该功能的实现基于“mysql 查找结果中自动加序号列 ”
博客文章地址:
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:
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;
没有绝望的处境,只有对处境绝望的人。