满足3nf而不满足bcnf

（ABC）{AB → C, C → B}

候选码为{(AB),(AC)}

AB → C，AB在候选码中满足3nf

C → B，C在候选码中满足3nf

AB → C，AB是超码满足bcnf

C → B，C在不是超码不满足bcnf