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      Finite Query Languages for Sequence Databases

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      Proceedings of the Fifth International Workshop on Database Programming Languages (DBPL-5)

      Database Programming Languages

      6-8 September 1995

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            Abstract

            This paper develops a query language for sequence databases, such as genome databases and text databases. Unlike relational data, queries over sequential data can easily produce infinite answer sets, since the universe of sequences is infinite, even for a finite alphabet. The challenge is to develop query languages that are both highly expressive and finite. This paper develops such a language. It is a subset of a recently developed logic called Sequence Datalog [19]. SequenceDatalog distinguishes syntactically between subsequence extraction and sequence construction . Extraction creates sequences of bounded length, and leads to safe recursion; while construction can create sequences of arbitrary length, and leads to unsafe recursion. In this paper, we develop syntactic restrictions for Sequence Datalog that allow sequence construction but preserve finiteness. The main idea is to use safe recursion to control and limit unsafe recursion. The main results are the definition of a finite form of recursion, called domain bounded recursion , and a characterization of its complexity and expressive power. Although finite, the resulting class of programs is highly expressive, since its data complexity is complete for the elementary functions.

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            Author and article information

            Contributors
            Conference
            September 1995
            September 1995
            : 1-13
            Affiliations
            [0001]D.I.F.A., Università della Basilicata

            via della Tecnica, 3

            85100 Potenza, Italy
            [0002]Department of Computer Science

            University of Toronto

            Toronto, Ontario, Canada
            Article
            10.14236/ewic/DBPL1995.21
            59ba88f1-4fa8-4daa-8ee8-2cf07b48590b
            © Giansalvatore Mecca et al. Published by BCS Learning and Development Ltd. Proceedings of the Fifth International Workshop on Database Programming Languages, Gubbio, Umbria, Italy

            This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

            Proceedings of the Fifth International Workshop on Database Programming Languages
            DBPL-5
            5
            Gubbio, Umbria, Italy
            6-8 September 1995
            Electronic Workshops in Computing (eWiC)
            Database Programming Languages
            Product
            Product Information: 1477-9358BCS Learning & Development
            Self URI (journal page): https://ewic.bcs.org/
            Categories
            Electronic Workshops in Computing

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