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The Entity-Relationship Data Model, also called ER, is one of the various data models you can use to reason about your data.. In particular, it's a conceptual data model, as it's not linked to any particular implementation.That's a task left to the logic data model. The ER Data Model is so general, so high level, that it can be implemented by a variety of completely different kinds of. Olx Erd Diagram. Jul 28, 2017 · OLX did not respond to Moneycontrol’s query on the rise in the number of such listings in the past 12 months in the major Indian cities- Delhi, Mumbai, Bengaluru, Chennai, Hyderabad and Kolkata. in. OLX Clasificados gratis. 500 million+ members | Manage your professional identity. . ng ) you dont need to register gain, just visit www.