Question

What is an entity supertype, and why is it used?

Answer 1

Answer:

Correct answer is option B (The reason for using supertypes is to minimize the number of nulls and to minimize the likelihood of redundant relationships)

Explanation:

Entity supertype

A  entity supertype is a generic entity type which is related with one or more subtypes.

Use of entity supertype:

The reason for using entity supertype is to reduce redundant relationships and it is also used to minimize the number of nulls.