0
$\begingroup$

Let say we have a relation with 5 attributes {A, B, C, D, E}. Let say we have two candidate keys as A and B,C. Let us say we have a partial dependency as B -> E with regards to the candidate key B,C. The database designer decides that A will be the primary key of the relation. Now since we had B -> E, will it be called a partial dependency or a transitive dependency? Is the relation 2NF or not even 2NF?

$\endgroup$
1
$\begingroup$

As the definition of the 2NF is:

A functional dependency on part of any candidate key is a violation of 2NF. In addition to the primary key, the relation may contain other candidate keys; it is necessary to establish that no non-prime attributes have part-key dependencies on any of these candidate keys.

This schema is not in 2NF.

| cite | improve this answer | |
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.