Question

The purpose of the primary key in a database is to

Answer 1

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$The main purpose of a Primary Key in a database is to <b><u>prevent duplicate data entry so that all the records remain unique</u>/b>. So, it is mainly used for defining relationships between tables.$

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Answer 2

The purpose of Primary key is to find the unique record in the database management system

Explanation:

• The primary key is used to finding a unique record in the database. It means the data in each column is unique. There are the following properties of the Primary key.

               1    It never holds Null value.

               2  Used for finding a unique record.

• For example: In the bank "account number "is the primary key.The bank account number is finding the unique record of each customer also no two customers have a unique account number.  

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What is Primary key ?

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