Let R(A, B, C, D) be a relation with FDs F= {A->B, A->C, C->A, B->C, ABC->D}...

Question

Question

Let R(A, B, C, D) be a relation with FDs F= {A->B, A->C, C->A, B->C, ABC->D} which of the statement is correct?

Question 2 Not yet answered Marked out of 2.00 P Flag question Let R(A,B,C,D) be a relation with FDs F = {AL-B, AC, CA, B-C,

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Answer 1

Answer #1

R(A,B,C,D)
F={
A->B
A->C
C->A
B->C
ABC->D
}

Here A->B And A->C is replaced with A->BC

New Set= A->BC
C->A
B->C
ABC->D

Now C is extraneous attribute in A->BC. Therefore it is replace with A->B

New Set= A->B
C->A
B->C
ABC->D

Here B is extraneous attribute in ABC->D. Therefore it is replace with AC->D

New Set= A->B
B->C
C->A
AC->D

Answer:- G={A->B , B->C, C->A, AC->D } is a Canonical cover of F.

Answer 2

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