At least the first one please Thank you For each of the foll

For each of the following relation schemas and set of FD\'s: R(A, B, C, D) with FD\'s AB rightarrow C, C rightarrow D, and D rightarrow A R(A, B, C, D) with FD\'s B rightarrow C and B rightarrow D R(A, B, C, D) with FD\'s AB rightarrow C, BC rightarrow D, CD rightarrow A and AD rightarrow B R(A, B, C, D) with FD\'s A rightarrow B, B rightarrow C, C rightarrow D and D rightarrow A R(A, B, C, D, E) with FD\'s AB rightarrow C, DE rightarrow C, and B rightarrow D R(A, B, C, D, E) with FD\'s AB rightarrow C, C D, D rightarrow B, and D rightarrow E Do the following: Indicate all the BCNF violations. Do not forget to consider FD\'s that are not in the given set, but follow from them. However, it is not necessary to give violations that have more than one attribute on the right side? Decompose the relations, as necessary, into collections of relations that are in BCNF?

Solution

d.

5)

4)

3) BD C, AB D, AC B, BD A For each given FD, the closure of the left-side attributes is ABCD. Thus, the left-side attributes of each FD contain a key, and the relation is in BCNF.

6)WE GET AB->B AND AB->E out of which AB->B satisfies bcnf property while AB->E doesnt satisfy BCNF