Define an operator that a relational algebra does not have, Database Management System

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Define an operator that a Relational Algebra does not have

Ans: Relational Algebra does not have Aggregation operators.

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Prove that a relation which is 4NF must be BCNF. Ans Let R be in 4NF. Suppose it is not in BCNF. Hence, there exists an FD X→Y in R such that x is not a super key. Although

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