Question

If K → R then K is said to be the _______ of R

(a) Candidate key

(b) Foreign key

(c) Super key

(d) Domain

I had been asked this question in unit test.

This question is from Decomposition Using Functional Dependencies in section Relational Database Design of RDBMS

Answer 1

The correct choice is (c) Super key

For explanation I would say: If K →  R then k is said to be the superkey of R i.e. K uniquely identifies every tuple in the relation R.