functional dependency means
Functional Dependency. Functional Dependency is the starting point for the process of normalization. Functional dependency exists when a relationship between two attributes allows you to uniquely determine the corresponding attributeâs value.If âXâ is known, and as a result you are able to uniquely identify âYâ, there is functional dependency. Combined with keys, normal forms are defined for relations.unctional dependency exists when a relationship between two attributes allows you to uniquely determine the corresponding attributeâs value. If âXâ is known, and as a result you are able to uniquely identify âYâ, there is functional dependency.