{"id":137885,"date":"2024-10-31T12:54:19","date_gmt":"2024-10-31T04:54:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/137885\/"},"modified":"2024-10-31T12:54:19","modified_gmt":"2024-10-31T04:54:19","slug":"sql-server%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%85%a8%e6%8e%a5%e8%a7%b8%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/137885\/","title":{"rendered":"SQL Server\u65e5\u671f\u64cd\u4f5c\u5168\u63a5\u89f8\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b"},"content":{"rendered":"<h1 id=\"sql-server%e6%97%a5%e6%9c%9f%e6%93%8d%e4%bd%9c%e5%85%a8%e6%8e%a5%e8%a7%b8%e7%9a%84%e5%af%a6%e9%9a%9b%e6%93%8d%e4%bd%9c%e6%b5%81%e7%a8%8b-TYNvALBTcT\">SQL Server\u65e5\u671f\u64cd\u4f5c\u5168\u63a5\u89f8\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL Server\u4e2d\u65e5\u671f\u64cd\u4f5c\u7684\u5be6\u969b\u64cd\u4f5c\u6d41\u7a0b\uff0c\u5305\u62ec\u65e5\u671f\u7684\u683c\u5f0f\u5316\u3001\u8a08\u7b97\u3001\u6bd4\u8f03\u7b49\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u7bc4\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"1-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-TYNvALBTcT\">1. \u65e5\u671f\u548c\u6642\u9593\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u65e5\u671f\u548c\u6642\u9593\u7684\u6578\u64da\u985e\u578b\uff1a<\/p>\n<ul>\n<li><code>DATE<\/code>\uff1a\u53ea\u5b58\u5132\u65e5\u671f\uff0c\u7bc4\u570d\u5f9e 0001-01-01 \u5230 9999-12-31\u3002<\/li>\n<li><code>TIME<\/code>\uff1a\u53ea\u5b58\u5132\u6642\u9593\uff0c\u7bc4\u570d\u5f9e 00:00:00.0000000 \u5230 23:59:59.9999999\u3002<\/li>\n<li><code>DATETIME<\/code>\uff1a\u540c\u6642\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\uff0c\u7bc4\u570d\u5f9e 1753-01-01 \u5230 9999-12-31\u3002<\/li>\n<li><code>DATETIME2<\/code>\uff1a\u6bd4<code>DATETIME<\/code>\u6709\u66f4\u5927\u7684\u7bc4\u570d\u548c\u7cbe\u5ea6\u3002<\/li>\n<li><code>SMALLDATETIME<\/code>\uff1a\u5b58\u5132\u7684\u7bc4\u570d\u8f03\u5c0f\uff0c\u7cbe\u5ea6\u8f03\u4f4e\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e6%97%a5%e6%9c%9f%e7%9a%84%e6%a0%bc%e5%bc%8f%e5%8c%96-TYNvALBTcT\">2. \u65e5\u671f\u7684\u683c\u5f0f\u5316<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>FORMAT<\/code>\u51fd\u6578\u4f86\u683c\u5f0f\u5316\u65e5\u671f\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528<code>FORMAT<\/code>\u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT FORMAT(GETDATE(), 'yyyy-MM-dd') AS FormattedDate;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u7576\u524d\u65e5\u671f\u683c\u5f0f\u5316\u70ba\u201c\u5e74-\u6708-\u65e5\u201d\u7684\u5f62\u5f0f\u3002<\/p>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e7%9a%84%e8%a8%88%e7%ae%97-TYNvALBTcT\">3. \u65e5\u671f\u7684\u8a08\u7b97<\/h2>\n<p>SQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u9032\u884c\u65e5\u671f\u8a08\u7b97\uff0c\u4f8b\u5982<code>DATEADD<\/code>\u3001<code>DATEDIFF<\/code>\u548c<code>GETDATE<\/code>\u7b49\u3002<\/p>\n<h3 id=\"3-1-%e4%bd%bf%e7%94%a8dateadd%e9%80%b2%e8%a1%8c%e6%97%a5%e6%9c%9f%e5%8a%a0%e6%b8%9b-TYNvALBTcT\">3.1 \u4f7f\u7528DATEADD\u9032\u884c\u65e5\u671f\u52a0\u6e1b<\/h3>\n<p><code>DATEADD<\/code>\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u5728\u6307\u5b9a\u7684\u65e5\u671f\u4e0a\u52a0\u4e0a\u6216\u6e1b\u53bb\u4e00\u5b9a\u7684\u6642\u9593\u9593\u9694\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT