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63. What is 4NF?
Answer:
A relation schema R is said to be in 4NF if for every Multivalued dependency X ->-> Y that holds over R, one of following is true
> X is subset or equal to (or) XY = R.
> X is a super key.
Asked In :: iGate Virtusa Syntel Inc. Accenture Sapient Sopra Steria
A relation schema R is said to be in 4NF if for every Multivalued dependency X ->-> Y that holds over R, one of following is true
> X is subset or equal to (or) XY = R.
> X is a super key.
> X is subset or equal to (or) XY = R.
> X is a super key.