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SQL Update structure

Hello every one,

I asked a question earlier and now I'm refining it to make it clearer (Because I'm now getting to understand my problem).

I have a table "Products" and an attribute "Quantity". I also have a subform in the Invoice from and the subform is created using a query "Invoice_line_quiry". There is in this query "Invoice_line_quiry" an attribute "Quantity" taken from the bridge entity "Invoice_Line" between the tables "Products" & "Invoice".

My problem is that I don't know how to write in SQL a code that subtratcts the sold quantity in the subform from the qauntity in the table "Products".

Note: My knowledge in SQL is pretty basic but I understand the code in general, it is the directory of each attribute in a query or a table is the thing that troubles me.

Thank's again for all the help.

Paolo.
May 6 '06 #1
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