Design a database for a world-wide package delivery company (e.g., DHL or FedEX). The database must be able to keep track of customers (who ship

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Design a database for a world-wide 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.