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Relation (database)

In database theory, a relation, as originally defined by E. F. Codd, is a set of tuples (d1,d2,...,dn), where each element dj is a member of Dj, 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…

Overview, Relation variables & Examples

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Map overview Semantic statistics

Relation (database)

Nodes26
Edges25
Triples0
Avg. degree1.92
Density0.076923
Components1

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Important terminology

relation set heading tuples tuple name attribute variables paired thus schema database variable domain sql also definition data term values

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc

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