DATEADD(DAY, 10, GETDATE()) AS NewDate;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u7576\u524d\u65e5\u671f\u52a0\u4e0a10\u5929\u3002<\/p>\n<h3 id=\"3-2-%e4%bd%bf%e7%94%a8datediff%e8%a8%88%e7%ae%97%e6%97%a5%e6%9c%9f%e5%b7%ae-TYNvALBTcT\">3.2 \u4f7f\u7528DATEDIFF\u8a08\u7b97\u65e5\u671f\u5dee<\/h3>\n<p><code>DATEDIFF<\/code>\u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT DATEDIFF(DAY, '2023-01-01', GETDATE()) AS DaysDifference;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8a08\u7b97\u5f9e2023\u5e741\u67081\u65e5\u5230\u7576\u524d\u65e5\u671f\u7684\u5929\u6578\u5dee\u3002<\/p>\n<h2 id=\"4-%e6%97%a5%e6%9c%9f%e7%9a%84%e6%af%94%e8%bc%83-TYNvALBTcT\">4. \u65e5\u671f\u7684\u6bd4\u8f03<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6bd4\u8f03\u904b\u7b97\u7b26\uff08\u5982<code>=<\/code>\u3001<code>&gt;<\/code>\u3001<code>&lt;<\/code>\u7b49\uff09\u4f86\u6bd4\u8f03\u65e5\u671f\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM Orders WHERE OrderDate &gt; '2023-01-01';<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u67e5\u8a62\u6240\u6709\u57282023\u5e741\u67081\u65e5\u4e4b\u5f8c\u7684\u8a02\u55ae\u3002<\/p>\n<h2 id=\"5-%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%a1%88%e4%be%8b-TYNvALBTcT\">5. \u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>Employees<\/code>\u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u5165\u8077\u65e5\u671f\uff0c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6240\u6709\u5728\u904e\u53bb\u4e00\u5e74\u5167\u5165\u8077\u7684\u54e1\u5de5\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT * FROM Employees WHERE HireDate &gt; DATEADD(YEAR, -1, GETDATE());<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u6240\u6709\u5728\u904e\u53bb\u4e00\u5e74\u5167\u5165\u8077\u7684\u54e1\u5de5\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-TYNvALBTcT\">\u7e3d\u7d50<\/h2>\n<p>SQL Server\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u65e5\u671f\u548c\u6642\u9593\u64cd\u4f5c\u529f\u80fd\uff0c\u901a\u904e\u4f7f\u7528\u5404\u7a2e\u5167\u5efa\u51fd\u6578\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u65e5\u671f\u7684\u683c\u5f0f\u5316\u3001\u8a08\u7b97\u548c\u6bd4\u8f03\u3002\u9019\u4e9b\u64cd\u4f5c\u5728\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u4e2d\u81f3\u95dc\u91cd\u8981\uff0c\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u66f4\u597d\u5730\u7ba1\u7406\u5176\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\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1SQL Server\u65e5\u671f\u64cd\u4f5c\u7684\u5be6\u969b\u6d41\u7a0b\uff0c\u5f9e\u57fa\u672c\u51fd\u6578\u5230\u9ad8\u7d1a\u6280\u5de7\uff0c\u5168\u9762\u63d0\u5347\u4f60\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\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-137885","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137885","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=137885"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137885\/revisions"}],"predecessor-version":[{"id":137886,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137885\/revisions\/137886"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=137885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=137885"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=137885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}