Domain Key Normal Form

The reason is that the insertion and updation anomalies are removed.

Domain key normal form. Domain key normal form is the highest form of normalization. The constraints are verified by the domain and key constraints. A domain constraint specifies the permissible values for a given attribute while a key constraint specifies the attributes that uniquely identify a row in a.

Historically the process of normalization and the process of discovering undesirable dependencies were carried through 5nf but it has been possible to define the stricter normal form that takes into account additional type of dependencies and constraints. Historically the process of normalization and the process of discovering undesirable dependencies were carried through 5nf but it has been possible to define the stricter normal form that takes into account additional type of dependencies and constraints. A domain constraint identifies clearly the permitted and enabled values for a given attribute while a key constraint identifies clearly the attributes that distinctly identify a row in a given table or relation.

It is based on constraints domain constraint. A domain key normal form is a normal form used in database normalization which needs particularly that the database contains no restrictions other than domain constraints and key constraints. Domain key normal form dknf there is no hard and fast rule to define normal form up to 5nf.

A table is in domain key normal form only if it is in 4nf 3nf and other normal forms. The basic idea behind the dknf is to specify the normal form that takes into account all the possible dependencies and constraints.