Question

我从查询中得到了这个结果集：

OrderId CustomerId  ProducerId  CustomerPayment ProducerPayment
1       1           3           10              5
1       1           4           10              5
1       2           3           10              5
1       2           4           10              5

我需要将此结果返回到：

OrderId UserId  Payment
1       1       20
1       2       20
1       3       10
1       4       10

只需将CustomerId和ProducerId合并到UserId即可。与Payment列相同。

使用简单的select和group by有没有办法实现这一目标？我避免使用temp tables，调用多个相同的queries并进行优化。我希望这是可能的。

非常感谢

Answer 1

SELECT 
OrderId,
CustomerID AS UserId,
SUM (CustomerPayment) As Payment
FROM orders
UNION ALL
SELECT 
OrderId,
ProducerId AS UserId,
SUM (ProducerPayment) As Payment
FROM orders

Answer 2

尝试这样的事情：

select
    OrderId,
    CustomerId,
    sum(CustomerPayment) Payment,
    group_concat(OrderId separator ',') listOrders /* list all OrderID's from the user and separates these with a , */
from your_table
group by CustomerId

不知道你的查询看起来像atm？

MySql结果集合并列

2 个答案: