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What is transitive dependency ?

Transitive dependency is a functional dependency which holds by virtue of transitivity. A transitive dependency can occur only in a relation that has three or more attributes. Let A, B, and C designate three distinct attributes (or distinct collections of attributes) in the relation.

Suppose all three of the following conditions hold:

 A -> B

 It is not the case that B ? A

 B ->C

Then the functional dependency A -> C (which follows from 1 and 3 by the  axiom of transitivity) is a transitive dependency.

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