{"id":66313,"date":"2024-10-14T16:24:16","date_gmt":"2024-10-14T08:24:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/66313\/"},"modified":"2024-10-14T16:24:16","modified_gmt":"2024-10-14T08:24:16","slug":"mssql%e4%b8%ad%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88mssql%e5%b8%b8%e7%94%a8%e7%9a%84%e5%87%bd%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/66313\/","title":{"rendered":"MSSQL\u4e2d\u5e38\u7528\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff08mssql\u5e38\u7528\u7684\u51fd\u6578\uff09"},"content":{"rendered":"<h1 id=\"mssql%e4%b8%ad%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e7%9a%84%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%ef%bc%88mssql%e5%b8%b8%e7%94%a8%e7%9a%84%e5%87%bd%e6%95%b8%ef%bc%89-eNyokaFaco\">MSSQL\u4e2d\u5e38\u7528\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff08mssql\u5e38\u7528\u7684\u51fd\u6578\uff09<\/h1>\n<p>\u5728\u4f7f\u7528Microsoft SQL Server\uff08MSSQL\uff09\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u548c\u67e5\u8a62\u6642\uff0c\u4e86\u89e3\u5e38\u7528\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5728MSSQL\u4e2d\u5e38\u7528\u7684\u51fd\u6578\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"1-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-eNyokaFaco\">1. \u5b57\u7b26\u4e32\u51fd\u6578<\/h2>\n<p>\u5b57\u7b26\u4e32\u51fd\u6578\u7528\u65bc\u8655\u7406\u548c\u64cd\u4f5c\u5b57\u7b26\u4e32\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u51fd\u6578\uff1a<\/p>\n<ul>\n<li><code>LEN()<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<li><code>SUBSTRING()<\/code>\uff1a\u5f9e\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>REPLACE()<\/code>\uff1a\u66ff\u63db\u5b57\u7b26\u4e32\u4e2d\u7684\u6307\u5b9a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-eNyokaFaco\">\u793a\u4f8b<\/h3>\n<pre><code>\n-- \u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\nSELECT LEN('Hello World') AS StringLength;\n\n-- \u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\nSELECT SUBSTRING('Hello World', 1, 5) AS SubString;\n\n-- \u66ff\u63db\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\nSELECT REPLACE('Hello World', 'World', 'MSSQL') AS ReplacedString;\n<\/code><\/pre>\n<h2 id=\"2-%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8-eNyokaFaco\">2. \u6578\u5b78\u51fd\u6578<\/h2>\n<p>\u6578\u5b78\u51fd\u6578\u7528\u65bc\u57f7\u884c\u6578\u5b78\u8a08\u7b97\u3002\u5e38\u7528\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>ROUND()<\/code>\uff1a\u5c0d\u6578\u5b57\u9032\u884c\u56db\u6368\u4e94\u5165\u3002<\/li>\n<li><code>POWER()<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u7684\u51aa\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-eNyokaFaco\">\u793a\u4f8b<\/h3>\n<pre><code>\n-- \u8fd4\u56de\u6578\u5b57\u7684\u7d55\u5c0d\u503c\nSELECT ABS(-10) AS AbsoluteValue;\n\n-- \u56db\u6368\u4e94\u5165\nSELECT ROUND(123.4567, 2) AS RoundedValue;\n\n-- \u8a08\u7b97\u51aa\nSELECT POWER(2, 3) AS PowerValue;\n<\/code><\/pre>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-eNyokaFaco\">3. \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\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\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\u6642\u9593\u9593\u9694\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-eNyokaFaco\">\u793a\u4f8b<\/h3>\n<pre><code>\n-- \u8fd4\u56de\u7576\u524d\u65e5\u671f\u548c\u6642\u9593\nSELECT GETDATE() AS CurrentDateTime;\n\n-- \u8a08\u7b97\u65e5\u671f\u5dee\u7570\nSELECT DATEDIFF(DAY, '2023-01-01', '2023-10-01') AS DateDifference;\n\n-- \u5728\u65e5\u671f\u4e0a\u6dfb\u52a0\u6642\u9593\u9593\u9694\nSELECT DATEADD(DAY, 10, '2023-10-01') AS NewDate;\n<\/code><\/pre>\n<h2 id=\"4-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-eNyokaFaco\">4. \u805a\u5408\u51fd\u6578<\/h2>\n<p>\u805a\u5408\u51fd\u6578\u7528\u65bc\u5c0d\u6578\u64da\u9032\u884c\u8a08\u7b97\uff0c\u4e26\u8fd4\u56de\u55ae\u4e00\u503c\u3002\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>SUM()<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG()<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>COUNT()<\/code>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b-eNyokaFaco\">\u793a\u4f8b<\/h3>\n<pre><code>\n-- \u8a08\u7b97\u7e3d\u548c\nSELECT SUM(Salary) AS TotalSalary FROM Employees;\n\n-- \u8a08\u7b97\u5e73\u5747\u503c\nSELECT AVG(Salary) AS AverageSalary FROM Employees;\n\n-- \u8a08\u7b97\u884c\u6578\nSELECT COUNT(*) AS TotalEmployees FROM Employees;\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-eNyokaFaco\">\u7e3d\u7d50<\/h2>\n<p>\u4e86\u89e3MSSQL\u4e2d\u7684\u5e38\u7528\u51fd\u6578\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u67e5\u8a62\u81f3\u95dc\u91cd\u8981\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u7121\u8ad6\u662f\u5b57\u7b26\u4e32\u8655\u7406\u3001\u6578\u5b78\u8a08\u7b97\u3001\u65e5\u671f\u6642\u9593\u64cd\u4f5c\u9084\u662f\u805a\u5408\u8a08\u7b97\uff0c\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u4f7f\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u66f4\u52a0\u9ad8\u6548\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\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MSSQL\u4e2d\u5e38\u7528\u51fd\u6570\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u63d0\u5347\u6570\u636e\u5e93\u64cd\u4f5c\u6548\u7387\uff0c\u638c\u63e1\u6570\u636e\u5904\u7406\u4e0e\u67e5\u8be2\u6280\u5de7\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-66313","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66313","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=66313"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66313\/revisions"}],"predecessor-version":[{"id":66314,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/66313\/revisions\/66314"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=66313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=66313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=66313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}