Activity 1 Represent the following,
using the constructs of the Entity Relationship model.
1. In a zoological garden there are animals belonging to a species and
having a certain age, each species is situated in a sector (having a name)
of the zoo.
2. An automobile rental firm has a vehicle pool, in which each automobile
has a registration number and a colour and belongs to one category; for
each category, there is a rental tariff,
3. A company produces CDs with a code and a title, each cd has been
recorded by one or more singers, each of whom has a name and an
address and some of whom have a stage name.