当我们将 MySQL ORDER BY 子句与 RAND() 函数一起使用时,结果集将具有经过打乱的行集。换句话说,结果集将按随机顺序排列。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)
以上是如何在 ORDER BY 子句中使用 RAND() 函数来打乱 MySQL 行集?的详细内容。更多信息请关注PHP中文网其他相关文章!