Question

Question 9 Not yet answered Marked out of 2.00 P Flag question Consider the set of FDs F = {CF-A, AF-CF, AC-F, EF-D, C-EF, D4B, AE--F}. Which of the following FDs does not follow from F? (2 Põints) Select one: CE-B AC-B CF-B AFGB All of the above None of the above

Answer 1

Correct Answer: None of the above

Explanation:

Functional Dependency:

It is a relationship between two attributes in which the right-hand side attribute is functionally dependent on the left-hand side attribute.

If the value of attribute Y is determined by the value of X then it is represented as given below:

X → Y

The FD given in the first option does follow by using the below FDs:

C-EF,

EF-D

DB,

The FD given in the second option does follow by using the below FDs:

AC-F

EF-D

DB,

The FD given in the third option does follow by using the below FDs:

C-EF,

EF-D

DB,

The FD given in the fourth option does follow by using the below FDs:

AF-CF

C-EF,

EF-D

DB,

All option does follow from F.

So, last option is the correct option.