64da\u985e\u578b\u8f49\u63db\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>CAST()<\/code>\u51fd\u6578\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u6574\u6578\uff1a<\/p>\n<pre><code>SELECT CAST('123' AS INT) AS ConvertedValue;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JMbvwHgSJn\">\u7e3d\u7d50<\/h2>\n<p>SQL Server\u7684\u7cfb\u7d71\u51fd\u6578\u70ba\u7528\u6236\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u7121\u8ad6\u662f\u5728\u6578\u64da\u8a08\u7b97\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u9084\u662f\u65e5\u671f\u8655\u7406\u65b9\u9762\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u6709\u6548\u5730\u63d0\u9ad8\u958b\u767c\u6548\u7387\u3002\u4e86\u89e3\u548c\u638c\u63e1\u9019\u4e9b\u7cfb\u7d71\u51fd\u6578\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\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\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eSQL Server\u7cfb\u7d71\u51fd\u6578\u7684\u529f\u80fd\u8207\u61c9\u7528\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u8207\u67e5\u8a62\u6027\u80fd\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-172139","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172139","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=172139"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172139\/revisions"}],"predecessor-version":[{"id":172140,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172139\/revisions\/172140"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}