RELATION

Relation

In relational database theory, a relation, as originally defined by E.F. Codd, is a set of tuples, 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 an attribute value. An attribute is a name paired with a domain . An attribute value is an attribute name paired with an element of that attribute's domain, and a tuple is a set of attribute values in which no two distinct elements have the ...

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relation

Noun

  1. The manner in which two things may be associated.
    The relation between diet and health is complex.
  2. A member of one's family.
    Yes, he's a relation of mine, but a only distant one.
  3. The act of relating a story.
    Your relation of the events is different from mine.
  4. A set of ordered tuples.
  5. Specifically, a set of ordered pairs.
    Equality is a symmetric relation, while divisibility is not.
  6. A set of ordered tuples retrievable by a relational database; a table.
    This relation uses the customer's social security number as a key.
  7. A statement of equality of two products of generators, used in the presentation of a group.
  8. The act of intercourse


The above text is a snippet from Wiktionary: relation
and as such is available under the Creative Commons Attribution/Share-Alike License.

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