{"id":144093,"date":"2024-11-01T05:37:30","date_gmt":"2024-10-31T21:37:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144093\/"},"modified":"2024-11-01T05:37:31","modified_gmt":"2024-10-31T21:37:31","slug":"sql-%e4%b8%ad%e4%b8%80%e5%80%8b%e5%be%88%e5%a5%bd%e7%94%a8%e7%9a%84%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f%e5%8c%96%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144093\/","title":{"rendered":"SQL \u4e2d\u4e00\u500b\u5f88\u597d\u7528\u7684\u65e5\u671f\u683c\u5f0f\u5316\u51fd\u6578"},"content":{"rendered":"<h1 id=\"sql-%e4%b8%ad%e4%b8%80%e5%80%8b%e5%be%88%e5%a5%bd%e7%94%a8%e7%9a%84%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f%e5%8c%96%e5%87%bd%e6%95%b8-CEtXRQnXMg\">SQL \u4e2d\u4e00\u500b\u5f88\u597d\u7528\u7684\u65e5\u671f\u683c\u5f0f\u5316\u51fd\u6578<\/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\u3002\u7121\u8ad6\u662f\u8a18\u9304\u4e8b\u4ef6\u7684\u6642\u9593\u6233\uff0c\u9084\u662f\u751f\u6210\u5831\u544a\u6642\u9700\u8981\u7684\u65e5\u671f\u683c\u5f0f\uff0c\u6b63\u78ba\u7684\u65e5\u671f\u683c\u5f0f\u5316\u51fd\u6578\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u5c55\u793a\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39 SQL \u4e2d\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u65e5\u671f\u683c\u5f0f\u5316\u51fd\u6578\u2014\u2014<code>DATE_FORMAT()<\/code>\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-date_format-%e5%87%bd%e6%95%b8%ef%bc%9f-CEtXRQnXMg\">\u4ec0\u9ebc\u662f DATE_FORMAT() \u51fd\u6578\uff1f<\/h2>\n<p><code>DATE_FORMAT()<\/code> \u662f MySQL \u4e2d\u7528\u4f86\u683c\u5f0f\u5316\u65e5\u671f\u7684\u51fd\u6578\u3002\u5b83\u5141\u8a31\u7528\u6236\u6839\u64da\u6307\u5b9a\u7684\u683c\u5f0f\u5c07\u65e5\u671f\u6216\u6642\u9593\u8f49\u63db\u70ba\u5b57\u7b26\u4e32\u3002\u9019\u5c0d\u65bc\u9700\u8981\u4ee5\u7279\u5b9a\u683c\u5f0f\u986f\u793a\u65e5\u671f\u7684\u61c9\u7528\u5834\u666f\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\u5728\u5831\u544a\u4e2d\u986f\u793a\u65e5\u671f\uff0c\u6216\u5728\u7528\u6236\u754c\u9762\u4e2d\u4ee5\u53cb\u597d\u7684\u65b9\u5f0f\u5c55\u793a\u6642\u9593\u3002<\/p>\n<h2 id=\"date_format-%e5%87%bd%e6%95%b8%e7%9a%84%e8%aa%9e%e6%b3%95-CEtXRQnXMg\">DATE_FORMAT() \u51fd\u6578\u7684\u8a9e\u6cd5<\/h2>\n<pre><code>DATE_FORMAT(date, format)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>date<\/code> \u662f\u8981\u683c\u5f0f\u5316\u7684\u65e5\u671f\u503c\uff0c\u800c <code>format<\/code> \u5247\u662f\u6307\u5b9a\u7684\u683c\u5f0f\u5b57\u7b26\u4e32\u3002\u683c\u5f0f\u5b57\u7b26\u4e32\u53ef\u4ee5\u5305\u542b\u591a\u7a2e\u683c\u5f0f\u5316\u7b26\u865f\uff0c\u9019\u4e9b\u7b26\u865f\u5c07\u88ab\u66ff\u63db\u70ba\u76f8\u61c9\u7684\u65e5\u671f\u6216\u6642\u9593\u90e8\u5206\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84%e6%a0%bc%e5%bc%8f%e5%8c%96%e7%ac%a6%e8%99%9f-CEtXRQnXMg\">\u5e38\u7528\u7684\u683c\u5f0f\u5316\u7b26\u865f<\/h2>\n<ul>\n<li><code>%Y<\/code> &#8211; \u56db\u4f4d\u6578\u7684\u5e74\u4efd\uff08\u4f8b\u5982\uff1a2023\uff09<\/li>\n<li><code>%y<\/code> &#8211; \u5169\u4f4d\u6578\u7684\u5e74\u4efd\uff08\u4f8b\u5982\uff1a23\uff09<\/li>\n<li><code>%m<\/code> &#8211; \u6708\u4efd\uff0801 \u5230 12\uff09<\/li>\n<li><code>%d<\/code> &#8211; \u4e00\u500b\u6708\u4e2d\u7684\u5929\u6578\uff0801 \u5230 31\uff09<\/li>\n<li><code>%H<\/code> &#8211; \u5c0f\u6642\uff0800 \u5230 23\uff09<\/li>\n<li><code>%i<\/code> &#8211; \u5206\u9418\uff0800 \u5230 59\uff09<\/li>\n<li><code>%s<\/code> &#8211; \u79d2\uff0800 \u5230 59\uff09<\/li>\n<li><code>%W<\/code> &#8211; \u661f\u671f\u5e7e\u7684\u540d\u7a31\uff08\u4f8b\u5982\uff1aMonday\uff09<\/li>\n<li><code>%M<\/code> &#8211; \u6708\u4efd\u7684\u540d\u7a31\uff08\u4f8b\u5982\uff1aJanuary\uff09<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-CEtXRQnXMg\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 <code>DATE_FORMAT()<\/code> \u51fd\u6578\u7684\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>orders<\/code> \u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b <code>order_date<\/code> \u6b04\u4f4d\uff0c\u8a18\u9304\u4e86\u8a02\u55ae\u7684\u65e5\u671f\uff1a<\/p>\n<pre><code>SELECT \n    order_id, \n    DATE_FORMAT(order_date, '%Y-%m-%d') AS formatted_date \nFROM \n    orders;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5c07 <code>order_date<\/code> \u683c\u5f0f\u5316\u70ba\u300cYYYY-MM-DD\u300d\u7684\u5f62\u5f0f\uff0c\u4e26\u5c07\u5176\u547d\u540d\u70ba <code>formatted_date<\/code>\u3002\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u4ee5\u66f4\u6613\u8b80\u7684\u683c\u5f0f\u67e5\u770b\u8a02\u55ae\u65e5\u671f\u3002<\/p>\n<h2 id=\"%e9%80%b2%e9%9a%8e%e7%94%a8%e6%b3%95-CEtXRQnXMg\">\u9032\u968e\u7528\u6cd5<\/h2>\n<p>\u9664\u4e86\u57fa\u672c\u7684\u65e5\u671f\u683c\u5f0f\u5316\uff0c<code>DATE_FORMAT()<\/code> \u9084\u53ef\u4ee5\u8207\u5176\u4ed6 SQL \u51fd\u6578\u7d50\u5408\u4f7f\u7528\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>NOW()<\/code> \u51fd\u6578\u7372\u53d6\u7576\u524d\u65e5\u671f\u548c\u6642\u9593\uff0c\u7136\u5f8c\u9032\u884c\u683c\u5f0f\u5316\uff1a<\/p>\n<pre><code>SELECT \n    DATE_FORMAT(NOW(), '%Y-%m-%d %H:%i:%s') AS current_datetime;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\uff0c\u683c\u5f0f\u70ba\u300cYYYY-MM-DD HH:MM:SS\u300d\u3002\u9019\u5728\u9700\u8981\u8a18\u9304\u7576\u524d\u6642\u9593\u6233\u7684\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CEtXRQnXMg\">\u7e3d\u7d50<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c<code>DATE_FORMAT()<\/code> \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u4ee5\u9748\u6d3b\u7684\u65b9\u5f0f\u683c\u5f0f\u5316\u65e5\u671f\u548c\u6642\u9593\u3002\u7121\u8ad6\u662f\u5728\u5831\u544a\u751f\u6210\u3001\u6578\u64da\u5c55\u793a\u9084\u662f\u7528\u6236\u754c\u9762\u8a2d\u8a08\u4e2d\uff0c\u6b63\u78ba\u7684\u65e5\u671f\u683c\u5f0f\u5316\u90fd\u80fd\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u548c\u6578\u64da\u7684\u53ef\u8b80\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e9b SQL \u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/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\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u4e2d\u5f37\u5927\u7684\u65e5\u671f\u683c\u5f0f\u5316\u51fd\u6578\uff0c\u8f15\u9b06\u8f49\u63db\u548c\u986f\u793a\u65e5\u671f\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u548c\u5831\u544a\u7684\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-144093","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144093","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=144093"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144093\/revisions"}],"predecessor-version":[{"id":144094,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144093\/revisions\/144094"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144093"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144093"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144093"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}