Heterogeneous Data Problems
Rental Program Version 1
Heterogeneous databases include derived tables from a base table to reflect inheritance hierachies in the class structure of a program. A rental company may have an application with the following class hierarchy:
Tables in a Heterogeneous Database
The Customer table is standard.
The Rental table is the master table for all rental entries. Customer id is foreign key. Type is a field to designate rental type: 0 = apartment, 1 = office
The Apartment table contains apartment information.
The Office table contains office information.
Note: the rental programs also rely on smart pointers defined as
typedef definitions in Rental.h.