Question

If each higher level entity belongs to the lower level entity, then what kind of generalization is it?

(a) Modal generalization

(b) Partial generalization

(c) Total generalization

(d) None of the mentioned

The question was asked in final exam.

Question is taken from Extended E-R Features in chapter Database Design and the ER Model of RDBMS

Answer 1

Correct answer is (c) Total generalization

Easy explanation: If each higher level entity belongs to the lower level entity then it is called as total generalization. It is also called as total specialization. If some higher level entities do not belong, it is called as partial generalization.