database model, Database Management System

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Why older data models are being replaced by new data modelling 100 words accepted#

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Define the terms   i) DDL   ii) DML   DDL: Data base schema is specified by a set of definitions expressed by a special   language known as a data def

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Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes

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