GATE | GATE-CS-2014-(Set-2) | Question 65

SQL allows tuples in relations, and correspondingly defines the multiplicity of tuples in the result of joins. Which one of the following queries always gives the same answer as the nested query shown below:

    select * from R where a in (select S.a from S)

(A)

select R.* from R, S where R.a=S.a (D)

(B)

select distinct R.* from R,S where R.a=S.a

(C)

select R.* from R,(select distinct a from S) as S1 where R.a=S1.a

(D)

select R.* from R,S where R.a=S.a and is unique R

Answer

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