Superkey

Summary

• A superkey is defined in the relational model as a set of attributes of a relation for which it holds that in all instances of the relation there are no two distinct tuples that have the same values for the attributes in this set. Equivalently a superkey can also be defined as those sets of attributes of a relation upon which all attributes of the relation are functionally dependent.

Similar Topics

• None

Related Topics

• Relational model

  * This page is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Superkey".