A key is an attribute, or group of attributes, that assumes a unique value for each entity instance. It is sometimes called an identifier.

Name: A key is an attribute, or group of attributes, that assumes a unique value for each entity instance. It is sometimes called an identifier.
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A key uniquely identifies each record in a database table, and it is often referred to as an identifier because it distinguishes each entity instance from others.

A Key Is an Attribute, or Group of Attributes, That