NDLI: A multi-set extended relational algebra: a formal approach to a practical issue

Content Provider	IEEE Xplore Digital Library
Author	Grefen, P.W.P.J. de By, R.A.
Copyright Year	1994
Description	Author affiliation: Twente Univ., Enschede, Netherlands (Grefen, P.W.P.J.; de By, R.A.)
Abstract	The relational data model is based on sets of tuples, i.e. it does not allow duplicate tuples an a relation. Many database languages and systems do require multi-set semantics though, either because of functional requirements or because of the high costs of duplicate removal in database operations. Several proposals have been presented that discuss multi-set semantics. As these proposals tend to be either rather practical, lacking the formal background, or rather formal, lacking the connection to database practice, the gap between theory and practice has not been spanned yet. This paper proposes a complete extended relational algebra with multi-set semantics, having a clear formal background and a close connection to the standard relational algebra. It includes constructs that extend the algebra to a complete sequential database manipulation language that can either be used as a formal background to other multi-set languages like SQL, or as a database manipulation language on its own. The practical usability of the latter option has been demonstrated in the PRISMA/DB database project, where a variant of the language has been used as the primary database language.<>
Starting Page	80
Ending Page	88
File Size	706915
Page Count	9
File Format	PDF
ISBN	0818654023
DOI	10.1109/ICDE.1994.283002
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-02-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Algebra Relational databases Data models Proposals Database languages Cost function Transaction databases Set theory Query processing
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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