mysql 随机选取一条符合条件的记录

暂时记录下：

SELECT *  FROM `kw_user` AS t1 JOIN ( SELECT ROUND( RAND( ) * ( ( SELECT MAX( id ) FROM `kw_user` ) - ( SELECT MIN( id ) FROM `kw_user` ) ) + ( SELECT MIN( id ) FROM `kw_user` )  ) AS id  ) AS t2  WHERE t1.id >= t2.id  AND 加上删选条件  ORDER BY t1.id  LIMIT 1;