Interbase SQL Grouping and displaying

Question

I have a database with different data I need to make a query to select a group with summed quantities.

Two tables: Positions and Documents.

There can be many positions in one document both are connected by unique_id.

The Documents have two different statuses: In and Out

I need to see the result of these two status on one row with a column for each case, but instead my query gives me two rows. How do I do it?

My query doesn't give me this result:

Select   documents.code
        ,positions.fullname
        ,case when documents.status='In' then Sum(positions.quantity) else 0 end as DocIn
        ,case when documents.status='Out' then Sum(positions.quantity) else 0 end as DocOut
from positions
    inner join documents
        on documents.unique_id=positions.unique_id
group by documents.code, positions.fullname, documents.status

Answer 1

You are getting two rows per document because you are grouping by documents.status. You need to use SUM() slightly differently and then remove documents.status from the GROUP BY clause:

Select   documents.code
        ,positions.fullname
        ,SUM(case when documents.status='In' THEN positions.quantity ELSE 0 END) AS DocIn
        ,SUM(case when documents.status='Out' THEN positions.quantity ELSE 0 END) AS DocOut
from positions 
inner join documents
 on documents.unique_id=positions.unique_id 
 group by documents.code, positions.fullname