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Relvar vs Superkey - What's the difference?

relvar | superkey |

As nouns the difference between relvar and superkey

is that relvar is a variable that contains a relation, as distinguished from the relation itself while superkey is any set of attributes of a relation variable (relvar) that serve to identify a single tuple or row, no other tuple having the same value for every attribute in the set.

relvar

English

Noun

(en noun) (wikipedia relvar)
  • (databases, nonstandard) A variable that contains a relation, as distinguished from the relation itself.
    • ----

    superkey

    English

    Noun

    (en noun) (wikipedia superkey)
  • (databases) Any set of attributes of a relation variable (relvar) that serve to identify a single tuple or row, no other tuple having the same value for every attribute in the set.