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In the Entity-Relationship model, what is the difference between an entity instance and an entity class?

April 26, 2017class difference entity instance model

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In the Entity-Relationship model, what is the difference between an entity instance and an entity class?

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Entity instances can be grouped together into entity classes. In a corporate database model, EMPLOYEE is an entity class and Anthony Jones is an instance of the EMPLOYEE entity class. Lawn Mower is an instance of the PRODUCT entity class.