{"id":79480,"date":"2024-10-16T13:09:14","date_gmt":"2024-10-16T05:09:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79480\/"},"modified":"2024-10-16T13:09:15","modified_gmt":"2024-10-16T05:09:15","slug":"mysql%e6%8c%87%e4%bb%a4-rand%ef%bc%88%e9%9a%a8%e6%a9%9f%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79480\/","title":{"rendered":"MySQL\u6307\u4ee4: RAND()\uff08\u96a8\u6a5f\u6578\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-rand%ef%bc%88%e9%9a%a8%e6%a9%9f%e6%95%b8%ef%bc%89-slYxpWGtnS\">MySQL\u6307\u4ee4: RAND()\uff08\u96a8\u6a5f\u6578\uff09<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u96a8\u6a5f\u6578\u7684\u751f\u6210\u5e38\u5e38\u662f\u8a31\u591a\u61c9\u7528\u7a0b\u5e8f\u7684\u6838\u5fc3\u9700\u6c42\u4e4b\u4e00\u3002MySQL\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u51fd\u6578\u2014\u2014<code>RAND()<\/code>\uff0c\u7528\u65bc\u751f\u6210\u96a8\u6a5f\u6578\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e<code>RAND()<\/code>\u7684\u7528\u6cd5\u3001\u7279\u6027\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afrand%e5%87%bd%e6%95%b8%ef%bc%9f-slYxpWGtnS\">\u4ec0\u9ebc\u662fRAND()\u51fd\u6578\uff1f<\/h2>\n<p><code>RAND()<\/code>\u662f\u4e00\u500b\u5167\u5efa\u7684MySQL\u51fd\u6578\uff0c\u7528\u65bc\u751f\u6210\u4e00\u500b\u4ecb\u65bc0\u548c1\u4e4b\u9593\u7684\u96a8\u6a5f\u6d6e\u9ede\u6578\u3002\u6bcf\u6b21\u8abf\u7528\u6b64\u51fd\u6578\u6642\uff0c\u8fd4\u56de\u7684\u6578\u503c\u90fd\u662f\u96a8\u6a5f\u7684\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u9700\u8981\u96a8\u6a5f\u5316\u6578\u64da\u7684\u5834\u666f\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"rand%e7%9a%84%e5%9f%ba%e6%9c%ac%e7%94%a8%e6%b3%95-slYxpWGtnS\">RAND()\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n<p>\u4f7f\u7528<code>RAND()<\/code>\u51fd\u6578\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT RAND();<\/code><\/pre>\n<p>\u9019\u689d\u6307\u4ee4\u5c07\u8fd4\u56de\u4e00\u500b\u96a8\u6a5f\u7684\u6d6e\u9ede\u6578\u3002\u4f8b\u5982\uff0c\u57f7\u884c\u5f8c\u53ef\u80fd\u5f97\u5230\u7684\u7d50\u679c\u662f\uff1a<\/p>\n<pre><code>0.123456789<\/code><\/pre>\n<h2 id=\"%e7%94%9f%e6%88%90%e7%af%84%e5%9c%8d%e5%85%a7%e7%9a%84%e9%9a%a8%e6%a9%9f%e6%95%b8-slYxpWGtnS\">\u751f\u6210\u7bc4\u570d\u5167\u7684\u96a8\u6a5f\u6578<\/h2>\n<p>\u5982\u679c\u9700\u8981\u751f\u6210\u7279\u5b9a\u7bc4\u570d\u5167\u7684\u96a8\u6a5f\u6578\uff0c\u53ef\u4ee5\u901a\u904e\u6578\u5b78\u904b\u7b97\u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u751f\u6210\u4ecb\u65bc1\u5230100\u4e4b\u9593\u7684\u96a8\u6a5f\u6574\u6578\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT FLOOR(1 + (RAND() * 100));<\/code><\/pre>\n<p>\u9019\u88e1\uff0c<code>FLOOR()<\/code>\u51fd\u6578\u7528\u65bc\u5c07\u6d6e\u9ede\u6578\u5411\u4e0b\u53d6\u6574\uff0c\u5f9e\u800c\u7372\u5f97\u6574\u6578\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8rand%e9%80%b2%e8%a1%8c%e9%9a%a8%e6%a9%9f%e9%81%b8%e6%93%87-slYxpWGtnS\">\u4f7f\u7528RAND()\u9032\u884c\u96a8\u6a5f\u9078\u64c7<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c<code>RAND()<\/code>\u5e38\u7528\u65bc\u96a8\u6a5f\u9078\u64c7\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8868\uff0c\u60f3\u8981\u96a8\u6a5f\u9078\u64c7\u4e00\u4f4d\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY RAND() LIMIT 1;<\/code><\/pre>\n<p>\u9019\u689d\u6307\u4ee4\u5c07\u96a8\u6a5f\u9078\u64c7\u4e00\u4f4d\u7528\u6236\u4e26\u8fd4\u56de\u5176\u6240\u6709\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-slYxpWGtnS\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136<code>RAND()<\/code>\u51fd\u6578\u975e\u5e38\u65b9\u4fbf\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u4f7f\u7528\u6642\u9700\u8981\u8b39\u614e\u3002\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\u4f7f\u7528<code>ORDER BY RAND()<\/code>\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u56e0\u70baMySQL\u9700\u8981\u5c0d\u6574\u500b\u8868\u9032\u884c\u6392\u5e8f\u3002\u5c0d\u65bc\u5927\u6578\u64da\u96c6\uff0c\u5efa\u8b70\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\u4f86\u5be6\u73fe\u96a8\u6a5f\u9078\u64c7\uff0c\u4f8b\u5982\u4f7f\u7528\u96a8\u6a5fID\u6216\u5176\u4ed6\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-slYxpWGtnS\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u7684<code>RAND()<\/code>\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u4e14\u9748\u6d3b\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5728\u591a\u7a2e\u5834\u666f\u4e2d\u751f\u6210\u96a8\u6a5f\u6578\u3002\u7121\u8ad6\u662f\u7528\u65bc\u96a8\u6a5f\u9078\u64c7\u6578\u64da\u9084\u662f\u751f\u6210\u96a8\u6a5f\u6578\u503c\uff0c<code>RAND()<\/code>\u90fd\u80fd\u63d0\u4f9b\u7c21\u55ae\u800c\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u6642\u9700\u8003\u616e\u6027\u80fd\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a> \u65b9\u6848\uff0c\u70ba\u60a8\u7684\u9805\u76ee\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4RAND()\uff0c\u7528\u65bc\u751f\u6210\u96a8\u6a5f\u6578\uff0c\u63d0\u5347\u6578\u64da\u96a8\u6a5f\u6027\u548c\u67e5\u8a62\u591a\u6a23\u6027\uff0c\u9069\u7528\u65bc\u5404\u7a2e\u6578\u64da\u5eab\u61c9\u7528\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-79480","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79480","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=79480"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79480\/revisions"}],"predecessor-version":[{"id":79481,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79480\/revisions\/79481"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79480"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}