Primary Key

a: Primary key ~
b: social secruity number

What: In fact, the social security number is a primary key. By definition a primary key uniquely identifies a record in a database. This idea was necessary before electronic databases so as to keep track of individuals and their personal information. There are many unique identifiers that most people should be familiar with: license plates, finger prints and retinal scans all convey uniqueness.

Writer: LucretiaGermanica
Where: Reference Link Has Evaporated
Date: Dec 16 2011 7:53 PM

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