{"id":143819,"date":"2024-11-01T01:31:17","date_gmt":"2024-10-31T17:31:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143819\/"},"modified":"2024-11-01T01:31:18","modified_gmt":"2024-10-31T17:31:18","slug":"sql-%e5%87%bd%e6%95%b8%e4%b9%8b-datepart-%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143819\/","title":{"rendered":"SQL \u51fd\u6578\u4e4b DATEPART \u51fd\u6578"},"content":{"rendered":"<h1 id=\"sql-%e5%87%bd%e6%95%b8%e4%b9%8b-datepart-%e5%87%bd%e6%95%b8-IWQyJoLAsa\">SQL \u51fd\u6578\u4e4b DATEPART \u51fd\u6578<\/h1>\n<p>\u5728 SQL \u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u529f\u80fd\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\uff0c\u9084\u662f\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\uff0c\u5c0d\u65bc\u65e5\u671f\u548c\u6642\u9593\u7684\u64cd\u4f5c\u90fd\u4e0d\u53ef\u6216\u7f3a\u3002SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\uff0c\u5176\u4e2d <code>DATEPART<\/code> \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u65e5\u671f\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-datepart-%e5%87%bd%e6%95%b8%ef%bc%9f-IWQyJoLAsa\">\u4ec0\u9ebc\u662f DATEPART \u51fd\u6578\uff1f<\/h2>\n<p><code>DATEPART<\/code> \u51fd\u6578\u7528\u65bc\u5f9e\u65e5\u671f\u6216\u6642\u9593\u503c\u4e2d\u63d0\u53d6\u6307\u5b9a\u7684\u90e8\u5206\u3002\u9019\u4e9b\u90e8\u5206\u53ef\u4ee5\u662f\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\u7b49\u3002\u9019\u500b\u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DATEPART(datepart, date)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>datepart<\/code> \u662f\u8981\u63d0\u53d6\u7684\u65e5\u671f\u90e8\u5206\uff0c<code>date<\/code> \u662f\u8981\u8655\u7406\u7684\u65e5\u671f\u6216\u6642\u9593\u503c\u3002<\/p>\n<h2 id=\"datepart-%e5%87%bd%e6%95%b8%e7%9a%84%e5%8f%83%e6%95%b8-IWQyJoLAsa\">DATEPART \u51fd\u6578\u7684\u53c3\u6578<\/h2>\n<p>\u5728\u4f7f\u7528 <code>DATEPART<\/code> \u51fd\u6578\u6642\uff0c<code>datepart<\/code> \u53c3\u6578\u53ef\u4ee5\u662f\u4ee5\u4e0b\u5e7e\u7a2e\u5e38\u898b\u7684\u9078\u9805\uff1a<\/p>\n<ul>\n<li><code>year<\/code> \u6216 <code>yy<\/code>\uff1a\u63d0\u53d6\u5e74\u4efd<\/li>\n<li><code>month<\/code> \u6216 <code>mm<\/code>\uff1a\u63d0\u53d6\u6708\u4efd<\/li>\n<li><code>day<\/code> \u6216 <code>dd<\/code>\uff1a\u63d0\u53d6\u65e5\u671f<\/li>\n<li><code>hour<\/code> \u6216 <code>hh<\/code>\uff1a\u63d0\u53d6\u5c0f\u6642<\/li>\n<li><code>minute<\/code> \u6216 <code>mi<\/code>\uff1a\u63d0\u53d6\u5206\u9418<\/li>\n<li><code>second<\/code> \u6216 <code>ss<\/code>\uff1a\u63d0\u53d6\u79d2\u6578<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-IWQyJoLAsa\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 <code>DATEPART<\/code> \u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-1%ef%bc%9a%e6%8f%90%e5%8f%96%e5%b9%b4%e4%bb%bd-IWQyJoLAsa\">\u7bc4\u4f8b 1\uff1a\u63d0\u53d6\u5e74\u4efd<\/h3>\n<pre><code>SELECT DATEPART(year, '2023-10-01') AS YearPart;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de <code>2023<\/code>\uff0c\u56e0\u70ba\u5b83\u63d0\u53d6\u4e86\u6307\u5b9a\u65e5\u671f\u7684\u5e74\u4efd\u90e8\u5206\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2%ef%bc%9a%e6%8f%90%e5%8f%96%e6%9c%88%e4%bb%bd-IWQyJoLAsa\">\u7bc4\u4f8b 2\uff1a\u63d0\u53d6\u6708\u4efd<\/h3>\n<pre><code>SELECT DATEPART(month, '2023-10-01') AS MonthPart;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de <code>10<\/code>\uff0c\u56e0\u70ba\u5b83\u63d0\u53d6\u4e86\u6307\u5b9a\u65e5\u671f\u7684\u6708\u4efd\u90e8\u5206\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-3%ef%bc%9a%e6%8f%90%e5%8f%96%e6%97%a5%e6%9c%9f-IWQyJoLAsa\">\u7bc4\u4f8b 3\uff1a\u63d0\u53d6\u65e5\u671f<\/h3>\n<pre><code>SELECT DATEPART(day, '2023-10-01') AS DayPart;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de <code>1<\/code>\uff0c\u56e0\u70ba\u5b83\u63d0\u53d6\u4e86\u6307\u5b9a\u65e5\u671f\u7684\u65e5\u671f\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-IWQyJoLAsa\">\u61c9\u7528\u5834\u666f<\/h2>\n<p><code>DATEPART<\/code> \u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u5831\u544a\u4e2d\u9700\u8981\u6309\u5e74\u4efd\u6216\u6708\u4efd\u5206\u7d44\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b64\u51fd\u6578\u4f86\u63d0\u53d6\u6240\u9700\u7684\u65e5\u671f\u90e8\u5206\u3002\u9019\u6a23\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u53ef\u8996\u5316\u3002<\/p>\n<p>\u6b64\u5916\uff0c<code>DATEPART<\/code> \u51fd\u6578\u4e5f\u53ef\u4ee5\u8207\u5176\u4ed6 SQL \u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982 <code>GROUP BY<\/code> \u548c <code>ORDER BY<\/code>\uff0c\u4ee5\u4fbf\u66f4\u9748\u6d3b\u5730\u8655\u7406\u548c\u986f\u793a\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IWQyJoLAsa\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0c<code>DATEPART<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u65e5\u671f\u548c\u6642\u9593\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\uff0c\u5f9e\u800c\u9032\u884c\u66f4\u6df1\u5165\u7684\u6578\u64da\u5206\u6790\u3002\u7121\u8ad6\u662f\u5728\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u5831\u544a\u751f\u6210\u4e2d\uff0c\u638c\u63e1\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u4e26\u5e0c\u671b\u7372\u5f97\u66f4\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL \u4e2d\u7684 DATEPART \u51fd\u6578\uff0c\u5b78\u7fd2\u5982\u4f55\u63d0\u53d6\u65e5\u671f\u7684\u7279\u5b9a\u90e8\u5206\uff0c\u5982\u5e74\u3001\u6708\u3001\u65e5\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\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-143819","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143819","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=143819"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143819\/revisions"}],"predecessor-version":[{"id":143820,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143819\/revisions\/143820"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143819"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}