## relation

<*mathematics*> A subset of the product of two sets, R : A
x B. If (a, b) is an element of R then we write a R b,
meaning a is related to b by R. A relation may be:
reflexive (a R a), symmetric (a R b => b R a),
transitive (a R b & b R c => a R c), antisymmetric (a R b
& b R a => a = b) or total (a R b or b R a).

See equivalence relation, partial ordering, pre-order, total ordering.

<*database*> A table in a relational database.

Last updated: 1995-02-28

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**relation**» relational algebra » relational calculus » relational database