翻訳と辞書
Words near each other
・ Identical
・ Identical (novel)
・ Identical ancestors point
・ Identical case
・ Identical note
・ Identical particles
・ Identical Remote Controlled Reactions
・ Identical Strangers
・ Identical Twins, Roselle, New Jersey, 1967
・ Identicon
・ Identifiability
・ Identifiability Analysis
・ Identifiable victim effect
・ Identification
・ Identification (biology)
Identification (information)
・ Identification (literature)
・ Identification (psychology)
・ Identification badges of the Uniform Services of the United States
・ Identification friend or foe
・ Identification in Burkean rhetoric
・ Identification in Nazi camps
・ Identification in rhetoric
・ Identification key
・ Identification of a Woman
・ Identification of Fixed Objects in Public Transport
・ Identification of medicinal products
・ Identification of trees of the northeastern United States
・ Identification Parade
・ Identification Projection Series


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Identification (information) : ウィキペディア英語版
Identification (information)

The function of identification is to map a known quantity to an unknown entity so as to make it known. The known quantity is called the identifier (or ID) and the unknown entity is what needs identification. A basic requirement for identification is that the ID be unique. IDs may be scoped, that is, they are unique only within a particular scope. IDs may also be built out of a collection of quantities such that they are unique on the collective.
For data storage, identification is the capability to find, retrieve, report, change, or delete specific data without ambiguity. This applies especially to information stored in databases. In database normalisation, the process of organizing the fields and tables of a relational database to minimize redundancy and dependency, is the central, defining function of the discipline.
== Relational database example ==

To retrieve the data stored about an individual with the Internal Revenue Service (IRS) of the United States, the IRS needs to be supplied with the individual's Social Security number (SSN). The SSN, then, "identifies" a unique individual to the IRS. No other living person has that SSN and that individual is assumed to not have more than one SSN. Other data that the individual's SSN identifies with the IRS would be such things as his or her name, birthdate, and current employer.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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