如何在ORDER BY子句中使用组函数?
我们可以使用ORDER BY子句中的组函数对结果集组进行排序。默认情况下,排序顺序是递增的,但是我们可以使用DESC关键字将其反转。
示例
mysql> Select designation, YEAR(Doj), count(*) from employees GROUP BY designation, YEAR(DoJ) ORDER BY Count(*) DESC;+-------------+-----------+----------+
| designation | YEAR(Doj) | count(*) |
+-------------+-----------+----------+
| Prof | 2009 | 2 |
| Asst.Prof | 2015 | 1 |
| Asst.Prof | 2016 | 1 |
| Prof | 2010 | 1 |
| Asso.Prof | 2013 | 1 |
+-------------+-----------+----------+
5 rows in set (0.00 sec)
mysql> Select designation, YEAR(Doj), count(*) from employees GROUP BY designation, YEAR(DoJ) ORDER BY designation DESC;
+-------------+-----------+----------+
| designation | YEAR(Doj) | count(*) |
+-------------+-----------+----------+
| Prof | 2009 | 2 |
| Prof | 2010 | 1 |
| Asst.Prof | 2015 | 1 |
| Asst.Prof | 2016 | 1 |
| Asso.Prof | 2013 | 1 |
+-------------+-----------+----------+
5 rows in set (0.00 sec)
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