Question

我正在画一个空白，我的查询完美无缺，但现在我只想返回

TotalCredits - TotalDebits as Difference

下面是产生我需要减去的两个值的查询，我用连接玩了但是我觉得我偏离了轨道。

select
(select sum(TOTALAMOUNT) from journal where memberid=48 and CREDIT =1) as TotalCredits,
(select SUM(totalamount) from Journal where MEMBERID=48 and DEBIT =1) As TotalDebits

Answer 1

尝试这样的事情

SELECT 
    SUM(CASE WHEN CREDIT = 1 THEN TOTALAMOUNT END) as TotalCredits,
    SUM(CASE WHEN DEBIT = 1 THEN TOTALAMOUNT END) as TotalDebits,
    SUM(CASE WHEN CREDIT = 1 THEN TOTALAMOUNT END) - SUM(CASE WHEN DEBIT = 1 THEN TOTALAMOUNT END) as Diff
FROM journal 
WHERE memberid=48

Answer 2

将您的查询放入这样的派生表中;

select TotalCredits - TotalDebits as Difference
from 
(
select
(select sum(TOTALAMOUNT) from journal where memberid=48 and CREDIT =1) as TotalCredits,
(select SUM(totalamount) from Journal where MEMBERID=48 and DEBIT =1) As TotalDebits
) temp

在SQL中减去两列

2 个答案: