Normalization

• 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, undesirable characteristics like Insertion, Update and Deletion Anomalies.
• Normalization divides the larger table into the smaller table and links them using relationships.
• The normal form is used to reduce redundancy from the database table.

Types of Normal Forms

There are the four types of normal forms:

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's normal form and has no multi-valued dependency.
5NF	A relation is in 5NF if it is in 4NF and does not contain any join dependency and joining should be lossless.