Entity integrity means each instance of an entity type must have a unique identifier that is not null.

Name: Entity integrity means each instance of an entity type must have a unique identifier that is not null.
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Entity integrity is a concept in database design that requires each instance of an entity type to have a unique identifier (often called a primary key) that is not null. This is essential for ensuring data consistency and accuracy, and is a fundamental aspect of the relational database model.

Entity Integrity Means Each Instance of an Entity Type Must