Question
A B C is a set of attributes. The functional dependency is as follows

AB -> B AC -> C C -> B
a) is in 1NF

b) is in 2NF

c) is in 3NF

d) is in BCNF
Answers
(a) is in 1NF since (AC)+ = { A, B, C} hence AC is the primary key. Since C B is a FD given, where neither C is a Key nor B is a prime attribute, this it is not in 3NF. Further B is not functionally dependent on key AC thus it is not in 2NF. Thus the given FDs is in 1NF.   Your Comment




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