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What are different categories of data models?

  1. High-level or conceptual data models.

  2. Representational data models.

  3. Low-level or physical data models.

High level data models provide the concepts that are close to the way many users perceive data.

Representational data models are provide concepts that provide the concepts that may be understood by end users but that are not too far removed from organization of data in the database.

Physical data models describe the details of how data is stored in the computers.