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SQL Full Course: SQL 2NF, Second Normal Form2NF in Hindi #sql #sqlforbeginners
SQL Second Normal Form (2NF) is a database normalization technique that aims to eliminate data redundancy and improve data integrity by ensuring that all non-key attributes are dependent on the entire primary key. It is achieved by breaking down a table into multiple tables to eliminate partial dependencies.

To satisfy the 2NF, a table must meet the following requirements:

1. It must already be in First Normal Form (1NF)
2. It must not have any partial dependencies, meaning that all non-key attributes must be dependent on the entire primary key and not just part of it.

To achieve 2NF, the following steps can be followed:

1. Identify the primary key of the table and list all the attributes that depend on it.
2. Identify any attributes that are dependent on only part of the primary key.
3. Create a new table for each partial dependency, including the dependent attribute and the portion of the primary key it is dependent on.
4. Replace the partial dependency in the original table with a foreign key reference to the new table.

By following these steps, we can ensure that all data is correctly normalized and that there is no data redundancy. This helps to improve data integrity and makes the database more efficient and easier to manage.