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Making a change to the conceptual schema of a database but not affecting the existing.

Making a change to the conceptual schema of a database but not affecting the existing external schemas is an example of
(a)  Physical data independence             (b)  Concurrency Control                       
(c)  Logical data independence               (d)  Functional dependency                   
(e)  Integrity Control.

Jan 02 2018 View more View Less

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