[AccessD] Query synatx

> I have a OrderHeader and OrderDetails tables. 
> The OrderHeader contains a InvoiceType field, set to True for Invoice
> and False for CreditNotes.

In other words Invoice Header = -1 for Invoice and 0 for CreditNotes

> The OrderDetails contains a Quantity field. This is always a positive
> value, even for CreditNotes.
> The join between the tables is on OrderID.
> 
> What I am trying to do is create a query that will return a single value
> for all the quantities on order in the OrderDetails, for a given product
> number. So where the InvoiceType = False, the Quantity will have to be
> Quantity * -1.
> 

- (Quantity * InvoiceType)



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