In your query, give the column a name. You can't use the field name but you can just say this:
For example if you have a field named OrderTotal you would get SumOfOrderTotal if it was an aggregate using the sum. To get around that in your query do -
Order Total:OrderTotal
Notice that I gave the name Order Total with a space, but the field name was without a space. I could have done this too
My Order Total:OrderTotal