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difference between super key and primary key?

on 2011-11-03 07:36:28   by sarita   on Computer Science & Engineering  1 answers

Rajni

on 2011-11-03 09:30:00  

Different set of attributes which are able to identify any row in the database is known as super key. And minimal super key is termed as candidate key i.e. among set of super keys one with minimum number of attributes. Primary key could be any key which is able to identify a specific row in database in a unique manner.