我们如何在HAVING子句中使用MySQL SUM()函数?
通过将MySQLSUM()
函数与HAVING子句一起使用,它将根据在HAVING子句之后给出的特定条件过滤结果。为了理解上述概念,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,下面的查询将使用带有SUM()
函数的HAVING子句来获取超过250个的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)
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