通过将 mysql sum() 函数与 having 子句结合使用，它会根据 having 子句后给出的特定条件过滤结果。要理解上述概念，请考虑一个“employee_tbl”表，该表具有以下记录 -
mysql> select * from employee_tbl;+------+------+------------+--------------------+| id | name | work_date | daily_typing_pages |+------+------+------------+--------------------+| 1 | john | 2007-01-24 | 250 || 2 | ram | 2007-05-27 | 220 || 3 | jack | 2007-05-06 | 170 || 3 | jack | 2007-04-06 | 100 || 4 | jill | 2007-04-06 | 220 || 5 | zara | 2007-06-06 | 300 || 5 | zara | 2007-02-06 | 350 |+------+------+------------+--------------------+7 rows in set (0.00 sec)
现在，下面的查询将使用 having 子句和 sum() 函数来获取超过 250 的 daily_typing_pages 总数。
mysql> select name, sum(daily_typing_pages) from employee_tbl group by name having sum(daily_typing_pages) > 250;+------+-------------------------+| name | sum(daily_typing_pages) |+------+-------------------------+| jack | 270 || zara | 650 |+------+-------------------------+2 rows in set (0.17 sec)
以上就是我们如何将 mysql sum() 函数与 having 子句一起使用？的详细内容。