Design And Implementation Of Extended Boolean And Comparison Operators For Time-Oriented Query Languages

    Authors

    M. A. Bassiouni; A. Mukherjee;M. J. Llewellyn

    Comments

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    Abbreviated Journal Title

    Comput. J.

    Keywords

    HISTORICAL DATABASES; Computer Science, Hardware & Architecture; Computer Science, Information; Systems; Computer Science, Software Engineering; Computer Science, ; Theory & Methods

    Abstract

    Standard Boolean and comparison operators are based on the True/False logic and are therefore not quite suitable for handling events/activities defined over periods of time. In this paper, we generalize the Boolean and comparison operators by allowing their input and output operands to be sets of time intervals. Efficient algorithms for the implementation of the extended operators are presented. The generalized operators can be used to enhance the user interface of time-oriented query languages and allow application users to express their time-related qualifications more succinctly and elegantly. The paper is concluded by examples showing the flexibility of the extended operators in expressing time-related requirements.

    Journal Title

    Computer Journal

    Volume

    37

    Issue/Number

    7

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    576

    Last Page

    587

    WOS Identifier

    WOS:A1994PX10500002

    ISSN

    0010-4620

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