Friday, 9 December 2016

What is meant by full functional dependency

Define full functional dependency / When would you say that an attribute is fully functionally dependent on other attributes? / What is full functional dependency?


Full Functional Dependency


In a functional dependency A  B, (A is a set of attributes and B is another set of attributes), the dependency where B is fully dependent on A, and not on any of the subset of A is called Full Functional dependency. For example, assume that attributes P and Q together can only uniquely identify the value of the other attribute R. Then, PQ R is Full Functional Dependency. 

As another example, let us consider the set F of functional dependencies; F = { B, AD B }. In this case, the FD B is full functional dependency whereas AD B is not full, that is B is not fully functionally dependent on AD, instead it depends on A alone.





No comments:

Post a comment

Featured Content

Multiple choice questions in Natural Language Processing Home

MCQ in Natural Language Processing, Quiz questions with answers in NLP, Top interview questions in NLP with answers Multiple Choice Que...

All time most popular contents