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unique key

one or more columns that can be used to uniquely identify a row in a table. A table can have one or more unique keys. Unlike a primary key, a unique key can contain null values.

See also primary key.

See also foreign key.



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SAS Institute - SAS 9.1.3 ETL Studio. User's Guide
SAS 9.1.3 ETL Studio: Users Guide
ISBN: 1590476352
EAN: 2147483647
Year: 2004
Pages: 127
Authors: SAS Institute

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