MySql从表结果集中随机取一条数据_MySQL

MySql从表结果集中随机取一条数据

[sql] Select * from (Select (@rowNo :=@rowNo+1) AS rowno, pwd from pur_admininfo, (Select @rowNo := 0) b) tmp where rowno=(Select Round(Rand() * 10000000 % (Select Count(*) from pur_admininfo))) limit 1;  

为了可以随机得到表结果集中的任何一条记录，这里乘以10000000，然后再取模，但不知道为什么更大的数字就不行了。

另一种实现方式：

[sql] SELECT * FROM pur_admininfo AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(rid) FROM pur_admininfo) - (SELECT MIN(rid) FROM pur_admininfo)) + (SELECT MIN(rid) FROM pur_admininfo)) AS rid) AS t2 WHERE t1.rid >= t2.rid ORDER BY t1.rid LIMIT 1;