Question

我正在尝试查找表格中列出的每种付款方式的总金额。我有每行的总和，现在我需要添加这些总和。查询是：

select payment_method, (deposit + pet_deposit + cleaning_fee + rental_rate) as            
total
from reservations
group by total
order by payment_method;

这是结果集：

+----------------+---------+
| payment_method | total   |
+----------------+---------+
| Check          |  760.00 |
| Check          |  960.00 |
| Check          |  660.00 |
| MasterCard     |  600.00 |
| MasterCard     | 1160.00 |
| PayPal         |  500.00 |
| Visa           |  560.00 |
| Visa           |  610.00 |
| Visa           |  700.00 |
+----------------+---------+
9 rows in set (0.00 sec)

我如何才能实现，因此每种付款方式只有一个实例，而且总列数是全部？

Answer 1

只需GROUP BY付款方式，如下所示：

SELECT payment_method, 
     SUM(deposit + pet_deposit + cleaning_fee + rental_rate) 
          AS total
FROM reservations
GROUP BY payment_method
ORDER BY payment_method;

您的结果应如下所示（总和中的样本数据）：

+----------------+---------+
| payment_method | total   |
+----------------+---------+
| Check          |  123.45 |
| MasterCard     |  234.56 |
| PayPal         |  345.67 |
| Visa           |  456.78 |
+----------------+---------+

Answer 2

按付款方式分组而非总计。

如何在mysql中添加多个总计？

2 个答案: