- What is a subclass? When is a subclass needed in data modeling?
- Define the following terms: superclass of a subclass, superclass/subclass relationship,
is-a relationship, specialization, generalization, category, specific (local) attributes) specific
relationships. 3. Discuss the mechanism of attribute/relationship inheritance. Why is it useful?
- Discuss user-defined and predicate-defined subclasses, and identify the differences
between the two.