Suppose you work in IT, and the sales team needs answers to three specific questions. The data might be stored physically in seven tables. You know how to create Microsoft Access queries, but to learn more about database logic and design, you decide to study Figure 9-16, and then pretend to tell the database how to find the answers, step by step:

a. Did any customers receive service after 5/4/2015? If so who were they?

b. Did technician Marie Johnson put in more than six hours of labor on any service calls? If so, which ones?

c. Were any parts used on service calls in Washington? If so, what were the part numbers, descriptions, and quantities?