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What is Functional Dependency in database?

April 26, 2017database dependency Functional

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What is Functional Dependency in database?

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A Functional dependency is denoted by X—-> Y between two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This means the value of X component of a tuple uniquely determines the value of component Y.