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Data Modeling Made Simple with ER/Studio Data Architect by Steve Hoberman

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A logical data model (LDM) is a business solution to a business problem. It is how the modeler captures the business requirements without complicating the model with implementation concerns such as software and hardware.

On the conceptual data model, we might learn, for example, what the terms, business rules, and scope would be for a new order entry system. After understanding the requirements for the order entry system, we create a LDM containing all of the attributes and business rules needed to deliver the application. For example, the conceptual data model will show that a Customer places many Orders. The LDM will capture all of the details behind Customer and Order, such as the customers name, ...

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