database models, Database Management System

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why are older data models are being replaced by new data models

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Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp

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What is Relational calculus? Relational calculus is a Non- Procedural language.

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(a)    Provide the description of the following ODMG schema in the Object Definition Language (ODL). (b)   Based on the above object database, write the following queries i

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