Transitive dependency in DBMS

What is Transitive Dependency

When an indirect relationship causes functional dependency it is called Transitive Dependency.

If  P -> Q and Q -> R is true, then P-> R is a transitive dependency.

To achieve 3NF, eliminate the Transitive Dependency.

Example

<MovieListing>

The above table is not in 3NF because it has a transitive functional dependency −

Therefore, the following has transitive functional dependency.

Movie_ID -> Listing_Type

The above states the relation <MovieListing> violates the 3rd Normal Form (3NF).

To remove the violation, you need to split the tables and remove the transitive functional dependency.

<Movie>

Movie_ID

<Listing>

Listing_ID

Now the above relation is in Third Normal Form (3NF) of Normalization.

Alex Onsman

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Updated on: 15-Jun-2020

20K+ Views

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