{"id":78632,"date":"2024-10-16T12:09:03","date_gmt":"2024-10-16T04:09:03","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78632\/"},"modified":"2024-10-16T12:09:03","modified_gmt":"2024-10-16T04:09:03","slug":"mysql%e6%8c%87%e4%bb%a4-hour%ef%bc%88%e5%b0%8f%e6%99%82%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78632\/","title":{"rendered":"MySQL\u6307\u4ee4: HOUR()\uff08\u5c0f\u6642\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-hour%ef%bc%88%e5%b0%8f%e6%99%82%ef%bc%89-BykuMIJyOE\">MySQL\u6307\u4ee4: HOUR()\uff08\u5c0f\u6642\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u5f37\u5927\u7684\u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u6578\u64da\u3002\u5176\u4e2d\uff0cHOUR()\u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5f9e\u6642\u9593\u503c\u4e2d\u63d0\u53d6\u5c0f\u6642\u90e8\u5206\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eHOUR()\u51fd\u6578\u7684\u7528\u6cd5\u3001\u8a9e\u6cd5\u53ca\u5176\u61c9\u7528\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"hour%e5%87%bd%e6%95%b8%e6%a6%82%e8%bf%b0-BykuMIJyOE\">HOUR()\u51fd\u6578\u6982\u8ff0<\/h2>\n<p>HOUR()\u51fd\u6578\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5f9e\u7d66\u5b9a\u7684\u6642\u9593\u6216\u65e5\u671f\u6642\u9593\u503c\u4e2d\u63d0\u53d6\u5c0f\u6642\u90e8\u5206\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9032\u884c\u6642\u9593\u5206\u6790\u6216\u5831\u544a\u7684\u61c9\u7528\u5834\u666f\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h3 id=\"%e8%aa%9e%e6%b3%95-BykuMIJyOE\">\u8a9e\u6cd5<\/h3>\n<pre><code>HOUR(time)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>time<\/code>\u53ef\u4ee5\u662f\u6642\u9593\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u6642\u9593\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\uff0c\u6216\u662f\u6642\u9593\u985e\u578b\u7684\u5217\u3002HOUR()\u51fd\u6578\u5c07\u8fd4\u56de\u4e00\u500b\u6574\u6578\uff0c\u8868\u793a\u5c0f\u6642\u90e8\u5206\uff0c\u7bc4\u570d\u5f9e0\u523023\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-BykuMIJyOE\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528HOUR()\u51fd\u6578\u7684\u5be6\u969b\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b1-%e6%8f%90%e5%8f%96%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e7%9a%84%e5%b0%8f%e6%99%82-BykuMIJyOE\">\u7bc4\u4f8b1: \u63d0\u53d6\u7576\u524d\u6642\u9593\u7684\u5c0f\u6642<\/h3>\n<pre><code>SELECT HOUR(NOW()) AS CurrentHour;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u7576\u524d\u7cfb\u7d71\u6642\u9593\u7684\u5c0f\u6642\u90e8\u5206\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7576\u524d\u6642\u9593\u662f14:35:22\uff0c\u5247\u8fd4\u56de\u7684\u7d50\u679c\u5c07\u662f14\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b2-%e5%be%9e%e7%89%b9%e5%ae%9a%e6%97%a5%e6%9c%9f%e6%99%82%e9%96%93%e4%b8%ad%e6%8f%90%e5%8f%96%e5%b0%8f%e6%99%82-BykuMIJyOE\">\u7bc4\u4f8b2: \u5f9e\u7279\u5b9a\u65e5\u671f\u6642\u9593\u4e2d\u63d0\u53d6\u5c0f\u6642<\/h3>\n<pre><code>SELECT HOUR('2023-10-01 15:45:00') AS ExtractedHour;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u5f9e\u6307\u5b9a\u7684\u65e5\u671f\u6642\u9593\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5c0f\u6642\u90e8\u5206\uff0c\u7d50\u679c\u5c07\u662f15\u3002<\/p>\n<h3 id=\"%e7%af%84%e4%be%8b3-%e5%9c%a8%e6%9f%a5%e8%a9%a2%e4%b8%ad%e4%bd%bf%e7%94%a8hour%e5%87%bd%e6%95%b8-BykuMIJyOE\">\u7bc4\u4f8b3: \u5728\u67e5\u8a62\u4e2d\u4f7f\u7528HOUR()\u51fd\u6578<\/h3>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba<code>orders<\/code>\u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u500b<code>order_time<\/code>\u5217\uff0c\u8a18\u9304\u4e86\u6bcf\u500b\u8a02\u55ae\u7684\u6642\u9593\u3002\u53ef\u4ee5\u4f7f\u7528HOUR()\u51fd\u6578\u4f86\u67e5\u8a62\u6bcf\u500b\u8a02\u55ae\u7684\u8a02\u55ae\u5c0f\u6642\uff1a<\/p>\n<pre><code>SELECT order_id, HOUR(order_time) AS OrderHour FROM orders;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u8a02\u55ae\u7684ID\u53ca\u5176\u5c0d\u61c9\u7684\u5c0f\u6642\u90e8\u5206\uff0c\u65b9\u4fbf\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-BykuMIJyOE\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>HOUR()\u51fd\u6578\u50c5\u9069\u7528\u65bc\u6642\u9593\u6216\u65e5\u671f\u6642\u9593\u683c\u5f0f\u7684\u6578\u64da\u3002\u5982\u679c\u50b3\u5165\u7684\u6578\u64da\u683c\u5f0f\u4e0d\u6b63\u78ba\uff0c\u5c07\u8fd4\u56deNULL\u3002<\/li>\n<li>\u5728\u4f7f\u7528HOUR()\u51fd\u6578\u6642\uff0c\u8acb\u6ce8\u610f\u6642\u5340\u7684\u5f71\u97ff\u3002\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u6642\u5340\u8a2d\u7f6e\u8207\u61c9\u7528\u7a0b\u5e8f\u7684\u6642\u5340\u4e00\u81f4\uff0c\u4ee5\u907f\u514d\u6642\u9593\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-BykuMIJyOE\">\u7e3d\u7d50<\/h2>\n<p>HOUR()\u51fd\u6578\u5728MySQL\u4e2d\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u8f15\u9b06\u5730\u5f9e\u6642\u9593\u6216\u65e5\u671f\u6642\u9593\u503c\u4e2d\u63d0\u53d6\u5c0f\u6642\u90e8\u5206\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u5176\u4ed6\u61c9\u7528\u5834\u666f\u4e2d\uff0cHOUR()\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u4fbf\u5229\u7684\u652f\u6301\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u7684\u7528\u6236\u4f86\u8aaa\uff0c\u4e86\u89e3\u4e26\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\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\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f\u500b\u4eba\u9805\u76ee\u9084\u662f\u4f01\u696d\u61c9\u7528\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684HOUR()\u51fd\u6578\uff0c\u8f15\u9b06\u63d0\u53d6\u6642\u9593\u6578\u64da\u4e2d\u7684\u5c0f\u6642\u90e8\u5206\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-78632","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78632","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=78632"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78632\/revisions"}],"predecessor-version":[{"id":78633,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78632\/revisions\/78633"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78632"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78632"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78632"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}