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A Lsuperkey is a combination of columns that uniquely identifies any row within a relational database management system (RDBMS) table. A candidate key is a closely related concept where the superkey is reduced to the minimum number of columns required to uniquely identify each row.

# First Last Handle
1 Mark Otto @mdo
2 Jacob Thornton @fat
3 Larry the Bird @twitter
First Name Last Name Hero Title
Bruce Wayne Batman
Peter Parker Spiderman
Bruce Banner The Hulk
Clark Kent Superman