What are the different types of database normalization?

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Answered by suresh

Types of Database Normalization

Types of Database Normalization

Database normalization is a process used to organize a database in a way that reduces redundancy and dependency by dividing large tables into smaller ones.

There are different types of database normalization, which are:

  1. First Normal Form (1NF): Ensures that each column in a table contains only atomic values.
  2. Second Normal Form (2NF): Requires that the table is in 1NF and all non-key attributes are fully dependent on the primary key.
  3. Third Normal Form (3NF): Ensures that the table is in 2NF and all the columns are dependent only on the primary key.
  4. Boyce-Codd Normal Form (BCNF): Requires that for every non-trivial functional dependency X -> Y, X must be a superkey.
  5. Fourth Normal Form (4NF): A table is in 4NF if it has no multi-valued dependencies.
  6. Fifth Normal Form (5NF): Deals with cases where a table contains join dependencies that cannot be removed by any other normalization.

Implementing these normalization forms helps in improving data integrity, reducing redundancy, and ensuring data consistency in the database.

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