Multiple Choice
The "____" characteristic of a primary key states that:
The PK must uniquely identify each entity instance.A primary key must be able to guarantee unique values.It cannot contain nulls.
A) unique values
B) nonintelligent
C) preferably single-attribute
D) security complaint
Correct Answer:
Verified
Correct Answer:
Verified
Q2: Overlapping subtypes are subtypes that contain a
Q9: The default comparison condition for the subtype
Q16: The extended entity relationship model (EERM)is sometimes
Q21: An entity cluster is formed by combining
Q22: _ completeness means that not every supertype
Q29: Disjoint subtypes are subtypes that contain nonunique
Q36: Within a specialization hierarchy, every subtype can
Q42: _ is the bottom-up process of identifying
Q53: The most common design trap is known
Q67: In what two cases are composite primary