Q2.25

MCQ2 marks, −0.5

Given relations r(w, x) and s(y, z) the result of select distinct w, x from r, s is guaranteed to be same as r, provided.

(A)

r has no duplicates and s is non-empty

(B)

r and s have no duplicates

(C)

s has no duplicates and r is non-empty

(D)

r and s have the same number of tuples

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