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• 13:36, 14 January 2026 Root talk contribs created page ER and relational model (Created page with "= Introductory Concepts = Where data comes from: * Real world: This is the part of reality that interests us. It consists of concrete objects. * Logical or conceptual world (knowledge or information): An abstract model of the real world. * Representative world (data): The transition from the abstract model of information to a computer representation. == The Real World == From the real world, we must extract abstractions of what interests us. == The Conceptual World:...") Tag: Visual edit