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

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

Presidency University, Bangalore - Database management system

By:Aparna-Dasgupta

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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.
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