Key

Key - A key is a field, or combination of fields, that uniquely identifies a record in a table. See also Primary Key.

[Category=Database Management ]

Source: Northwest Database Services, 10 November 2009 08:05:42, http://www.nwdatabase.com/database-glossary-k.htm

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Key - A way of accessing something. Any set of columns used for retrieval of rows from a table.

[Category=Data Warehousing ]

Source: Aexis Business Intelligence, 16 December 2010 12:31:18, http://www.aexis.eu/DataWarehouse-Glossary/

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key - [database structures] An attribute or set of attributes in a database that uniquely identifies each record.

[Category=Geospatial ]

Source: esri, 25 May 2012 09:25:58, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation