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我们如何在HAVING子句中使用MySQL SUM()函数？

2024-04-29 13:29:04 302

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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我们如何在HAVING子句中使用MySQL SUM()函数？

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