如何在 ORDER BY 子句中使用 RAND() 函数来随机排列 MySQL 行集?
当我们在 MySQL ORDER BY 子句中使用 RAND() 函数时,结果集将有一组随机排列的行。换句话说,结果集将是随机排列的。为了理解它,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 BY RAND() 来随机排列结果集中的行集 -
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)
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