Types of Functional Dependencies in Normalization

FD

Functional Dependency:

In Relational database, Functional dependency is denoted as X -> Y where X:Determinant and Y: Dependent. So, as per the concept the value of Y gets determined by the value of X.

If value of X gets duplicated, then in those rows value of Y shall also gets duplicated correspondingly.

If the determinant X value is unique (different) then the dependent Y could have any value meaning:

  • for same X , value of Y should be same.

  • for different X, value of Y could be same or different.

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