1) 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 III
(C) Only I, II and III
(D) Only I, III and IV
Answer: (D)
Explanation: See Question 1 of https://www.geeksforgeeks.org/database-management-systems-set-7/
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