{"id":78556,"date":"2024-10-16T12:01:17","date_gmt":"2024-10-16T04:01:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78556\/"},"modified":"2024-10-16T12:01:17","modified_gmt":"2024-10-16T04:01:17","slug":"mysql%e6%8c%87%e4%bb%a4-from_days%ef%bc%88%e5%be%9e%e5%a4%a9%e6%95%b8%e8%a8%88%e7%ae%97%e6%97%a5%e6%9c%9f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78556\/","title":{"rendered":"MySQL\u6307\u4ee4: FROM_DAYS()\uff08\u5f9e\u5929\u6578\u8a08\u7b97\u65e5\u671f\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-from_days%ef%bc%88%e5%be%9e%e5%a4%a9%e6%95%b8%e8%a8%88%e7%ae%97%e6%97%a5%e6%9c%9f%ef%bc%89-NTjBxZMAUh\">MySQL\u6307\u4ee4: FROM_DAYS()\uff08\u5f9e\u5929\u6578\u8a08\u7b97\u65e5\u671f\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\u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u3002\u5176\u4e2d\uff0c<code>FROM_DAYS()<\/code>\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6839\u64da\u7d66\u5b9a\u7684\u5929\u6578\u8a08\u7b97\u51fa\u76f8\u61c9\u7684\u65e5\u671f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>FROM_DAYS()<\/code>\u7684\u7528\u6cd5\u53ca\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-from_days-%e5%87%bd%e6%95%b8%ef%bc%9f-NTjBxZMAUh\">\u4ec0\u9ebc\u662f FROM_DAYS() \u51fd\u6578\uff1f<\/h2>\n<p><code>FROM_DAYS()<\/code>\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c07\u4e00\u500b\u6574\u6578\uff08\u8868\u793a\u5f9e&#8217;0000-01-01&#8217;\u958b\u59cb\u7684\u5929\u6578\uff09\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\u3002\u9019\u500b\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>FROM_DAYS(N)<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>N<\/code>\u662f\u4e00\u500b\u6574\u6578\uff0c\u8868\u793a\u5f9e&#8217;0000-01-01&#8217;\u958b\u59cb\u7684\u5929\u6578\u3002\u9019\u500b\u51fd\u6578\u8fd4\u56de\u7684\u7d50\u679c\u662f\u4e00\u500b\u65e5\u671f\uff0c\u683c\u5f0f\u70ba&#8217;YYYY-MM-DD&#8217;\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-NTjBxZMAUh\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528<code>FROM_DAYS()<\/code>\u51fd\u6578\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-1-%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-NTjBxZMAUh\">\u7bc4\u4f8b 1: \u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code>SELECT FROM_DAYS(738000);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c738000\u8868\u793a\u5f9e&#8217;0000-01-01&#8217;\u958b\u59cb\u7684\u7b2c738000\u5929\u3002\u57f7\u884c\u9019\u689d\u67e5\u8a62\u5f8c\uff0c\u5c07\u8fd4\u56de\u76f8\u61c9\u7684\u65e5\u671f\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2-%e7%b5%90%e5%90%88%e5%85%b6%e4%bb%96%e5%87%bd%e6%95%b8%e4%bd%bf%e7%94%a8-NTjBxZMAUh\">\u7bc4\u4f8b 2: \u7d50\u5408\u5176\u4ed6\u51fd\u6578\u4f7f\u7528<\/h3>\n<p>\u6211\u5011\u53ef\u4ee5\u5c07<code>FROM_DAYS()<\/code>\u8207\u5176\u4ed6\u65e5\u671f\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4ee5\u7372\u5f97\u66f4\u8907\u96dc\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u60f3\u8981\u8a08\u7b97\u67d0\u500b\u65e5\u671f\u7684\u524d\u5f8c\u5e7e\u5929\uff1a<\/p>\n<pre><code>SELECT FROM_DAYS(738000) AS calculated_date, \n       DATE_ADD(FROM_DAYS(738000), INTERVAL 10 DAY) AS date_plus_10_days,\n       DATE_SUB(FROM_DAYS(738000), INTERVAL 5 DAY) AS