The New-Car Order

You are designing a computer system for a car dealer. The dealer takes orders for cars from a customer. Your job is to design the data for an order.

Here is the information in an order:

1. An order includes the customer.
2. An order includes the information for the car being ordered.
3. An order includes the price.
4. An order includes the date of the order.
5. A customer has a last name, a first name, and an address.
6. An address has many fields, which we won't talk about here.
7. The car may either be a new car or a used car.
8. A used-car order includes the previous owner, who is another customer.
9. A new car may be either 2-door or 4-door.
10. A new car has an engine, which may have 4, 6, or 8 cylinders.
11. A new car may or may not have a sunroof.
12. A new car has an interior color.
13. A new car has an exterior color.

Write data definitions for Order, Customer, and Car. Your data must interact with some large existing system, so make as few assumptions about the data representation as possible.