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Question

5 NF is related to ______________.

A
Functional dependency
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B
Multivalued dependency
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C
Join dependency
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D
None of these
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Solution

The correct option is C Join dependency

5 NF is related to join dependency.

Fifth normal form (5NF), also known as project-join normal form (PJ/NF) is a level of database normalization designed to reduce redundancy in relational databases recording multi-valued facts by isolating semantically related multiple relationships. A table is said to be in the 5NF if and only if every non-trivial join dependency in that table is implied by the candidate keys.

Join dependency is a constraint on the set of legal relations over a database scheme.


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