What is a disjoint less constraint?
A. It requires that an entity belongs to no more than one level entity set.
B. The same entity may belong to more than one level.
C. The database must contain an unmatched foreign key value.
D. An entity can be joined with another entity in the same level entity set.
Answer:A
What is a disjoint less constraint?
A. It requires that an entity belongs to no more than one level entity set. B. The same entity may belong to more than one level. C. The database must contain an unmatched foreign key value. D. An entity can be joined with another entity in the same level entity set.
Explanation: Disjoint less constraint requires that an entity belongs to no more than one level entity set. (Disjoint less constraint means that an entity can be a member of at most one of the subclasses of the specialization.)