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What does a primary key allow a user to do in a database?

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A primary key is the field (or fields) that is often employed to specifically identify each record in a table.

What is the role of this key?

The Primary key is known to be the key that helps a user to be able to form a specific identifier for each row in one's table.

Note that  it helps a person to link your table to other tables and as such, a  primary key is the field (or fields) that is often employed to specifically identify each record in a table.

Learn more about  primary key from

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