Question: how to do bcnf decomposition?
Answer: Decompose R into BCNF form: If R is not in BCNF, we decompose R into a set of relations S that are in BCNF. Thus, R(A,B,C,D,E) is decomposed into a set of relations: R1(A,C,E), R2(A,B) and R3(C,D) that satisfies BCNF.