{"id":144029,"date":"2024-11-01T03:19:19","date_gmt":"2024-10-31T19:19:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144029\/"},"modified":"2024-11-01T03:19:20","modified_gmt":"2024-10-31T19:19:20","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8%e5%a4%a7%e5%85%a8%ef%bc%8c%e4%b8%8d%e7%94%a8%e5%86%8d%e6%93%94%e5%bf%83%e6%99%82%e9%96%93%e5%95%8f%e9%a1%8c%ef%bc%81-sql-%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144029\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u6642\u9593\u51fd\u6578\u5927\u5168\uff0c\u4e0d\u7528\u518d\u64d4\u5fc3\u6642\u9593\u554f\u984c\uff01 (sql \u6578\u64da\u5eab\u6642\u9593\u51fd\u6578)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8%e5%a4%a7%e5%85%a8%ef%bc%8c%e4%b8%8d%e7%94%a8%e5%86%8d%e6%93%94%e5%bf%83%e6%99%82%e9%96%93%e5%95%8f%e9%a1%8c%ef%bc%81-KaMGlDQOnW\">SQL \u6578\u64da\u5eab\u6642\u9593\u51fd\u6578\u5927\u5168\uff0c\u4e0d\u7528\u518d\u64d4\u5fc3\u6642\u9593\u554f\u984c\uff01<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6642\u9593\u7684\u8655\u7406\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u8a18\u9304\u6578\u64da\u7684\u5275\u5efa\u6642\u9593\u3001\u66f4\u65b0\u6642\u9593\uff0c\u9084\u662f\u9032\u884c\u6642\u9593\u7bc4\u570d\u67e5\u8a62\uff0cSQL \u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u6642\u9593\u51fd\u6578\u4f86\u5e6b\u52a9\u958b\u767c\u8005\u9ad8\u6548\u5730\u7ba1\u7406\u6642\u9593\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u6578\u64da\u5eab\u6642\u9593\u51fd\u6578\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e9b\u5de5\u5177\u3002<\/p>\n<h2 id=\"1-%e7%95%b6%e5%89%8d%e6%99%82%e9%96%93%e5%87%bd%e6%95%b8-KaMGlDQOnW\">1. \u7576\u524d\u6642\u9593\u51fd\u6578<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u7372\u53d6\u7576\u524d\u6642\u9593\u7684\u51fd\u6578\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><code>NOW()<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><code>CURRENT_DATE()<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u65e5\u671f\u3002<\/li>\n<li><code>CURRENT_TIME()<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u6642\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528 <code>NOW()<\/code> \u51fd\u6578\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT NOW();<\/code><\/pre>\n<h2 id=\"2-%e6%97%a5%e6%9c%9f%e5%92%8c%e6%99%82%e9%96%93%e7%9a%84%e5%8a%a0%e6%b8%9b-KaMGlDQOnW\">2. \u65e5\u671f\u548c\u6642\u9593\u7684\u52a0\u6e1b<\/h2>\n<p>\u5728\u8655\u7406\u6642\u9593\u6642\uff0c\u7d93\u5e38\u9700\u8981\u5c0d\u65e5\u671f\u548c\u6642\u9593\u9032\u884c\u52a0\u6e1b\u64cd\u4f5c\u3002SQL \u63d0\u4f9b\u4e86 <code>DATE_ADD()<\/code> \u548c <code>DATE_SUB()<\/code> \u51fd\u6578\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\u3002<\/p>\n<ul>\n<li><code>DATE_ADD(date, INTERVAL expr unit)<\/code>\uff1a\u5c07\u6307\u5b9a\u7684\u6642\u9593\u9593\u9694\u52a0\u5230\u65e5\u671f\u4e0a\u3002<\/li>\n<li><code>DATE_SUB(date, INTERVAL expr unit)<\/code>\uff1a\u5f9e\u65e5\u671f\u4e2d\u6e1b\u53bb\u6307\u5b9a\u7684\u6642\u9593\u9593\u9694\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u52a0\u4e0a 10 \u5929\uff1a<\/p>\n<pre><code>SELECT DATE_ADD(NOW(), INTERVAL 10 DAY);<\/code><\/pre>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e6%a0%bc%e5%bc%8f%e5%8c%96-KaMGlDQOnW\">3. \u65e5\u671f\u683c\u5f0f\u5316<\/h2>\n<p>\u5728\u986f\u793a\u65e5\u671f\u548c\u6642\u9593\u6642\uff0c\u683c\u5f0f\u5316\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002SQL \u63d0\u4f9b\u4e86 <code>DATE_FORMAT()<\/code> \u51fd\u6578\u4f86\u683c\u5f0f\u5316\u65e5\u671f\u3002<\/p>\n<p>\u9019\u500b\u51fd\u6578\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DATE_FORMAT(date, format)<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07\u7576\u524d\u65e5\u671f\u683c\u5f0f\u5316\u70ba &#8216;YYYY-MM-DD&#8217; \u7684\u5f62\u5f0f\uff1a<\/p>\n<pre><code>SELECT DATE_FORMAT(NOW(), '%Y-%m-%d');<\/code><\/pre>\n<h2 id=\"4-%e6%8f%90%e5%8f%96%e6%97%a5%e6%9c%9f%e9%83%a8%e5%88%86-KaMGlDQOnW\">4. \u63d0\u53d6\u65e5\u671f\u90e8\u5206<\/h2>\n<p>\u6709\u6642\u5019\uff0c\u6211\u5011\u9700\u8981\u5f9e\u65e5\u671f\u4e2d\u63d0\u53d6\u7279\u5b9a\u7684\u90e8\u5206\uff0c\u4f8b\u5982\u5e74\u3001\u6708\u3001\u65e5\u7b49\u3002SQL \u63d0\u4f9b\u4e86\u591a\u500b\u51fd\u6578\u4f86\u5be6\u73fe\u9019\u4e00\u9700\u6c42\uff1a<\/p>\n<ul>\n<li><code>YEAR(date)<\/code>\uff1a\u63d0\u53d6\u5e74\u4efd\u3002<\/li>\n<li><code>MONTH(date)<\/code>\uff1a\u63d0\u53d6\u6708\u4efd\u3002<\/li>\n<li><code>DAY(date)<\/code>\uff1a\u63d0\u53d6\u65e5\u671f\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u63d0\u53d6\u7576\u524d\u65e5\u671f\u7684\u5e74\u4efd\uff1a<\/p>\n<pre><code>SELECT YEAR(NOW());<\/code><\/pre>\n<h2 id=\"5-%e6%99%82%e9%96%93%e6%88%b3%e7%9a%84%e8%99%95%e7%90%86-KaMGlDQOnW\">5. \u6642\u9593\u6233\u7684\u8655\u7406<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u6642\u9593\u6233\u662f\u7528\u4f86\u8a18\u9304\u4e8b\u4ef6\u767c\u751f\u7684\u6642\u9593\u3002SQL \u63d0\u4f9b\u4e86 <code>UNIX_TIMESTAMP()<\/code> \u548c <code>FROM_UNIXTIME()<\/code> \u51fd\u6578\u4f86\u8655\u7406\u6642\u9593\u6233\u3002<\/p>\n<ul>\n<li><code>UNIX_TIMESTAMP()<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u6642\u9593\u7684 UNIX \u6642\u9593\u6233\u3002<\/li>\n<li><code>FROM_UNIXTIME(unix_timestamp)<\/code>\uff1a\u5c07 UNIX \u6642\u9593\u6233\u8f49\u63db\u70ba\u65e5\u671f\u6642\u9593\u683c\u5f0f\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u7372\u53d6\u7576\u524d\u7684 UNIX \u6642\u9593\u6233\uff1a<\/p>\n<pre><code>SELECT UNIX_TIMESTAMP();<\/code><\/pre>\n<h2 id=\"6-%e7%b5%90%e8%ab%96-KaMGlDQOnW\">6. \u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1 SQL \u6578\u64da\u5eab\u4e2d\u7684\u6642\u9593\u51fd\u6578\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u9ad8\u6548\u5730\u8655\u7406\u6642\u9593\u6578\u64da\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6e96\u78ba\u6027\u3002\u7121\u8ad6\u662f\u9032\u884c\u6642\u9593\u8a08\u7b97\u3001\u683c\u5f0f\u5316\u9084\u662f\u63d0\u53d6\u65e5\u671f\u90e8\u5206\uff0c\u9019\u4e9b\u51fd\u6578\u90fd\u80fd\u63d0\u4f9b\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u4e14\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">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 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u6700\u4f73\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22SQL\u6578\u64da\u5eab\u4e2d\u7684\u6642\u9593\u51fd\u6578\u5927\u5168\uff0c\u8f15\u9b06\u89e3\u6c7a\u6642\u9593\u76f8\u95dc\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff01<\/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-144029","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144029","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=144029"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144029\/revisions"}],"predecessor-version":[{"id":144030,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144029\/revisions\/144030"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144029"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144029"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144029"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}