[英]How to use column from main query in subquery?
我有一个表总帐的发票。 然后我有一个表格付款与列数量(通常有几个付款到一张发票)。 我需要一个列余额,这是Invoice.Total的差异 - (在该发票上支付的总额)。 这就是我所拥有的(哦,你使用Azure Sql Server)
select I.Invoice_Id,
I.Total - (select sum(Amount) from Payments P
where I.Invoice_Id = P.Invoice_Id) as Balance,
Q.Quote_Id,
Q.Description,
Q.Vendor_Num
from Invoice as I
inner join Payments as P on I.Invoice_Id = P.Invoice_Id
inner join Quote as Q on Q.Quote_Id = I.Quote_Id;
最终,这将是一个视图,显示发票的余额。 如果我删除子查询中的where,它会给我一个答案,但它是所有付款的总和。 我只想要在该发票上支付的款项。 任何帮助,将不胜感激。
谢谢
我怀疑您的查询返回多个结果(每次付款重复),因为您要joining
payments
表。
一种选择是将该join
删除到payments
表。 这是一个替代选项,它将correlated subquery
移动到join
:
select I.Invoice_Id,
I.Total - p.SumAmount as Balance,
Q.Quote_Id,
Q.Description,
Q.Vendor_Num
from Invoice as I
inner join Quote as Q on Q.Quote_Id = I.Quote_Id;
inner join (
select invoice_id, sum(amount) SumAmount
from Payments
group by invoice_id) as P on I.Invoice_Id = P.Invoice_Id
这有两种方法。 您可以子查询或分组。 如果您正在执行子查询,则不需要主查询中的表。 此外,付款的内部联接意味着查询不会返回未付款的发票。 如果I.Invoice_Id = P.Invoice_Id
, I.Invoice_Id = P.Invoice_Id
其更改为Group By示例中的左外连接将返回NULL行。
通过...分组:
SELECT I.Invoice_Id,
I.Total - sum(ISNULL(P.Amount,0)) AS Balance,
Q.Quote_Id,
Q.Description,
Q.Vendor_Num
FROM Invoice AS I
JOIN Quote AS Q on Q.Quote_Id = I.Quote_Id
LEFT JOIN Payments AS P on I.Invoice_Id = P.Invoice_Id
GROUP BY I.Invoice_Id, I.Total, Q.Quote_Id, Q.Description, Q.Vendor_Num
子查询:
SELECT I.Invoice_Id,
I.Total - (SELECT ISNULL(SUM(Amount),0) FROM Payments P WHERE P.Invoice_Id = I.Invoice_Id) AS Balance,
Q.Quote_Id,
Q.Description,
Q.Vendor_Num
FROM Invoice AS I
JOIN Quote AS Q on Q.Quote_Id = I.Quote_Id
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