Stored Procedure Checking 2 Tables

ok, ill lay it out like this, and try not to be too confusing.

I need to check my trasaction table to see that the user with a UserID bought, keeping track(adding up) of how many times they bought the Product with a productID, , then i need to selcect items from product table with the productID for the items the user bought,


i know how to return the product information, and how to check the tranaction table and i think how to add up the amount of tranastions for that item


so bacially i need to select data from a product table, for the products that the user bought tahts stored in the transaction table.

well i tried not to be confusing, but i think i failed