{"id":76138,"date":"2024-10-16T04:10:18","date_gmt":"2024-10-15T20:10:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76138\/"},"modified":"2024-10-16T04:10:18","modified_gmt":"2024-10-15T20:10:18","slug":"mysql%e5%85%a7%e7%bd%ae%e5%87%bd%e6%95%b8%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8%e8%a9%b3%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76138\/","title":{"rendered":"MySQL\u5167\u7f6e\u51fd\u6578\u4e2d\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u8a73\u89e3"},"content":{"rendered":"<h1 id=\"mysql%e5%85%a7%e7%bd%ae%e5%87%bd%e6%95%b8%e4%b8%ad%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8%e8%a9%b3%e8%a7%a3-cWSZQIcRvE\">MySQL\u5167\u7f6e\u51fd\u6578\u4e2d\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u8a73\u89e3<\/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\u5167\u7f6e\u51fd\u6578\u4f86\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u9032\u884c\u6578\u64da\u67e5\u8a62\uff0c\u9084\u80fd\u5920\u5728\u6578\u64da\u5206\u6790\u4e2d\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39MySQL\u4e2d\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"1-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-cWSZQIcRvE\">1. \u65e5\u671f\u548c\u6642\u9593\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5728\u4f7f\u7528MySQL\u9032\u884c\u65e5\u671f\u548c\u6642\u9593\u7684\u64cd\u4f5c\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3MySQL\u652f\u6301\u7684\u65e5\u671f\u548c\u6642\u9593\u6578\u64da\u985e\u578b\u3002\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>DATE<\/code>\uff1a\u7528\u65bc\u5b58\u5132\u65e5\u671f\uff0c\u683c\u5f0f\u70ba&#8217;YYYY-MM-DD&#8217;\u3002<\/li>\n<li><code>TIME<\/code>\uff1a\u7528\u65bc\u5b58\u5132\u6642\u9593\uff0c\u683c\u5f0f\u70ba&#8217;HH:MM:SS&#8217;\u3002<\/li>\n<li><code>DATETIME<\/code>\uff1a\u7528\u65bc\u5b58\u5132\u65e5\u671f\u548c\u6642\u9593\uff0c\u683c\u5f0f\u70ba&#8217;YYYY-MM-DD HH:MM:SS&#8217;\u3002<\/li>\n<li><code>TIMESTAMP<\/code>\uff1a\u985e\u4f3c\u65bcDATETIME\uff0c\u4f46\u6703\u6839\u64da\u6642\u5340\u81ea\u52d5\u8abf\u6574\u3002<\/li>\n<li><code>YEAR<\/code>\uff1a\u7528\u65bc\u5b58\u5132\u5e74\u4efd\uff0c\u683c\u5f0f\u70ba&#8217;YYYY&#8217;\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e5%b8%b8%e7%94%a8%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-cWSZQIcRvE\">2. \u5e38\u7528\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578<\/h2>\n<p>MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u4f86\u64cd\u4f5c\u548c\u683c\u5f0f\u5316\u65e5\u671f\u548c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u51fd\u6578\uff1a<\/p>\n<h3 id=\"2-1-now-cWSZQIcRvE\">2.1 NOW()<\/h3>\n<p><code>NOW()<\/code>\u51fd\u6578\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/p>\n<pre><code>SELECT NOW();<\/code><\/pre>\n<h3 id=\"2-2-curdate-%e5%92%8c-curtime-cWSZQIcRvE\">2.2 CURDATE() \u548c CURTIME()<\/h3>\n<p><code>CURDATE()<\/code>\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\uff0c\u800c<code>CURTIME()<\/code>\u8fd4\u56de\u7576\u524d\u7684\u6642\u9593\u3002<\/p>\n<pre><code>SELECT CURDATE(), CURTIME();<\/code><\/pre>\n<h3 id=\"2-3-date_format-cWSZQIcRvE\">2.3 