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What is 1NF and 2NF normal form? - Database management system

Presidency University, Bangalore - Database management system


Asked On2017-07-06 06:15:18 by:Aparna-Dasgupta

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First Normal Form (1NF)
A relation will be 1NF if it contains an atomic value.
It states that an attribute of a table cannot hold multiple values. It must hold only single-valued attribute.
First normal form disallows the multi-valued attribute, composite attribute, and their combinations.

Second Normal Form (2NF)
In the 2NF, relational must be in 1NF.
In the second normal form, all non-key attributes are fully functional dependent on the primary key

Answerd on:2022-08-17 Answerd By:sanjanamandhare

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The normal forms apply to individual relations. The relation is said to be in particular normal form if it satisfies constraints. A relation is in 1NF if it contains an atomic value. A relation will be in 2NF if it is in 1NF and all non-key attributes are fully functional dependent on the primary key.

Answerd on:2022-06-29 Answerd By:Suraj125

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First Normal Form (1NF):

As per First Normal Form, no two Rows of data must contain repeating group of information i.e each set of column must have a unique value, such that multiple columns cannot be used to fetch the same row. Each table should be organized into rows, and each row should have a primary key that distinguishes it as unique.

The Primary key is usually a single column, but sometimes more than one column can be combined to create a single primary key.


Second Normal Form (2NF):

As per the Second Normal Form there must not be any partial dependency of any column on primary key. It means that for a table that has concatenated primary key, each column in the table that is not part of the primary key must depend upon the entire concatenated key for its existence. If any column depends only on one part of the concatenated key, then the table fails Second normal form.
Answerd on:2017-07-09 Answerd By:Fututron

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