SQL Server : SUM DISTINCT GROUP BY - sql

Question

I'm currently creating a query to sum the code below
select distinct
opch.docentry as 'AP Invoice #',
pch1.linenum as 'AP Invoice Line #',
pch1.itemcode as 'Item Code',
pch1.dscription as 'Item Name',
pch1.freetxt as 'Free Text',
pch1.priceafvat as 'Gross Price',
pch1.quantity as 'Quantity',
pch1.gtotal as 'Gross Total'
from
opch
inner join
pch1 on opch.docentry = pch1.docentry
inner join
opdn on opdn.docentry = pch1.basedocnum
inner join
pdn1 on opdn.docentry = pdn1.docentry
inner join
opor on opor.docentry = pdn1.basedocnum
inner join
por1 on opor.docentry = por1.docentry
where
pch1.u_budgetno = '57'
and opch.canceled = 'N'
and opdn.docstatus = 'C'
and opdn.canceled = 'N'
and opor.docstatus = 'C'
and opor.canceled = 'N'
order by
opch.docentry
This is the sum statement I've tried
select
opch.docentry,
sum(pch1.gtotal)
from
opch
inner join
pch1 on opch.docentry = pch1.docentry
inner join
opdn on opdn.docentry = pch1.basedocnum
inner join
pdn1 on opdn.docentry = pdn1.docentry
inner join
opor on opor.docentry = pdn1.basedocnum
inner join
por1 on opor.docentry = por1.docentry
where
pch1.u_budgetno = '57'
and opch.canceled = 'N'
and opdn.docstatus = 'C'
and opdn.canceled = 'N'
and opor.docstatus = 'C'
and opor.canceled = 'N'
group by
opch.docentry, opdn.docstatus
It however doesn't return the correct amount as it duplicates some answers based on the connected tables.
Requesting assistance on what I'm doing wrong.
*Update
This is the result from the select distinct query
enter image description here
I'm aiming for the sum query to sum the results from the pch1.gtotal column
Thank you.

Answer 1

The problem is in the join you are doing between the invoice and the delivery note. You are not joining the line so it multiplies the results. The correct join is done using BaseEntry, BaseLine and BaseType. The same applies to the join with the purchase order.
select
opch.docentry,
sum(pch1.gtotal)
from
opch
inner join
pch1 on opch.docentry = pch1.docentry
inner join
pdn1 on pdn1.docentry = pch1.baseentry and pdn1.linenum = pch1.baseline and pdn1.objtype = pch1.basetype
inner join
opdn on opdn.docentry = pdn1.docentry
inner join
por1 on por1.docentry = pdn1.baseentry and por1.linenum = pdn1.baseline and por1.objtype = pdn1.basetype
inner join
opor on opor.docentry = por1.docentry
where
pch1.u_budgetno = '57'
and opch.canceled = 'N'
and opdn.docstatus = 'C'
and opdn.canceled = 'N'
and opor.docstatus = 'C'
and opor.canceled = 'N'
group by
opch.docentry