{"id":76600,"date":"2024-10-16T08:12:18","date_gmt":"2024-10-16T00:12:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/76600\/"},"modified":"2024-10-16T08:12:18","modified_gmt":"2024-10-16T00:12:18","slug":"mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%af%a6%e7%8f%be%e8%a1%a8%e4%b8%ad%e5%8f%96%e5%87%ba%e7%9a%84%e9%9a%a8%e6%a9%9f%e6%95%b8%e6%93%9a%e6%93%8d%e4%bd%9c%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/76600\/","title":{"rendered":"MySQL\u6578\u64da\u5eab\u5be6\u73fe\u8868\u4e2d\u53d6\u51fa\u7684\u96a8\u6a5f\u6578\u64da\u64cd\u4f5c\u6d41\u7a0b"},"content":{"rendered":"

MySQL\u6578\u64da\u5eab\u5be6\u73fe\u8868\u4e2d\u53d6\u51fa\u7684\u96a8\u6a5f\u6578\u64da\u64cd\u4f5c\u6d41\u7a0b<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u96a8\u6a5f\u6578\u64da\u7684\u63d0\u53d6\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u9032\u884c\u6e2c\u8a66\u3001\u62bd\u6a23\u6216\u96a8\u6a5f\u63a8\u85a6\u7684\u60c5\u6cc1\u4e0b\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u5f9e\u8868\u4e2d\u96a8\u6a5f\u9078\u53d6\u6578\u64da\u7684\u529f\u80fd\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u7684\u64cd\u4f5c\u6d41\u7a0b\u3002<\/p>\n

\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u662f\u6307\u5f9e\u6578\u64da\u5eab\u8868\u4e2d\u96a8\u6a5f\u9078\u64c7\u4e00\u689d\u6216\u591a\u689d\u8a18\u9304\u3002\u9019\u4e00\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u5230\u96a8\u6a5f\u6578\u751f\u6210\u548c\u6578\u64da\u67e5\u8a62\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u51fd\u6578\u548c\u67e5\u8a62\u8a9e\u53e5\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\uff0c\u6700\u5e38\u7528\u7684\u5305\u62ec ORDER BY RAND()<\/code> \u548c LIMIT<\/code> \u5b50\u53e5\u3002<\/p>\n

\u4f7f\u7528ORDER BY RAND()\u65b9\u6cd5<\/h2>\n

\u6700\u7c21\u55ae\u7684\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u65b9\u6cd5\u662f\u4f7f\u7528 ORDER BY RAND()<\/code>\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT * FROM \u8868\u540d ORDER BY RAND() LIMIT \u6578\u91cf;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0c\u8868\u540d<\/code>\u662f\u4f60\u8981\u67e5\u8a62\u7684\u6578\u64da\u8868\uff0c\u6578\u91cf<\/code>\u662f\u4f60\u5e0c\u671b\u96a8\u6a5f\u63d0\u53d6\u7684\u8a18\u9304\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u500b\u540d\u70ba users<\/code> \u7684\u8868\uff0c\u4e26\u5e0c\u671b\u96a8\u6a5f\u9078\u53d65\u689d\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
SELECT * FROM users ORDER BY RAND() LIMIT 5;<\/code><\/pre>\n
\u6027\u80fd\u8003\u91cf<\/h3>\n
\u96d6\u7136 ORDER BY RAND()<\/code> \u65b9\u6cd5\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002\u56e0\u70ba\u9019\u500b\u65b9\u6cd5\u9700\u8981\u5c0d\u6574\u500b\u8868\u9032\u884c\u6392\u5e8f\uff0c\u9019\u5728\u6578\u64da\u91cf\u8f03\u5927\u6642\u6703\u5c0e\u81f4\u67e5\u8a62\u901f\u5ea6\u8b8a\u6162\u3002<\/p>\n
\u4f7f\u7528\u5b50\u67e5\u8a62\u548cLIMIT\u65b9\u6cd5<\/h2>\n
\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u751f\u6210\u96a8\u6a5f\u6578\uff0c\u7136\u5f8c\u6839\u64da\u9019\u500b\u96a8\u6a5f\u6578\u4f86\u9078\u53d6\u8a18\u9304\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
SELECT * FROM \u8868\u540d WHERE id >= (SELECT FLOOR(RAND() * (SELECT COUNT(*) FROM \u8868\u540d))) LIMIT 1;<\/code><\/pre>\n
\u9019\u88e1\uff0cid<\/code> \u662f\u8868\u4e2d\u7684\u4e3b\u9375\uff0c\u9019\u500b\u67e5\u8a62\u9996\u5148\u8a08\u7b97\u51fa\u8868\u4e2d\u8a18\u9304\u7684\u7e3d\u6578\uff0c\u7136\u5f8c\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u6578\uff0c\u6700\u5f8c\u6839\u64da\u9019\u500b\u96a8\u6a5f\u6578\u4f86\u9078\u53d6\u4e00\u689d\u8a18\u9304\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5c0d\u6574\u500b\u8868\u9032\u884c\u6392\u5e8f\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n
\u4f7f\u7528JOIN\u548cUNION\u65b9\u6cd5<\/h2>\n
\u5982\u679c\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u96a8\u6a5f\u9078\u53d6\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528 JOIN<\/code> \u6216 UNION<\/code> \u65b9\u6cd5\u3002\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5c07\u591a\u500b\u8868\u7684\u6578\u64da\u5408\u4f75\uff0c\u7136\u5f8c\u518d\u9032\u884c\u96a8\u6a5f\u9078\u53d6\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM (SELECT * FROM \u88681 UNION SELECT * FROM \u88682) AS combined ORDER BY RAND() LIMIT \u6578\u91cf;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u5f9e \u88681<\/code> \u548c \u88682<\/code> \u4e2d\u96a8\u6a5f\u9078\u53d6\u6578\u64da\uff0c\u4e26\u4e14\u53ef\u4ee5\u6839\u64da\u9700\u8981\u8abf\u6574\u9078\u53d6\u7684\u6578\u91cf\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u7684\u65b9\u6cd5\u6709\u591a\u7a2e\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u548c\u6578\u64da\u91cf\u7684\u5927\u5c0f\uff0c\u53ef\u4ee5\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u5f0f\u3002\u7121\u8ad6\u662f\u4f7f\u7528 ORDER BY RAND()<\/code> \u9084\u662f\u5176\u4ed6\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u4e86\u89e3\u9019\u4e9b\u64cd\u4f5c\u6d41\u7a0b\u5c07\u6709\u52a9\u65bc\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 \u9999\u6e2fVPS<\/a> \u4f86\u6258\u7ba1\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3MySQL\u6578\u64da\u5eab\u4e2d\u96a8\u6a5f\u6578\u64da\u63d0\u53d6\u7684\u64cd\u4f5c\u6d41\u7a0b\uff0c\u7c21\u5316\u67e5\u8a62\u4e26\u63d0\u5347\u6578\u64da\u5206\u6790\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-76600","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76600","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=76600"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76600\/revisions"}],"predecessor-version":[{"id":76601,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/76600\/revisions\/76601"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=76600"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=76600"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=76600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}