Database Systems Practice Tests
Database Systems Online Tests
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MCQ 1: Aggregate functions can operate over multiple occurrences of a value, known to be
MCQ 2: The second extended relational-algebra operation is the
MCQ 3: The operations with the ability to express queries that cannot be expressed by the basic relational-algebra operations, is known as
MCQ 4: The aggregate function that returns the number of the elements in the collection is known as
MCQ 5: The operation that takes both the left and right outer join operations, is known as
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