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Question 10427 – Deadlock
February 29, 2024
Question 14220 – Probability-and-statistics
February 29, 2024
Question 10427 – Deadlock
February 29, 2024
Question 14220 – Probability-and-statistics
February 29, 2024

Question 11589 – Functional-Dependency

Let R = (A, B, C, D, E, F) be a relation schema with the following dependencies:

C → F,E → A, EC → D, A → B 

Which of the following is a key for R?

Correct Answer: B

Question 18 Explanation: 
Let’s find closure of each options,
(CD)+ = CDF X
(EC)+ = ECFDAB ✓
(AE)+ = AEB X
(AC)+ = ACBF X

A
CD
B
EC
C
AE
D
AC
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