借助与 ORDER BY 子句一起使用的 RAND() 函数，可以在结果集中随机化行集或值集。要理解它，请考虑一个具有以下记录的表“Employee” -
mysql> Select * from employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | Aarav | 65000 | | 5 | Ram | 20000 | | 6 | Mohan | 30000 | | 7 | Aryan | NULL | | 8 | Vinay | NULL | +----+--------+--------+ 8 rows in set (0.00 sec)
现在，下面的查询将使用 ORDER BT RAND() 来打乱结果集中的行集 -
mysql> Select * from Employee ORDER BY RAND(); +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 4 | Aarav | 65000 | | 1 | Gaurav | 50000 | | 3 | Advik | 25000 | | 7 | Aryan | NULL | | 6 | Mohan | 30000 | | 8 | Vinay | NULL | | 5 | Ram | 20000 | | 2 | Rahul | 20000 | +----+--------+--------+ 8 rows in set (0.00 sec)
