175Accesses
Synonyms
Visual query language (VQL); Visual query system (VQS)
Definition
A particular type of visual query language specifically targeted for data stream processing. As the classical visual query languages, it provides a language, consisting of a set of visual constructs, to express, in a visual format, queries on data transmitted in a continuous and unbounded fashion (i.e., data streams). It is important to note that this class of languages can be seen as an extension of the generic visual query languages (for further details, consult the entry on the encyclopedia), due to the fact that they can query, in a visual manner and using the same criteria of classical VQLs, both data streams and classical relational databases. They are oriented to a wide spectrum of users, even those ones who have some knowledge about concepts related to data streaming but with no skills in developing code.
Historical Background
The importance of data streams in the information technology field is...
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Recommended Reading
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Author information
Authors and Affiliations
Dipartimento di Ingegneria Informatica, Automatica e Gestionale “A.Ruberti”, Sapienza – Università di Roma, Rome, Italy
Tiziana Catarci & Mariano Leva
University of Padua, Padua, Italy
Massimo Mecella
- Tiziana Catarci
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- Mariano Leva
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Corresponding author
Correspondence toTiziana Catarci.
Editor information
Editors and Affiliations
Georgia Institute of Technology College of Computing, Atlanta, GA, USA
Ling Liu
University of Waterloo School of Computer Science, Waterloo, ON, Canada
M. Tamer Özsu
Section Editor information
Dept. di Ingegneria Informatica, Automatica e Gestionale, Universita di Roma, Rome, 185, Italy
Tiziana Catarci
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Catarci, T., Leva, M., Mecella, M. (2018). Visual Query Languages for Data Stream. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_80666
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