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GATE | GATE-CS-2000 | Question 49

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


r has no duplicates and s is non-empty


r and s have no duplicates


s has no duplicates and r is non-empty


r and s have the same number of tuples


Please comment below if you find anything wrong in the above post
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