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What is the uniquely identifiable element about which data can be categorized in an entity-relationship diagram?

User Midrare
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The uniquely identifiable element about which data can be categorized in an entity-relationship diagram is the entity type. The entity type is the fundamental building block,  which defines a collection or set of entities that have the same attributes and it is used for describing the structure of data with the Entity Data Model (EDM).
User Robert Longson
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