Identifier that is unique among all other used identifiers
Not to be confused with the many systems of unique identifiers, many of which have non-unique proper names such as Unique Identifier, UID, or Unique Identification Number.
A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose.[1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type.
In relational databases, certain attributes of an entity that serve as unique identifiers are called primary keys.[2]
In mathematics, set theory uses the concept of element indices as unique identifiers.
^McMurry, Julie A.; et al. (2017). "Identifiers for the 21st century: How to design, provision, and reuse persistent identifiers to maximize utility and impact of life science data". PLOS Biology. 15 (6): e2001414. doi:10.1371/JOURNAL.PBIO.2001414. PMC 5490878. PMID 28662064.
^Kline, Kevin E.; Kline, Daniel; Hunt, Brand (2009). SQL in a nutshell (3rd ed.). Beijing: O'Reilly. ISBN 978-0-596-51884-4. OCLC 244652620.
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