I'm trying to create a basic inventory tracking database for multiple products. I have a table of products, purchases, and sales. The common field is ProductName, which is my primary key in products. I managed to make 2 seperate queries totaling the purchases and sales by product. What I need is a table combining the two and subtracting sales from purchases to give me the total inventory of each product. I know this isn't too difficult but I haven't messed with Access in 5 years or so and am coming up blank. Thanks for any help anyone can give me.