Which database level is closest to the users, Database Management System

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Which database level is closest to the users?

External database level is closest to the users.

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Define a relation schema, A Relation Schema represented by R(A1, A2, .....

A Relation Schema represented by R(A1, A2, ..., An) is made up of the relation name the list of attributes and R Ai that it contains. A relation is described as a set of tuples

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