1NF: Eliminate Repeating Groups:-
Make a separate table for each set of related attributes, and give each table a primary key. Each field
contains at most one value from its attribute domain.
2NF: Eliminate Redundant Data:-
If an attribute depends on only part of a multi-valued key, remove it to a separate table.
3NF: Eliminate Columns Not Dependent On Key:-
If attributes do not contribute to a description of the key, remove them to a separate table. All
attributes must be directly dependent on the primary key.
BCNF: Boyce-Codd Normal Form:-
If there are non-trivial dependencies between candidate key attributes, separate them out into distinct
4NF: Isolate Independent Multiple Relationships:-
No table may contain two or more 1:n or n:m relationships that are not directly related.
5NF: Isolate Semantically Related Multiple Relationships:-
There may be practical constrains on information that justify separating logically related many-to-many
ONF: Optimal Normal Form:-
A model limited to only simple (elemental) facts, as expressed in Object Role Model notation.
DKNF: Domain-Key Normal Form:-
A model free from all modification anomalies.
Remember, these normalization guidelines are cumulative. For a database to be in 3NF, it must first
fulfill all the criteria of a 2NF and 1NF database.