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A data model is
|“||[a] graphical and textual representation of data needed by an organization to represent achievement of its mission, functions, goals, objectives, and strategies. A data model is represented by its entities, attributes, and relationships among its entities. In the relational model of data, entities are tables, attributes are columns, and relationships are primary and foreign key pairs. Data models may be enriched beyond data structures with both constraints and embedded processes.||”|