DATE_FORMAT()<\/h3>\n<p><code>DATE_FORMAT()<\/code>\u51fd\u6578\u7528\u65bc\u683c\u5f0f\u5316\u65e5\u671f\u3002\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u683c\u5f0f\u5316\u9078\u9805\u4f86\u986f\u793a\u65e5\u671f\u3002<\/p>\n<pre><code>SELECT DATE_FORMAT(NOW(), '%Y-%m-%d %H:%i:%s');<\/code><\/pre>\n<h3 id=\"2-4-date_add-%e5%92%8c-date_sub-cWSZQIcRvE\">2.4 DATE_ADD() \u548c DATE_SUB()<\/h3>\n<p><code>DATE_ADD()<\/code>\u548c<code>DATE_SUB()<\/code>\u51fd\u6578\u7528\u65bc\u5728\u65e5\u671f\u4e0a\u52a0\u4e0a\u6216\u6e1b\u53bb\u6307\u5b9a\u7684\u6642\u9593\u9593\u9694\u3002<\/p>\n<pre><code>SELECT DATE_ADD(NOW(), INTERVAL 1 DAY); -- \u52a0\u4e00\u5929\nSELECT DATE_SUB(NOW(), INTERVAL 1 MONTH); -- \u6e1b\u4e00\u500b\u6708<\/code><\/pre>\n<h3 id=\"2-5-datediff-cWSZQIcRvE\">2.5 DATEDIFF()<\/h3>\n<p><code>DATEDIFF()<\/code>\u51fd\u6578\u7528\u65bc\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u5929\u6578\u5dee\u3002<\/p>\n<pre><code>SELECT DATEDIFF('2023-12-31', '2023-01-01');<\/code><\/pre>\n<h3 id=\"2-6-extract-cWSZQIcRvE\">2.6 EXTRACT()<\/h3>\n<p><code>EXTRACT()<\/code>\u51fd\u6578\u7528\u65bc\u5f9e\u65e5\u671f\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\uff0c\u4f8b\u5982\u5e74\u4efd\u3001\u6708\u4efd\u6216\u65e5\u3002<\/p>\n<pre><code>SELECT EXTRACT(YEAR FROM NOW()); -- \u63d0\u53d6\u7576\u524d\u5e74\u4efd<\/code><\/pre>\n<h2 id=\"3-%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e7%a4%ba%e4%be%8b-cWSZQIcRvE\">3. \u5be6\u969b\u61c9\u7528\u793a\u4f8b<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u9019\u4e9b\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u5834\u666f\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u7db2\u7ad9\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\u4f86\u8a08\u7b97\u8a02\u55ae\u7684\u8655\u7406\u6642\u9593\uff0c\u6216\u662f\u751f\u6210\u5831\u544a\u4ee5\u5206\u6790\u92b7\u552e\u8da8\u52e2\u3002<\/p>\n<pre><code>SELECT COUNT(*) AS total_orders, DATE_FORMAT(order_date, '%Y-%m') AS month\nFROM orders\nGROUP BY month;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u6708\u4efd\u7684\u8a02\u55ae\u7e3d\u6578\uff0c\u5e6b\u52a9\u5546\u5bb6\u5206\u6790\u92b7\u552e\u8da8\u52e2\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-cWSZQIcRvE\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u5de5\u5177\u4f86\u8655\u7406\u548c\u5206\u6790\u6642\u9593\u6578\u64da\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u67e5\u8a62\u9084\u662f\u5831\u544a\u751f\u6210\u4e2d\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u5920\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u4e86\u89e3\u9019\u4e9b\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eMySQL\u5167\u7f6e\u7684\u65e5\u671f\u548c\u6642\u9593\u51fd\u6578\uff0c\u4e86\u89e3\u5176\u7528\u6cd5\u53ca\u61c9\u7528\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-76138","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76138","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=76138"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76138\/revisions"}],"predecessor-version":[{"id":76139,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76138\/revisions\/76139"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}