SQL Server查询减法

Question

I have a Ledger table see the image

I want to write a query which will subtract DR-CR data.. and requrn only due amount data.

its should omitted the paid amount 5000 because we have 2000 on 1-3-2014 and 3000 on 1-4-2014

can you please help... I have done this on application . But I want to do this on my sql query.

Answer 1

SQL Server 2008 doesn't have a cumulative sum. So, you have to use more complicated expressions. The idea is to take the cumulative amount of DR, then subtract the sum of the credit, and choose the rows where the value is positive.

select l.*
from (select l.*,
             (select sum(dr)
              from ledger l2
              where l2.id <= l.id
             ) as cumdr,
             sum(cr) over () as sumcr
      from ledger l
     ) l
where cumdr - sumcr > 0;