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Encyclopedia of Database Systems pp 3325–3326Cite as

View Definition

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Synonyms

View expression

Definition

The definition of a view consists of the name of the view and of a query, whose result is used to determine the content of the view.

Key Points

A view is a virtual relation. Its content depends on the evaluation of a query over a set of base tables or other views in the database. This query is part of the view definition and is, typically, recomputed every time the view is referenced. In some cases, for efficiency, the tuples of a view may be materialized as a separate table in the database.

In relational systems, a view is defined using the create view command:

  • create view  < v > as < query expression > 

The name of the view in the above example is < v > and the schema and content of the view are derived on-demand by the evaluation of < query expression >, which should be a legal expression supported by the database management system. Different vendor systems may impose some constraints on the form of < query expression >, for instance they may...

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Recommended Reading

  1. Adiba M.E. and Lindsay B.G. Database snapshots. In Proc. 6th Int. Conf. on Very Data Bases, 1980, pp. 86–91.

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  2. Dayal U. and Bernstein P. On the correct translation of update operations on relational views. ACM Trans. Database Syst., 8(3):381–416, 1982.

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  3. Gupta A., Jagadish H.V., and Mumick I.S. Data integration using self-maintainable views. In Advances in Database Technology, Proc. 5th Int. Conf. on Extending Database Technology, 1996, pp. 140–144.

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  4. Gupta H., Harinarayan V., Rajaraman A., and Jeffrey D.U. Index selection for OLAP. In Proc. 13th Int. Conf. on Data Engineering, 1997, pp. 208–219.

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  5. Kotidis Y. and Roussopoulos N. DynaMat: a dynamic view management system for data warehouses. In Proc. ACM SIGMOD Int. Conf. on Management of Data, 1999, pp. 371–382.

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  6. Roussopoulos N. View indexing in relational databases. ACM Trans. Database Syst., 7(2):258–290, 1982.

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  7. Roussopoulos N. An incremental access method for viewCache: concept, algorithms, and cost analysis. ACM Trans. Database Syst., 16(3):535–563, 1991.

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Author information

Authors and Affiliations

  1. Athens University of Economics and Business, Athens, Greece

    Yannis Kotidis

Authors
  1. Yannis Kotidis
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Kotidis, Y. (2009). View Definition. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_854

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