Give example of relational schema, Database Management System

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An instance of relational schema R (A, B, C) has distinct values of A including NULL values. then A is a candidate key or not?

If relational schema R (A, B, C) has distinct values of A including NULL values A is not a candidate key.

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Assignment, am looking for assignment helper for dbms

am looking for assignment helper for dbms

Inheritance, what is relationship inheritance and attribute inheritance

what is relationship inheritance and attribute inheritance

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