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key database - translation to russian
![Basic structure of navigational [[CODASYL]] database model](https://commons.wikimedia.org/wiki/Special:FilePath/CodasylB.png?width=200 "Basic structure of navigational [[CODASYL]] database model")
![In the [[relational model]], records are "linked" using virtual keys not stored in the database but defined as needed between the data contained in the records.](https://commons.wikimedia.org/wiki/Special:FilePath/Relational key SVG.svg?width=200 "In the [[relational model]], records are \"linked\" using virtual keys not stored in the database but defined as needed between the data contained in the records.")
Смотрите также
['deitə()beis]
программирование
информационная база
база данных
дипломатия
исходные данные (на переговорах о разоружении)
Definition
Wikipedia
In relational database management systems, a unique key is a candidate key. All the candidate keys of a relation can uniquely identify the records of the relation, but only one of them is used as the primary key of the relation. The remaining candidate keys are called unique keys because they can uniquely identify a record in a relation. Unique keys can consist of multiple columns. Unique keys are also called alternate keys. Unique keys are an alternative to the primary key of the relation. In SQL, the unique keys have a UNIQUE constraint assigned to them in order to prevent duplicates (a duplicate entry is not valid in a unique column). Alternate keys may be used like the primary key when doing a single-table select or when filtering in a where clause, but are not typically used to join multiple tables.
