Q. 40 Let R and S be two relations with the following schema
R (P,Q,R1,R2,R3) S (P,Q,S1,S2)
Where {P, Q} is the key for both schemas. Which of the following queries are equivalent?
(A) Only I and II
(B) Only I and II
(C) Only I, II and III
(D) Only I, II and IV
Answer: (D)
Explanation:
