A field in a database table that serves as a unique identifier is called an autonumber key.

Name: A field in a database table that serves as a unique identifier is called an autonumber key.
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A field in a database table that serves as a unique identifier is typically called a primary key. An autonumber key is a type of primary key, but it specifically refers to a primary key that is automatically incremented by the database system.

A Field in a Database Table That Serves as a Unique