student database, Database Management System

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tell me the functionality,advantages and disadvantages of student database

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What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm

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Aggregation Aggregation is stronger form of association. It represents the "has-a" or "part-of" relationship. An aggregation association depicts a complex object which is comp

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#question.what is mapping constraints and types?.

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