Constraint query algebras View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1996-09

AUTHORS

Dina Q Goldin, Paris C. Kanellakis

ABSTRACT

Constraint query languages are natural extensions of relational database query languages. A framework for their declarative specification (constraint calculi) and efficient implementation (low data complexity and secondary storage indexing) was presented in Kanellakis et al., 1995. Constraint query algebras form a procedural language layer between high-level declarative calculi and low-level indexing methods. Just like the relational algebra, this intermediate layer can be very useful for program optimization. In this paper, we study properties of constraint query algebras, which we present through three concrete examples. The dense order constraint algebra illustrates how the appropriate canonical form can simplify expensive operations, such as projection, and facilitate interaction with updates. The monotone two-variable linear constraint algebra illustrates the concept of strongly polynomial operations. Finally, the lazy evaluation of (non)linear constraint algebras illustrates how large numbers of (non)linear constraints could be implemented with only a small amount of costly symbolic processing. More... »

PAGES

45-83

References to SciGraph publications

  • 1995. Linear constraint query languages expressive power and complexity in LOGIC AND COMPUTATIONAL COMPLEXITY
  • 1972-09. Organization and maintenance of large ordered indexes in ACTA INFORMATICA
  • 1994. Constraint programming and database query languages in THEORETICAL ASPECTS OF COMPUTER SOFTWARE
  • 1985. Computational Geometry, An Introduction in NONE
  • Journal

    TITLE

    Constraints

    ISSUE

    1-2

    VOLUME

    1

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00143878

    DOI

    http://dx.doi.org/10.1007/bf00143878

    DIMENSIONS

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