What is Functional Dependency?

by Nirmala 2010-04-07 09:37:43

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.

Tagged in:

776
like
0
dislike
0
mail
flag

You must LOGIN to add comments