candidate for a key
Смотреть что такое "candidate for a key" в других словарях:
Candidate key — In the relational model, a candidate key of a relvar (relation variable) is a set of attributes of that relvar such that # at all times it holds in the relation assigned to that variable that there are no two distinct tuples with the same values… … Wikipedia
The Manchurian Candidate (1962 film) — For the novel by Richard Condon, see The Manchurian Candidate. For the 2004 film, see The Manchurian Candidate (2004 film) Infobox Film name = The Manchurian Candidate director = John Frankenheimer producer = George Axelrod John Frankenheimer… … Wikipedia
Natural key — In relational model database design, a natural key is a candidate key that has a logical relationship to the attributes within that row. A natural key is sometimes called a domain key. The main advantage of a natural key over a surrogate key,… … Wikipedia
National Association for the Advancement of Colored People — Abbreviation NAACP … Wikipedia
Students for a Democratic Society — This article is about the 1960s organization. For the more recent organization, see Students for a Democratic Society (2006 organization). Students for a Democratic Society (SDS) was a student activist movement in the United States that was one… … Wikipedia
Treaty establishing a Constitution for Europe — This article is about the abandoned 2004 proposal. For the constitutional basis of the EU, see Treaties of the European Union. Treaty establishing a Constitution for Europe Type Unratified treaty Drafted June 2004 Signed 29 October 2004 Location… … Wikipedia
The Candidate (1972 film) — Infobox Film name = The Candidate caption = Theatrical release poster director = Michael Ritchie producer = Walter Coblenz writer = Jeremy Larner starring = Robert Redford, Peter Boyle music = John Rubinstein cinematography = Victor J. Kemper,… … Wikipedia
Mr. Monk and the Candidate — Monk episode Excuse me Monk s fear of heights allows Ian Sykes on the left to slip past him on a la … Wikipedia
Club for Growth — The Club for Growth is a politically conservative 527 organization active in the United States of America, with an agenda focussed on taxation and other economic issues, and with an affiliated political action committee (PAC). The Club advocates… … Wikipedia
Foreign key — In the context of relational databases, a foreign key is a referential constraint between two tables. [ [http://www.visualcase.com/kbase/database basics foreign keys.htm For a simpler visualization, see VisualCase.com] ] The foreign key… … Wikipedia
Alternate key — You may have meant the Alt key on the keyboard. An alternate key (or secondary key) is any candidate key which is not selected to be the primary key (PK).For example, a relational database with a table employee could have attributes like employee … Wikipedia
