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In database theory, a relation, as originally defined by E. F. Codd, is a set of tuples (d 1,d 2,...,d n ), where each element d j is a member of D j, a data domain. Codd's original definition notwithstanding, and contrary to the usual definition in mathematics, there is no ordering to the elements of the tuples of a relation. Instead, each element is termed an attribute value. An attribute is a n... Wikipedia