Define the boyce-codd normal form, Database Management System

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Define the Boyce-Codd Normal Form with instance and also Compare BCNF and 3NF.

Ans: BCNF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:

Y is a subset of X or,
X is a superkey of R

While

3NF: For each functional dependency X->Y in a set F of functional dependencies over relation R, either:

Y is a subset of X or,
X is a superkey of R, or
Y is a subset of K for few key K of R

a. there is no subset of a key is a key

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