Example Of Normal Forms

First normal form 1nf as per the rule of first normal form an attribute column of a table cannot hold multiple values.

Example of normal forms. The main purpose of applying the normalization technique is to reduce the redundancy and dependency of data. Database normalization is a well known technique used for designing database schema. It should hold only atomic values.

Now that the definition of functional dependency is covered let s look into the draw backs of data redundancy and more concerning issues or rather anomalies w r t insertion deletion and updating data. But we suggest you to understand other normal forms before you head over to the fourth normal form. The first normal form is the normal form of database where data must not contain repeating groups the database is in first normal form if 1 it contains only automic values.

Sixth normal form or 6nf. Suppose a company wants to store the names and contact details of its employees. This tutorial will explain what is database normalization and various normal forms like 1nf 2nf 3nf and bcnf with sql code examples.

Here is the fourth normal form tutorial. First normal form if a relation contain composite or multi valued attribute it violates first normal form or a relation is in first normal form if it does not contain any composite or multi valued attribute. Fourth normal form 4nf a table is said to be in the fourth normal form when it is in the boyce codd normal form.

Fifth normal form or 5nf. Essential tuple normal form or etnf. For example there are discussions even on 6 th normal form.

Domain key normal form or dknf. It is the simplest database model also known as non first normal form nf2 a unf model will suffer problems like data redundancy thus it lacks the efficiency of database normalization. The 1nf is normal form will satisfy following conditions 1 the data in this normal form contains atomic values.