project, Database Management System

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Preliminary entities and attributes of human resourse management database management system

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What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.

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What is foreign key? Foreign Key - Let there are two relations in tables R and S. Any candidate key of the relation R that is referred in the relation S is known as the forei

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What is view in SQL? How is it defined? Any relation that is not part of the logical model, but is made visible to a user as a virtual relation is known as a view. We descri

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