我們如何將 MySQL SUM() 函數與 HAVING 子句一起使用？

透過將 MySQL SUM() 函數與 HAVING 子句結合使用，它會根據 HAVING 子句後給出的特定條件過濾結果。要理解上述概念，請考慮一個「employee_tbl」表，該表具有以下記錄 -

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)

現在，下面的查詢將使用 HAVING 子句和 SUM() 函數來獲取超過 250 的 daily_typing_pages 總數。

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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