Consider a mail order database in which employees take orders for parts from customers.

The data requirements are summarized as follows:

• The mail order company has employees identified by a unique employee number, their first and last names, and a zip code where they are located.
• Customers of the company are uniquely identified by a customer number. In addition, their first and last names and a zip code where they are located are recorded.
• The parts being sold by the company are identified by a unique part number. In addirion, a part name, their price, and quantity in stock are recorded.
• Orders placed by customers are taken by employees and are given a unique order number. Each order may contain certain quantities of one or more parts and their received date as well as a shipped date is recorded. Design an Entity-Relationship diagram for the mail order database.