如何在 ORDER BY 子句中使用組函式?
我們可以在 ORDER BY 子句中使用組函式對結果集進行排序。預設情況下,排序順序為升序,但我們可以使用 DESC 關鍵字進行倒序。
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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