如何基于第三列中的谷值获得两列之和并以第四列分组？

Question

我有一个MySQL表，其中表有四列状态，即Dr_amount，Cr_amount，Type，我想知道每个状态的Dr_amount和Cr_amount的总和，其中有两个不同的条件，其中type = in和type = out

我尝试使用以下代码，但正在计算列的每个条目

select *,(select sum(Credit_Rs) from expense where type = 'Received') as crsum,(select sum(Debit_Rs) from expense where type = 'Expense') as drsum from expense group by state order by state

下面是带有示例条目的表格

Month   Debit (Rs) Credit (Rs) Type
Bihar               150000     IN    
Bihar   50000        50000     OUT   
Bihar   15000        10000     OUT   
UP      0           100000     IN

我想要这样的结果

Month   Debit (Rs) Credit (Rs) 
Bihar   65000      150000        
UP      0          100000

Answer 1

您可以尝试使用case when expression

select state,sum(Debit_Rs),sum(case when Type='IN' then Credit_Rs end)
from tablename
group by state
order by state