Jump to content

Key

From Wikipedia, the free encyclopedia
This is an old revision of this page, as edited by DBooth (talk | contribs) at 15:44, 7 February 2021 (Added another reference). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Key or The Key may refer to:

Common meanings

Geography

  • Cay, also spelled key, a small, low-elevation, sandy island formed on the surface of a coral reef

United States

Elsewhere

Arts and media

Films

Literature

Music

Albums

Songs

Television

Other uses in arts and media

People

Sports

Technology

Other uses

  • Key (company), a Japanese visual novel studio
  • The Key School, an independent coeducational school in Annapolis, Maryland
  • Keys, a truce term used in western Scotland
  • Amazon Key, a service by Amazon allowing customers to get deliveries inside of their home or car
  • House of Keys, the directly elected lower branch of Tynwald, the parliament of the Isle of Man
  • Samara (fruit) or key, a type of fruit

See also

References

  1. ^ Jeffrey D. Ullman. Principles of Database Systems, Second Edition. Computer Science Press. 1982. Page 13: "An attribute or set of attributes whose values uniquely identify each entity in an entity set is called a key."
  2. ^ Shamkant B. Navathe and Ramez Elmasri. Fundamentals of Database Systems. Benjamin/Cummings Publishing Company. 1989. Page 43: "An important constraint on the entities of an entity type is the key or uniqueness constraint on attributes."
  3. ^ BBC, Bitesize, Computer Science. Types of keys (Web page). https://www.bbc.co.uk/bitesize/guides/z4wf8xs/revision/4 "In a relational database, keys ensure that any record in a table can be uniquely identified by one field or a combination of fields in the table." Retrieved 07-Feb-2021.
  4. ^ Encyclopedia, PC Magazine. Key field (Web page). https://www.pcmag.com/encyclopedia/term/key-field "A field in a record that holds unique data which identifies that record from all the other records in the file or database. Account number, product code and customer name are typical key fields. As an identifier, each key value must be unique in each record." Retrieved 07-Feb-2021.
  5. ^ Awad, Elias (1985), Systems Analysis and Design, Second Edition, Richard D. Irwin, Inc., ISBN 0-256-02824-9 "A key is a unique identifier".