• Normalization is the process of organizing the data in the database.
  • Normalization is used to minimize the redundancy from a relation or set of relations. It is also used to eliminate the undesirable characteristics like Insertion, Update and Deletion Anomalies.
  • Normalization divides the larger table into the smaller table and links them using relationship.
  • The normal form is used to reduce redundancy from the database table.

Types of Normal Forms

There are the four types of normal forms:

DBMS Normalization
Normal Form Description
1NF A relation is in 1NF if it contains an atomic value.
2NF A relation will be in 2NF if it is in 1NF and all non-key attributes are fully functional dependent on the primary key.
3NF A relation will be in 3NF if it is in 2NF and no transition dependency exists.
4NF A relation will be in 4NF if it is in Boyce Codd normal form and has no multi-valued dependency.
5NF A relation is in 5NF if it is in 4NF and not contains any join dependency and joining should be lossless.

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DBMS Normalization