请咨询如何在SQL中对数据进行分组

Question

示例表

Cust_no | Item_no | Discount_Amt |Discount_%|
A123    | ITEM123 |          0.1 |          |
AB321   | ITEM123 |           50 |          |
A123    | ITEM123 |              |       3  |
CD343   | ITEM345 |              |       2  |

和我想要的结果：

Cust_no | Item_no | Discount Amt| Discount_%|
A123    | ITEM123 |       0.1   |     3     |
AB321   | ITEM123 |       50    |    0      |
CD343   | ITEM345 |             |    2      |

如何在SQL中获得该结果？

Answer 1

试试这个：

SELECT Cust_no,Item_no,SUM(Discount_Amt),SUM(Discount_%)
FROM TableName
GROUP BY Cust_no,Item_no

Answer 2

我认为你正在寻找与此类似的东西

SELECT Cust_no,Item_no, MAX(Discount_Amt),MAX(Discount_%) 
FROM Table 
GROUP BY Cust_no, Item_no