Calculate value from two field in third field

Posted by terence6 on Stack Overflow See other posts from Stack Overflow or by terence6
Published on 2010-06-09T15:39:20Z Indexed on 2010/06/09 15:42 UTC
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ms-access

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queries

I'm trying to create a query, that will calculate sum of products on invoice. I have 3 tables :

Product (with product's price)
Invoice (with invoice id)
Products on invoice (with invoice id, product id and number of particular products)

So in my query I take invoice_id (from invoice), price (from product),number of products sold and invoice_id (from products on invoice) and calculate their product in fourth column. I know I sohuld use 'Totals' but how to achieve that ?

Model:
alt text

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