{"id":183004,"date":"2024-11-10T01:08:20","date_gmt":"2024-11-09T17:08:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183004\/"},"modified":"2024-11-10T01:08:21","modified_gmt":"2024-11-09T17:08:21","slug":"%e5%af%a6%e7%8f%bemysql%e9%9a%a8%e6%a9%9f%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a%e7%9a%84%e6%ad%a5%e9%a9%9f%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183004\/","title":{"rendered":"\u5be6\u73feMySQL\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u6b65\u9a5f\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"

\u5be6\u73feMySQL\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u6b65\u9a5f\u6709\u54ea\u4e9b\uff1f<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u96a8\u6a5f\u9078\u53d6\u6a23\u672c\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\u96a8\u6a5f\u67e5\u8a62\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u6b65\u9a5f\u548c\u6280\u5de7\u3002<\/p>\n

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

\u6700\u7c21\u55ae\u7684\u96a8\u6a5f\u67e5\u8a62\u65b9\u6cd5\u662f\u4f7f\u7528ORDER BY RAND()<\/code>\u8a9e\u53e5\u3002\u9019\u7a2e\u65b9\u6cd5\u6703\u96a8\u6a5f\u6392\u5217\u67e5\u8a62\u7d50\u679c\uff0c\u7136\u5f8c\u9078\u53d6\u6240\u9700\u7684\u884c\u6578\u3002<\/p>\n

SELECT * FROM your_table ORDER BY RAND() LIMIT 1;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cyour_table<\/code>\u662f\u4f60\u8981\u67e5\u8a62\u7684\u6578\u64da\u8868\uff0c\u9019\u689d\u8a9e\u53e5\u5c07\u96a8\u6a5f\u9078\u53d6\u4e00\u884c\u6578\u64da\u3002\u96d6\u7136\u9019\u7a2e\u65b9\u6cd5\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u5728\u6578\u64da\u91cf\u8f03\u5927\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\uff0c\u56e0\u70baMySQL\u9700\u8981\u5c0d\u6574\u500b\u7d50\u679c\u96c6\u9032\u884c\u96a8\u6a5f\u6392\u5e8f\u3002<\/p>\n
2. \u4f7f\u7528LIMIT\u548cOFFSET<\/h2>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528LIMIT<\/code>\u548cOFFSET<\/code>\u4f86\u96a8\u6a5f\u9078\u53d6\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u9700\u8981\u5148\u8a08\u7b97\u51fa\u6578\u64da\u8868\u4e2d\u7684\u7e3d\u884c\u6578\uff0c\u7136\u5f8c\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u7684\u504f\u79fb\u91cf\u3002<\/p>\n
SET @rand_id = FLOOR(1 + RAND() * (SELECT COUNT(*) FROM your_table));\nSELECT * FROM your_table LIMIT 1 OFFSET @rand_id;<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u8a08\u7b97\u51fa\u6578\u64da\u8868\u7684\u884c\u6578\uff0c\u7136\u5f8c\u751f\u6210\u4e00\u500b\u96a8\u6a5f\u7684\u884c\u865f\uff0c\u6700\u5f8c\u4f7f\u7528LIMIT<\/code>\u548cOFFSET<\/code>\u4f86\u9078\u53d6\u8a72\u884c\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u6027\u80fd\u4e0a\u901a\u5e38\u6bd4ORDER BY RAND()<\/code>\u66f4\u512a\uff0c\u7279\u5225\u662f\u5728\u6578\u64da\u91cf\u8f03\u5927\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n
3. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h2>\n
\u5982\u679c\u4f60\u5e0c\u671b\u5728\u96a8\u6a5f\u67e5\u8a62\u4e2d\u4f7f\u7528\u66f4\u8907\u96dc\u7684\u689d\u4ef6\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5b50\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u8b93\u4f60\u5728\u96a8\u6a5f\u9078\u53d6\u6578\u64da\u7684\u540c\u6642\uff0c\u6eff\u8db3\u7279\u5b9a\u7684\u67e5\u8a62\u689d\u4ef6\u3002<\/p>\n
SELECT * FROM your_table WHERE id IN (SELECT id FROM your_table ORDER BY RAND() LIMIT 5);<\/code><\/pre>\n
\u9019\u689d\u8a9e\u53e5\u5c07\u96a8\u6a5f\u9078\u53d65\u500bID\uff0c\u7136\u5f8c\u5f9e\u539f\u59cb\u8868\u4e2d\u67e5\u8a62\u9019\u4e9bID\u5c0d\u61c9\u7684\u6578\u64da\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u9748\u6d3b\u6027\u8f03\u9ad8\uff0c\u9069\u5408\u9700\u8981\u591a\u689d\u96a8\u6a5f\u6578\u64da\u7684\u5834\u666f\u3002<\/p>\n
4. \u4f7f\u7528\u96a8\u6a5f\u6578\u751f\u6210\u5668<\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f60\u53ef\u80fd\u5e0c\u671b\u4f7f\u7528\u81ea\u5b9a\u7fa9\u7684\u96a8\u6a5f\u6578\u751f\u6210\u5668\u4f86\u9078\u53d6\u6578\u64da\u3002\u9019\u53ef\u4ee5\u901a\u904e\u7de8\u5beb\u5b58\u5132\u904e\u7a0b\u6216\u51fd\u6578\u4f86\u5be6\u73fe\u3002<\/p>\n
CREATE FUNCTION get_random_row() RETURNS INT\nBEGIN\n    DECLARE rand_id INT;\n    SET rand_id = FLOOR(1 + RAND() * (SELECT COUNT(*) FROM your_table));\n    RETURN rand_id;\nEND;\n\nSELECT * FROM your_table LIMIT 1 OFFSET get_random_row();<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5275\u5efa\u4e86\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u8fd4\u56de\u4e00\u500b\u96a8\u6a5f\u884c\u865f\uff0c\u7136\u5f8c\u53ef\u4ee5\u7528\u65bc\u67e5\u8a62\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u52e2\u5728\u65bc\u53ef\u4ee5\u91cd\u8907\u4f7f\u7528\u96a8\u6a5f\u6578\u751f\u6210\u908f\u8f2f\uff0c\u4e26\u4e14\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u64f4\u5c55\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5728MySQL\u4e2d\u5be6\u73fe\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u65b9\u6cd5\u6709\u591a\u7a2e\uff0c\u5f9e\u7c21\u55ae\u7684ORDER BY RAND()<\/code>\u5230\u66f4\u8907\u96dc\u7684\u5b50\u67e5\u8a62\u548c\u81ea\u5b9a\u7fa9\u51fd\u6578\uff0c\u6bcf\u7a2e\u65b9\u6cd5\u90fd\u6709\u5176\u9069\u7528\u7684\u5834\u666f\u548c\u6027\u80fd\u8003\u91cf\u3002\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u5e6b\u52a9\u4f60\u66f4\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u7372\u53d6\u96a8\u6a5f\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u4f86\u642d\u5efa\u4f60\u7684MySQL\u74b0\u5883\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u4f60\u7684\u6578\u64da\u5eab\u6027\u80fd\u7a69\u5b9a\uff0c\u4e26\u80fd\u5920\u8f15\u9b06\u61c9\u5c0d\u96a8\u6a5f\u67e5\u8a62\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5be6\u73feMySQL\u96a8\u6a5f\u67e5\u8a62\u6578\u64da\u7684\u6b65\u9a5f\uff0c\u5305\u62ec\u4f7f\u7528ORDER BY RAND()\u3001LIMIT\u548c\u5176\u4ed6\u6280\u5de7\uff0c\u63d0\u5347\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-183004","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183004","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=183004"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183004\/revisions"}],"predecessor-version":[{"id":183005,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183004\/revisions\/183005"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}