Which of the following specifies that each entity instance of the supertype must be a member of some subtype in the relationship?
A)total specialization rule
B)partial specialization rule
C)disjoint rule
D)overlap rule

Question

Quizplus · Accepted Answer

The total specialization rule specifies that each entity instance of the supertype must be a member of some subtype in the relationship, whereas the partial specialization rule allows for entity instances of the supertype to exist without belonging to any subtype. The disjoint/overlap rules specify the relationship between subtypes and whether they can overlap or not.

Which of the Following Specifies That Each Entity Instance of the Supertype