What is Functional dependency?

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Hi!!

I am new to database, can someone explain to me what is a functional dependency.

Thanks!
Aug 10, 2018 in Database by CodingByHeart77
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1 answer to this question.

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A relation is said to be in Functional dependency when one attribute uniquely defines another attribute.

For Example, R is a Relation, X and Y are two attributes. T1 and T2 are two tuples.

 Then,

T1[X]=T2[X] and T1[Y]=T2[Y] means the value of component X uniquely define the value of component Y.

Also, X->Y means Y is functionally dependent on X.

answered Aug 10, 2018 by DataKing99
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