Question

我的数据存储在mysql中。

我的表格数据如下

3   credit  500.00
3   debit   500.00
4   credit  300.00
4   debit   300.00
5   credit  300.00
5   debit   300.00
6   credit  300.00
6   debit   300.00

我想写一个查询来写数据客户ID，信用卡，借记卡，final_amount

最终金额= credit-debit

有人可以帮我查询吗？

Answer 1

您可以使用条件聚合：

select customerid, 
       sum(case when type = 'credit' then amount else 0 end) as credit,
       sum(case when type = 'debit' then amount else 0 end) as debit,
       sum(case when type = 'credit' then amount
                when type = 'debit' then - amount
                else 0
           end) as credit
from t
group by customerid;

在其他字段

1 个答案: