mysql随机抽取数据

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了mysql随机抽取数据，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含1396字，纯文字阅读大概需要2分钟。

内容图文

慢 SELECT * FROM table_name ORDER BY rand() LIMIT 5; -- 较慢 SELECT * FROM `table` WHERE id >= (SELECT floor( RAND() * ((SELECT MAX(id) FROM `table`)-(SELECT MIN(id) FROM `table`)) + (SELECT MIN(id) FROM `table`))) ORDER BY id LIMIT 1; -- 快 `table 有 id 字段 SELECT * FROM `table` AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM `table`)-(SELECT MIN(id) FROM `table`))+(SELECT MIN(id) FROM `table`)) AS id) AS t2 WHERE t1.id >= t2.id ORDER BY t1.id LIMIT 1; -- 快 `table 没有有 id 字段 select * from (select @rownum:=@rownum + 1 as id,value from `table`,(select @rownum:=0) as a) as t1 join ( select round( rand() * ( (select max(b.id) from (select @rownum_max:=@rownum_max + 1 as id,value from `table`,(select @rownum_max:=0) as a) as b ) - (select min(b.id) from (select @rownum_min:=@rownum_min + 1 as id,value from `table`,(select @rownum_min:=0) as a) as b ) )) + (select min(b.id) from (select @rownum_min1:=@rownum_min1 + 1 as id,value from `table`,(select @rownum_min1:=0) as a) as b ) as id ) as t2 on t1.id>= t2.id order by t1.id limit 1

 

缺点: 

每次查询后会获得连续的n条数据

解决办法:

每次查一条数据,重复查询n 次

 

mysql随机抽取数据

标签：position   字段   abs   mysq   table   随机   取数据   top   sele   

本文系统来源：https://www.cnblogs.com/feiquan/p/12368131.html

内容总结

以上是互联网集市为您收集整理的mysql随机抽取数据全部内容，希望文章能够帮你解决mysql随机抽取数据所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

---