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What is Functional Dependency?
A Functional dependency is shown by X Y among 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 verifies the value of component Y.
usecase diagram,activity diagraM,SEQUENCE DIAGRAM
Functional Dependency Consider a relation R that has 2 attributes A and B. The attribute B of the relation is functionally dependent on the attribute A if and only if for every
Chapter 10a review questions
WHAT IS DSS? WRITE ITS REQUIREMENTS.
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Explain the main advantages of DBMS over File Oriented System ?
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