Question

I have

items  ---- supporders ---- suppincoming 
=====       ==========      ============
ItemID      OrderID         OrderID
            ItemID          IncQty
            OrderQty
            SODate

and

items  ---- orderrows ---- orders
=====       =========      ======
ItemID      ItemID         OrderID
            OrderID        OrderDate
            ORQty

and want to sum ORQty, OrderQty and IncQty per item.

If I join all tables, the two “branches” from item produce a kind of cross-join and the amount goes up the roof.

Subqueries gives correct values, but awfully slow.

EDIT:
Please see link for MS-access runnable example.

Any better way?

regards,
/t

Answer 1

It seems the query can’t be issued without subqueries, and obviously, MS-access with linked tables to sql-server (firebird) is a performance-pig.

Executing a parameterized pass-through query from Access solves the performance issues.

thanks
/t