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Question 7942 – Relational-Algebra
May 3, 2024
Question 6745 – Relational-Algebra
May 3, 2024
Question 7942 – Relational-Algebra
May 3, 2024
Question 6745 – Relational-Algebra
May 3, 2024

Question 1318 – Relational-Algebra

Consider the schema R = (A, B, C, D, E, F) on which the following functional dependencies hold :

A ➝ B B, C ➝ D E ➝ C D ➝ A

What are the candidate keys of R ?

Correct Answer: A

Question 42 Explanation: 
EFA+ = {EFABCD}
EFB+ = {EFABCD}
EFC+ = {EFC}
EFD+ = {EFDCAB}
So, EFA, EFB, EFD are the keys for the given relation R = (A, B, C, D, E, F).
A
AEF, BEF and DEF
B
AEF, BEF and BCF
C
AE and BE
D
AE, BE and DE
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