In order to design a good database Functional Dependencies in Database is an important concept. In order to ensure the integrity of data and a good performance of a database functional dependencies plays an important role. Definition of Functional Dependency on Wikipedia HERE.
Suppose we have a relation in database where there are only two attributes X and Y:
Functional Dependency Def.
X –> Y
if t1.X = t2.X then t1.Y = t2.Y
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