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  • A data model is a collection of conceptual tools for describing data, data relationships, data semantics, and consistency constraints.
  • 2 data models : the entity-relationship model and the relational model

  • ER model is a high-level data model. It is based on a perception of a real world that consists of a collection of basic objects, called entities, and of relationships among these objects.
  • The relational model is a lower-level model. It uses a collection of tables to represent both data and the relationships among those data.
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