{"id":78266,"date":"2024-10-16T11:40:17","date_gmt":"2024-10-16T03:40:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78266\/"},"modified":"2024-10-16T11:40:17","modified_gmt":"2024-10-16T03:40:17","slug":"mysql%e6%8c%87%e4%bb%a4-dayofweek%ef%bc%88%e6%98%9f%e6%9c%9f%e5%b9%be%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78266\/","title":{"rendered":"MySQL\u6307\u4ee4: DAYOFWEEK()\uff08\u661f\u671f\u5e7e\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-dayofweek%ef%bc%88%e6%98%9f%e6%9c%9f%e5%b9%be%ef%bc%89-PxfHnlBlmm\">MySQL\u6307\u4ee4: DAYOFWEEK()\uff08\u661f\u671f\u5e7e\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u65e5\u671f\u548c\u6642\u9593\u7684\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u74b0\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f <code>DAYOFWEEK()<\/code> \u51fd\u6578\u3002\u9019\u500b\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u7372\u53d6\u7279\u5b9a\u65e5\u671f\u662f\u661f\u671f\u5e7e\uff0c\u5c0d\u65bc\u9700\u8981\u9032\u884c\u65e5\u671f\u8a08\u7b97\u6216\u5831\u544a\u751f\u6210\u7684\u61c9\u7528\u5834\u666f\u4f86\u8aaa\uff0c\u9019\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\u3002<\/p>\n<h2 id=\"dayofweek-%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-PxfHnlBlmm\">DAYOFWEEK() \u51fd\u6578\u6982\u8ff0<\/h2>\n<p><code>DAYOFWEEK()<\/code> \u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DAYOFWEEK(date)<\/code><\/pre>\n<p>\u9019\u88e1\u7684 <code>date<\/code> \u53c3\u6578\u53ef\u4ee5\u662f\u65e5\u671f\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u6642\u9593\u985e\u578b\u7684\u5b57\u6bb5\uff0c\u6216\u8005\u662f\u4efb\u4f55\u53ef\u4ee5\u88ab MySQL \u89e3\u6790\u70ba\u65e5\u671f\u7684\u8868\u9054\u5f0f\u3002\u8a72\u51fd\u6578\u8fd4\u56de\u4e00\u500b\u6574\u6578\uff0c\u8868\u793a\u8a72\u65e5\u671f\u662f\u661f\u671f\u5e7e\uff0c\u5177\u9ad4\u5c0d\u61c9\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>1 &#8211; \u661f\u671f\u65e5<\/li>\n<li>2 &#8211; \u661f\u671f\u4e00<\/li>\n<li>3 &#8211; \u661f\u671f\u4e8c<\/li>\n<li>4 &#8211; \u661f\u671f\u4e09<\/li>\n<li>5 &#8211; \u661f\u671f\u56db<\/li>\n<li>6 &#8211; \u661f\u671f\u4e94<\/li>\n<li>7 &#8211; \u661f\u671f\u516d<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-PxfHnlBlmm\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 <code>DAYOFWEEK()<\/code> \u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT DAYOFWEEK('2023-10-01') AS weekday;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>1<\/code>\uff0c\u56e0\u70ba2023\u5e7410\u67081\u65e5\u662f\u661f\u671f\u65e5\u3002<\/p>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u67d0\u500b\u8868\u683c\u4e2d\u6240\u6709\u65e5\u671f\u7684\u661f\u671f\u5e7e\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>SELECT event_date, DAYOFWEEK(event_date) AS weekday FROM events;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de <code>events<\/code> \u8868\u4e2d\u6bcf\u500b\u4e8b\u4ef6\u7684\u65e5\u671f\u53ca\u5176\u5c0d\u61c9\u7684\u661f\u671f\u5e7e\u3002<\/p>\n<h2 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-PxfHnlBlmm\">\u61c9\u7528\u5834\u666f<\/h2>\n<p><code>DAYOFWEEK()<\/code> \u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u5831\u544a\u751f\u6210\uff1a<\/strong>\u5728\u751f\u6210\u6bcf\u5468\u5831\u544a\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b64\u51fd\u6578\u4f86\u78ba\u5b9a\u6578\u64da\u7684\u5206\u4f48\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u6790\uff1a<\/strong>\u5728\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u4e86\u89e3\u67d0\u4e9b\u4e8b\u4ef6\u767c\u751f\u7684\u661f\u671f\u5e7e\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u8da8\u52e2\u3002<\/li>\n<li><strong>\u65e5\u66c6\u61c9\u7528\uff1a<\/strong>\u5728\u65e5\u66c6\u61c9\u7528\u4e2d\uff0c\u78ba\u5b9a\u67d0\u500b\u65e5\u671f\u662f\u661f\u671f\u5e7e\u662f\u57fa\u672c\u529f\u80fd\u4e4b\u4e00\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-PxfHnlBlmm\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 <code>DAYOFWEEK()<\/code> \u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u50b3\u5165\u7684\u65e5\u671f\u683c\u5f0f\u6b63\u78ba\uff0c\u5426\u5247\u53ef\u80fd\u6703\u8fd4\u56de NULL\u3002<\/li>\n<li>\u8a72\u51fd\u6578\u7684\u8fd4\u56de\u503c\u662f\u6574\u6578\uff0c\u82e5\u9700\u8981\u4ee5\u6587\u5b57\u5f62\u5f0f\u986f\u793a\u661f\u671f\u5e7e\uff0c\u5247\u9700\u8981\u9032\u4e00\u6b65\u8655\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-PxfHnlBlmm\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684 <code>DAYOFWEEK()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u7372\u53d6\u7279\u5b9a\u65e5\u671f\u662f\u661f\u671f\u5e7e\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u65e5\u66c6\u61c9\u7528\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u5c0d\u65bc\u9700\u8981\u9032\u884c\u65e5\u671f\u8a08\u7b97\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u500b\u51fd\u6578\u5c07\u5927\u5927\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\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\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4DAYOFWEEK()\uff0c\u8f15\u9b06\u7372\u53d6\u65e5\u671f\u5c0d\u61c9\u7684\u661f\u671f\u5e7e\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\u8207\u6e96\u78ba\u6027\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-78266","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78266","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=78266"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78266\/revisions"}],"predecessor-version":[{"id":78267,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78266\/revisions\/78267"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}