Computer Sciences > GATE 2024 Set-2 > Database Design
A functional dependency F:X → Y is termed as a 'useful functional dependency' if and only if it satisfies all the following three conditions:
• X is not the empty set.
• Y is not the empty set.
• Intersection of X and Y is the empty set.
For a relation R with 4 attributes, the total number of possible useful functional dependencies is
• X is not the empty set.
• Y is not the empty set.
• Intersection of X and Y is the empty set.
For a relation R with 4 attributes, the total number of possible useful functional dependencies is
Correct : 84
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