date_minus_5_days;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de738000\u5929\u5c0d\u61c9\u7684\u65e5\u671f\uff0c\u4ee5\u53ca\u8a72\u65e5\u671f\u52a0\u4e0a10\u5929\u548c\u6e1b\u53bb5\u5929\u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-NTjBxZMAUh\">\u61c9\u7528\u5834\u666f<\/h2>\n<p><code>FROM_DAYS()<\/code>\u51fd\u6578\u5728\u8a31\u591a\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9032\u884c\u65e5\u671f\u8a08\u7b97\u7684\u60c5\u6cc1\u4e0b\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5206\u6790\uff1a<\/strong>\u5728\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u7d93\u5e38\u9700\u8981\u6839\u64da\u5929\u6578\u8a08\u7b97\u51fa\u7279\u5b9a\u7684\u65e5\u671f\uff0c\u4ee5\u4fbf\u9032\u884c\u8da8\u52e2\u5206\u6790\u6216\u5831\u544a\u751f\u6210\u3002<\/li>\n<li><strong>\u5831\u8868\u751f\u6210\uff1a<\/strong>\u5728\u751f\u6210\u5831\u8868\u6642\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u5929\u6578\u8f49\u63db\u70ba\u65e5\u671f\uff0c\u4ee5\u4fbf\u66f4\u6e05\u6670\u5730\u5c55\u793a\u6578\u64da\u3002<\/li>\n<li><strong>\u6578\u64da\u9077\u79fb\uff1a<\/strong>\u5728\u6578\u64da\u9077\u79fb\u904e\u7a0b\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u67d0\u4e9b\u6578\u64da\u7684\u5929\u6578\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\uff0c\u4ee5\u4fbf\u65bc\u5728\u65b0\u7cfb\u7d71\u4e2d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-NTjBxZMAUh\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u4f7f\u7528<code>FROM_DAYS()<\/code>\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u50b3\u5165\u7684\u5929\u6578\u5c0f\u65bc1\uff0c\u5247\u51fd\u6578\u5c07\u8fd4\u56deNULL\u3002<\/li>\n<li>\u8a72\u51fd\u6578\u7684\u8fd4\u56de\u503c\u662f\u57fa\u65bc&#8217;0000-01-01&#8217;\u7684\u65e5\u671f\u8a08\u7b97\uff0c\u56e0\u6b64\u5728\u8655\u7406\u65e5\u671f\u6642\u9700\u8003\u616e\u5230\u9019\u4e00\u9ede\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5c07\u7d50\u679c\u8f49\u63db\u70ba\u5176\u4ed6\u65e5\u671f\u683c\u5f0f\uff0c\u4ee5\u7b26\u5408\u7279\u5b9a\u7684\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NTjBxZMAUh\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684<code>FROM_DAYS()<\/code>\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6839\u64da\u5929\u6578\u8a08\u7b97\u51fa\u76f8\u61c9\u7684\u65e5\u671f\uff0c\u4e26\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u8868\u751f\u6210\u548c\u6578\u64da\u9077\u79fb\u7b49\u591a\u500b\u5834\u666f\u4e2d\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u4e86\u89e3\u4e26\u638c\u63e1\u9019\u500b\u51fd\u6578\u7684\u4f7f\u7528\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc<code>FROM_DAYS()<\/code>\u51fd\u6578\u6216\u5176\u4ed6MySQL\u529f\u80fd\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u5efa\u8b70\u60a8\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u9032\u884c\u66f4\u6df1\u5165\u7684\u5b78\u7fd2\u548c\u5be6\u8e10\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4FROM_DAYS()\uff0c\u900f\u904e\u5929\u6578\u8a08\u7b97\u65e5\u671f\uff0c\u8f15\u9b06\u8f49\u63db\u6578\u5b57\u70ba\u65e5\u671f\u683c\u5f0f\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\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-78556","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78556","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=78556"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78556\/revisions"}],"predecessor-version":[{"id":78557,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78556\/revisions\/78557"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}