Hello, I am trying to figure out the best way to query duplicate rows for the same product on an invoice. For example, let's say I have an invoice # 001 that has product x with 2 units and product x again with 10 units. So I want to return all the invoices that have the same product twice. I do not want the query to return invoices where we may have product x and product y. Thanks!
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try this
Select InvoiceNo, productCD, count(1) from
group by InvoiceNo, productCD
having count(1)>1

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Hi , try this :

create table #invoice(id int,total money)
create table #details(id int,idproduct int,counts int)

insert into #invoice values(1,100)
insert into #invoice values(2,100)

insert into #details values(1,100,2)
insert into #details values(1,100,10)

insert into #details values(2,100,3)

select i.id,i.total,d.idproduct
from #invoice i inner join
      #details d on i.id = d.id
group by i.id,i.total,d.idproduct
having count(d.idproduct)> 1

In this query, you will have all invoices that have same product on same invoice twice or more times.

Hope this help!
I think it goes like this:

Select * from InvoiceTable i
where exists
(select 1 from InvoiceProductTable p where p.InvoiceFK=i.InvoicePK
   group by p.ProductFK
   having count(*) > 1

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Microsoft SQL Server 2005

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