Database normalization it's Types

Database normalization is a process used to organize a database in a way that reduces redundancy and dependency. It is a key aspect of database design that helps to improve the structure and integrity of a database.

There are several types of normalization, and each one is designed to address specific types of data redundancy and dependency. The most common normal forms are:

1. First Normal Form (1NF): In 1NF, each cell in a table must contain a single value, and each column must have a unique name.
2. Second Normal Form (2NF): In 2NF, all non-key attributes must be dependent on the entire primary key.
3. Third Normal Form (3NF): In 3NF, no non-key attribute is dependent on any other non-key attribute.
4. Boyce-Codd Normal Form (BCNF): In BCNF, every determinant (a column or set of columns that determines the value of another column) must be a candidate key.
5. Fourth Normal Form (4NF): In 4NF, a table must not contain more than one multivalued dependency.
6. Fifth Normal Form (5NF): In 5NF, also known as Project-Join Normal Form (PJNF), a table must not contain two or more independent many-to-many relationships that are not directly related.

Normalization helps to improve the efficiency and effectiveness of a database by reducing redundancy, minimizing data inconsistencies, and improving data integrity. It is an important process for ensuring that a database is well-structured and able to support the needs of the users.