我如何在ORDER BY子句中使用RAND()函数来随机排列MySQL行集?
当我们将MySQL ORDER BY子句与RAND()
函数一起使用时,结果集将具有经过改组的行集。换句话说,结果集将以随机顺序排列。为了理解它认为表'Employee'具有以下记录-
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 BTRAND()
来随机整理结果集中的行集-
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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