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Boyce-Codd Normal Form (BCNF) remove non-candidate key…
Boyce-Codd Normal Form (BCNF) remove non-candidate key determinant
is
A relation is in BCNF if and only if every determinant is a candidate key
BCNF also has additional constraints compared with the general definition of 3NF.
Difference between 3NF and BNFC
a functional dependency A -> B:
3NF allows this dependency in a relation if B is a primary-key attribute and A is not a candidate key
Whereas, BCNF insists that for this dependency to remain in a relation, A must be a candidate key
Every relation in BCNF is also in 3NF. However, a relation in 3NF is not necessarily in BCNF
Example
Dreamhome example
Dependency
