computition与空的MS Access

2011-04-08 49 views 0 likes

我的表名在MS接取场AE ID，交易，金额CAPCON，computition与空的MS Access

我的查询是

Select distinct(CapCon.ID), 
(Select sum(amount) from CapCon as c 
    where c.id=CapCon.id 
    and transaction='Deposite') - 
(Select sum(amount) from CapCon as c 
    where c.id=CapCon.id and transaction='Withdrawal') 
as [Capital Contribution] from CapCOn

中频没有取款的交易，没有在[出资]输出相应的ID

来源

2011-04-08 Ryan

嘿，Ryan，仅供将来参考，您可以通过缩进4个空格或在其周围添加反斜杠来格式化代码。您提出的问题越容易阅读，您就越有可能得到答案。 :) – 2011-04-08 01:32:21

回答

您需要在WHERE子句中检查null：

Select distinct(CapCon.ID), 
    (Select sum(amount) from CapCon as c 
    where c.id=CapCon.id 
    and transaction='Deposite') - 
    (Select sum(amount) from CapCon as c 
    where c.id=CapCon.id 
    and transaction='Withdrawal' 
    and transaction is not null) 
as [Capital Contribution] from CapCOn

来源

2011-04-08 01:31:57

请在回答时花时间格式化代码。 – 2011-04-08 01:35:18

computition与空的MS Access

回答

相关问题