Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Updates Through Views

  • Yannis Velegrakis
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_847

Definition

Views are windows to a database. They provide access to only a portion of the data that is either of interest or related to an application. Views are relations without independent existence, as is the case of database tables created with the “create table” command. The contents of the instance of a view are determined by the result of a query on a set of database tables, typically referred to as base tables. Applications deal with views the same way they deal with any other relation. In fact, an application is rarely aware of whether a relation it is accessing is a base table or a view. This means that the application may issue updates on the view relation as it would have done with any other database table. Since the view instance depends on the instances of the base tables, to execute an update on the view one needs to find a number of base table modifications whose effect on the view instance is the modification described by the update command. These modifications are...

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Recommended Reading

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Information Engineering and Computer ScienceUniversity of TrentoTrentoItaly

Section editors and affiliations

  • Yannis Kotidis
    • 1
  1. 1.Department of InformaticsAthens University of Economics and BusinessAthensGreece