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GATE | GATE CS 2018 | Question 59
Consider the relations r(A, B) and s(B, C), where s.B is a primary key and r.B is a foreign key referencing s.B. Consider the query
Q: r⋈(σB<5(s))
Let LOJ denote the natural left outer-join operation. Assume that r and s contain no null values.
Which one of the following is NOT equivalent to Q?
(A)
σB<5(r ⋈ s)
(B)
σB<5(r LOJ s)
(C)
r LOJ (σB<5(s))
(D)
σB<5(r)LOJ s
Answer
Please comment below if you find anything wrong in the above post
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