What is a Super Key ?

 Posted by Raj.Trivedi on 6/9/2013 | Category: Sql Server Interview questions | Views: 1826 | Points: 40

Super Key is a key which is used to define uniqueness of a row with the collection of more than one column

Eg:- There is Customer Table

The Primary Key will be CustomerID field but this cannot be termed as a Super key
To be a Super key we can club 2 columns such as
CustomerID and LastName of the Customer.

If we see the above eg over here we have club 2 columns and uniquely identified a ROW

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