Q. 63 Consider the following relation P(X, Y, Z), Q(X, Y, T) and R(Y, V):
How many tuples will be returned by the following relational algebra query?
πx(σ(P.Y = R.Y ∧ R.V = V(P X R))) - πx(σ(Q.Y = R.Y ∧ Q.T > 2(Q X R)))
Note: This was Numerical Type question.
(A) 3
(B) 1
(C) 2
(D) 4
Answer: (B)
Explanation:
