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UML and Data Modeling: A Reconciliation by David Hay

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Most entity/relationship notations have no special symbol for derived attributes, and this is a shortcoming in the available tools. So, by convention, one can always surround an attribute name with parentheses if it is derived, and Oracle Corporations Designer does provide for documenting the formulae for such an attribute.

Using derived attributes is an extremely powerful way to present many important concepts in a model, and using them, when appropriate, is highly recommended. Back in ancient times (around 1981), your author encountered a database management system (called Mitrol Information Management SystemMIMS) that had a feature he had never before (and has never since) encountered. You could specify a computed ...

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