Encyclopedia of Database Systems

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

Visual Query Language

  • Tiziana Catarci
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_448

Synonyms

Visual query system

Definition

Visual query languages (VQLs) are languages for querying databases that use a visual representation to depict the domain of interest and express related requests. VQLs provide a language to express the queries in a visual format, and they are oriented toward a wide spectrum of users, especially novices who have limited computer expertise and generally ignore the inner structure of the accessed database. Systems implementing VQLs are usually called visual query systems (VQSs) [1].

Historical Background

The birth of VQLs was due to several needs, including providing a friendly human-computer interaction, allowing database search by nontechnical users, and introducing a mechanism for comfortable navigation even in case of incomplete and ambiguous queries. It is worth noting that the real precursor of VQLs was QBE, already proposed by Moshe Zloof in 1977 [2].

QBE was really ahead of its time. Indeed, the Zloof’s paper states: “the formulation of a...

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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.Dipartimento di Ingegneria Informatica, Automatica e Gestionale “A.Ruberti”Sapienza – Università di RomaRomeItaly

Section editors and affiliations

  • Tiziana Catarci
    • 1
  1. 1.Dept. di Ingegneria Informatica, Automatica e GestionaleUniversita di RomaRomaItaly