An easy way to get started is to formulate in plain language a statement or a question that you want the data to answer. The more detail you add to the statement or question, the more precisely you will be able to define your query.
Suppose you want to hold a special luncheon for families who were top contributors to the Air Conditioning fund. You are defining "top contributors" as those who gave more than $100 to the fund. You need to know the names and addresses of these individuals so that you can send the luncheon invitations directly to the givers' homes.
Our question is as follows: