Exercise 3.3.1: For following relation schema and sets of FDs:

R(A,B,C,D) with FDs A->B,B->C,C->D, and D->A

i) Indicate all the BCNF violations. Do not forget to consider FDs 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. ii) Decompose the relations, as necessary, into collections of relations that are in BCNF.