Doing division from data in one field against data in another fi

Another basic question from an access novice. I am trying to do division calculations on access with lots of data, I know it will be easier to do this on excel but I want access to be able to perform the function as part of a query for the data base I am trying to build. What is the SQL code for instructing access to divide data in one field against data in another field and present the results of each division in a separate field? Thanks.