Question

What is the maximum number of super keys for the relation r1(p,q,r,s) with r as the key?

Answer 1

Answer:

A functional dependency (FD) is a relationship between two attributes, ... For any relation R, attribute Y is functionally dependent on attribute X (usually the PK), ... The left side of the above FD diagram is called the determinant, and the right side is the dependent. ... From our understanding of primary keys, A is a primary key.

Answer 2

Answer:

8

Explanation:

Maximum no. of possible superkeys for a table with n attributes = 2^(n-1)

Here, n = 4.

So, the possible superkeys = 2^(4-1) =8