Most database modeling tools allow you to enter a data model in one or more high-level notations (e.g., ER, IDEF1X, ORM, or UML) as well as a logical-level notation (e.g., relational). Typically a ...
Previous chapters discussed how to model the structure of an application in terms of a conceptual schema, and then map it to a logical schema for implementation in a relational database system.
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