{"id":78200,"date":"2024-10-16T11:37:30","date_gmt":"2024-10-16T03:37:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78200\/"},"modified":"2024-10-16T11:37:31","modified_gmt":"2024-10-16T03:37:31","slug":"mysql%e6%8c%87%e4%bb%a4-datediff%ef%bc%88%e6%97%a5%e6%9c%9f%e5%b7%ae%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78200\/","title":{"rendered":"MySQL\u6307\u4ee4: DATEDIFF()\uff08\u65e5\u671f\u5dee\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-datediff%ef%bc%88%e6%97%a5%e6%9c%9f%e5%b7%ae%ef%bc%89-RyfxFtQIrS\">MySQL\u6307\u4ee4: DATEDIFF()\uff08\u65e5\u671f\u5dee\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>DATEDIFF()<\/code>\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002<\/p>\n<h2 id=\"datediff%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-RyfxFtQIrS\">DATEDIFF()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p><code>DATEDIFF()<\/code>\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8fd4\u56de\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\u5dee\u3002\u9019\u500b\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DATEDIFF(date1, date2)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>date1<\/code>\u548c<code>date2<\/code>\u53ef\u4ee5\u662f\u65e5\u671f\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u578b\u5225\u7684\u6b04\u4f4d\u6216\u662f\u5176\u4ed6\u53ef\u8f49\u63db\u70ba\u65e5\u671f\u7684\u8868\u9054\u5f0f\u3002\u51fd\u6578\u7684\u8fd4\u56de\u503c\u662f\u4e00\u500b\u6574\u6578\uff0c\u8868\u793a<code>date1<\/code>\u8207<code>date2<\/code>\u4e4b\u9593\u7684\u5929\u6578\u5dee\u3002\u5982\u679c<code>date1<\/code>\u65e9\u65bc<code>date2<\/code>\uff0c\u5247\u8fd4\u56de\u7684\u503c\u70ba\u8ca0\u6578\uff1b\u5982\u679c<code>date1<\/code>\u665a\u65bc<code>date2<\/code>\uff0c\u5247\u8fd4\u56de\u7684\u503c\u70ba\u6b63\u6578\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-RyfxFtQIrS\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528<code>DATEDIFF()<\/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-RyfxFtQIrS\">\u7bc4\u4f8b 1: \u57fa\u672c\u7528\u6cd5<\/h3>\n<pre><code>SELECT DATEDIFF('2023-10-01', '2023-09-25') AS DateDifference;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u8fd4\u56de<code>6<\/code>\uff0c\u56e0\u70ba2023\u5e7410\u67081\u65e5\u82072023\u5e749\u670825\u65e5\u4e4b\u9593\u76f8\u5dee6\u5929\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-2-%e4%bd%bf%e7%94%a8%e8%a1%a8%e6%a0%bc%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f-RyfxFtQIrS\">\u7bc4\u4f8b 2: \u4f7f\u7528\u8868\u683c\u4e2d\u7684\u65e5\u671f<\/h3>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba<code>orders<\/code>\u7684\u8868\u683c\uff0c\u5176\u4e2d\u6709\u4e00\u500b<code>order_date<\/code>\u6b04\u4f4d\uff0c\u8a18\u9304\u4e86\u6bcf\u500b\u8a02\u55ae\u7684\u65e5\u671f\u3002\u53ef\u4ee5\u4f7f\u7528<code>DATEDIFF()<\/code>\u4f86\u8a08\u7b97\u6bcf\u500b\u8a02\u55ae\u8207\u7576\u524d\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\u5dee\uff1a<\/p>\n<pre><code>SELECT order_id, DATEDIFF(CURDATE(), order_date) AS DaysSinceOrder\nFROM orders;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u8a02\u55ae\u7684ID\u4ee5\u53ca\u81ea\u8a02\u55ae\u65e5\u671f\u4ee5\u4f86\u7684\u5929\u6578\u5dee\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b-3-%e7%b5%90%e5%90%88%e5%85%b6%e4%bb%96%e5%87%bd%e6%95%b8%e4%bd%bf%e7%94%a8-RyfxFtQIrS\">\u7bc4\u4f8b 3: \u7d50\u5408\u5176\u4ed6\u51fd\u6578\u4f7f\u7528<\/h3>\n<p>\u53ef\u4ee5\u5c07<code>DATEDIFF()<\/code>\u8207\u5176\u4ed6MySQL\u51fd\u6578\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982<code>IF()<\/code>\u51fd\u6578\uff0c\u4ee5\u4fbf\u6839\u64da\u65e5\u671f\u5dee\u7570\u9032\u884c\u689d\u4ef6\u5224\u65b7\uff1a<\/p>\n<pre><code>SELECT order_id,\n       IF(DATEDIFF(CURDATE(), order_date) &gt; 30, '\u8d85\u904e30\u5929', '\u672a\u8d85\u904e30\u5929') AS OrderStatus\nFROM orders;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u8a02\u55ae\u7684ID\u4ee5\u53ca\u5176\u72c0\u614b\uff0c\u6307\u793a\u8a72\u8a02\u55ae\u662f\u5426\u8d85\u904e30\u5929\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-RyfxFtQIrS\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528<code>DATEDIFF()<\/code>\u51fd\u6578\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u65e5\u671f\u683c\u5f0f\u5fc5\u9808\u6b63\u78ba\uff0c\u5426\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\u6216\u4e0d\u6b63\u78ba\u7684\u7d50\u679c\u3002<\/li>\n<li>\u5982\u679c\u4efb\u4e00\u65e5\u671f\u70ba<code>NULL<\/code>\uff0c\u5247\u8fd4\u56de\u503c\u4e5f\u5c07\u662f<code>NULL<\/code>\u3002<\/li>\n<li>\u8a72\u51fd\u6578\u50c5\u8a08\u7b97\u5929\u6578\u5dee\uff0c\u4e0d\u8003\u616e\u6642\u9593\u90e8\u5206\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-RyfxFtQIrS\">\u7e3d\u7d50<\/h2>\n<p><code>DATEDIFF()<\/code>\u51fd\u6578\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u8f15\u9b06\u8a08\u7b97\u65e5\u671f\u4e4b\u9593\u7684\u5dee\u7570\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u65e5\u5e38\u7684\u6578\u64da\u7ba1\u7406\u4e2d\uff0c\u9019\u500b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u65e5\u671f\u6578\u64da\u7684\u61c9\u7528\u4f86\u8aaa\uff0c\u638c\u63e1<code>DATEDIFF()<\/code>\u7684\u4f7f\u7528\u65b9\u6cd5\u5c07\u5927\u5927\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/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\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u5353\u8d8a\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4DATEDIFF()\uff0c\u8ba1\u7b97\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u8f7b\u677e\u5904\u7406\u65e5\u671f\u6570\u636e\uff0c\u63d0\u5347\u6570\u636e\u5e93\u7ba1\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-78200","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78200","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=78200"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78200\/revisions"}],"predecessor-version":[{"id":78201,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78200\/revisions\/78201"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}