A subtype discriminator is which of the following?
A. An attribute of the supertype whose values determine the subtype
B. An attribute of the subtype whose values determine the supertype
C. An attribute of the supertype whose values determine the supertype
D. An attribute of the subtype whose values determine the subtype
Answer: Option A
This Question Belongs to Database >> ER Model And Business Rules
An action assertion must include which of the following?
A. Anchor object
B. Action
C. Corresponding object
D. All of the above
An oval represents which of the following in an EER?
A. Attribute
B. Entity
C. Optional One
D. Relationship
Inheritance is which of the following?
A. When a supertype entity inherits values of the subtype attribute
B. When a subtype entity inherits values of the supertype attribute
C. When a supertype entity inherits values of another supertype attribute
D. When a subtype entity inherits values of another subtype attribute
When an entity instance must be a member of only one subtype, it is which of the following?
A. Disjoint with total specialization
B. Disjoint with partial specialization
C. Overlap with total specialization
D. Overlap with partial specialization
Join The Discussion