mysql随机查询数据

MySql查询随机几条数据

想到了  Max  RAND  这几个函数

用以下2种办法都可以实现查询。  速度还行。

几十万数据左右， 没有什么问题。

SELECT * FROM `news`

WHERE id >= (SELECT floor(RAND() * (SELECT MAX(id) FROM `news`))) 

LIMIT 10;

SELECT *

FROM `news` AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(id) FROM `news`)-(SELECT MIN(id) FROM `news`))+(SELECT MIN(id) FROM `news`)) AS id) AS t2

WHERE t1.id >= t2.id

 LIMIT 10;