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GATE | Sudo GATE 2020 Mock II (10 January 2019) | Question 36
Consider the following collection of relation schemes:
professor(profname, deptname) department(deptname, building) committee(profname,commname)Find all the professors who are in exactly (i.e., no more and no less) all those committees that Professor Smith is in.
(A)
R2 <- Πcommname(Πprofname(committee)) R3 <- Πcommname(committee) - R2 (committee / R2) - σprofname = Smith(committee ⋈ R3)
(B)
R2 <- Πcommname(Πcommname(committee)) R3 <- σprofname = Smith(committee) - R2 (committee / R2) - Πprofname(committee ⋈ R3)
(C)
R2 <- Πcommname(σprofname = Smith(committee)) R3 <- Πcommname(committee) - R2 (committee / R2) - Πprofname(committee ⋈ R3)
(D)
None of the above.
Answer
Please comment below if you find anything wrong in the above post
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