从单个表中查询SQL

Question

我有一个包含字段Document Type的表格。我希望那些Customer的{​​{1}} Sum(Amount) Document Type 4 - Sum(Amount) Document type 6＆gt; 0然后应显示其Customer Document Type (4,6)的那些记录。

Answer 1

让我们假设您的表名是TableA，而Customer列名是CustomerID。

我们可以通过下面的SQL逻辑来实现这个要求。

   select x.* from TableA x

    join 

    (select * from 
    (select dt4.customerID, sum_amount_dt4-sum_amount_dt6 as dt4minusdt6
    from 
    (select CustomerID,sum(Amount) as sum_amount_dt4 from TableA a
    where a.Docutype=4)dt4
    join
    (select CustomerID,sum(Amount) as sum_amount_dt6 from TableA a
    where a.Docutype=6)dt6
    on dt4.customerID=dt6.customerID
    )dt46
    where dt46.dt4minusdt6>0 ) y

on x.customerID=y.customerID