Design a database for a worldwide package delivery company (e.g., DHL or FedEx). The database must be able to keep track of customers who ship items and customers who receive items; some customers may...

Design a database for a worldwide package delivery company (e.g., DHL or

FedEx). The database must be able to keep track of customers who ship items

and customers who receive items; some customers may do both. Each package

must be identifiable and trackable, so the database must be able to store the

location of the package and its history of locations. Locations include trucks,

planes, airports, and warehouses.

Your design should include an E-R diagram, a set of relational schemas, and

a list of constraints, including primary-key and foreign-key constraints.