Relational model: Difference between revisions

Revision as of 03:22, 17 June 2016

Revision as of 19:56, 20 June 2016

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{{merge from|Life cycle of a relational database|date=April 2016}}

The '''relational model''' ('''RM''') for [[database]] management is an approach to managing data using a structure and language consistent with [[first-order logic|first-order predicate logic]], first described in 1969 by [[Edgar F. Codd]].<ref>{{Citation | title = Derivability, Redundancy, and Consistency of Relations Stored in Large Data Banks | first = E.F | last = Codd | publisher = IBM | series = Research Report | year = 1969}}.</ref><ref name= "codd1970">{{cite journal|last= Codd |first= E.F |year=1970|title=A Relational Model of Data for Large Shared Data Banks | series = Classics | url= http://www.acm.org/classics/nov95/toc.html |journal=[[Communications of the ACM]] |volume= 13 |issue= 6 |pages= 377–87 |doi= 10.1145/362384.362685}}</ref> In the relational model of a database, all data is represented in terms of [[tuple]]s, grouped into [[relation (database)|relation]]s. A database organized in terms of the relational model is a [[relational database]].