Explanation BCNF: BOYCE-CODD NORMAL FORM: Boyce-Codd normal form (BCNF) is a structure and algorithm for the normalization of relational databases. BCNF requires that there be no non-trivial functional dependencies of attributes on something other than a superset of a candidate key (called a superkey). At this stage, all attributes are dependent on a key, a whole key and nothing but a key (excluding trivial dependencies, like A->A). A table is said to be in the BCNF if and only if it is in the 3NF and every non-trivial, left-irreducible functional dependency has a candidate key as its determinant. In more informal terms, a table is in BCNF if it is in 3NF and the only determinants are the candidate keys.
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