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Bookmark: A primary key in sql server
A primary key is used to uniquely identify each row in a table. It can either be part of the actual record itself , or it can be an artificial field (one that has nothing to do with the actual record). A primary key can consist of one or more fields on a table. When multiple fields are used as a primary key, they are called a composite key.
URL: http://www.1keydata.com/sql/sql-primary-key.html
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