What is functional dependency?
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What is functional dependency?
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Functional dependency is a result of the interrelationship among the attributes of an entity represented by a relation, or the relationship between entities that are also represented by a relation. If R is an entity, and X is its key attribute and Y is another attribute, then X -> Y means Y is functionally dependent on X (i.e. for any given value of X, there will be a corresponding value of Y.).
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