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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/69128


    Title: A Methodology for Schema Integration Using Concept Hierarchies
    Authors: 陳良弼
    Tsai,Pauray S. M.;Chen,Arbee L. P.
    Contributors: 資科系
    Date: 1999
    Issue Date: 2014-08-21 14:47:53 (UTC+8)
    Abstract: Since relational DBMSs are wide-spread, providing a relational global view for users who are only familiar with the relational model to access data in a multidatabase system is significant. However, the prior work on schema integration can not efficiently capture the relationships among relations from different databases. In this paper, we propose an approach to integrate database schemas into a relational global view which consists of concept hierarchies. A concept hierarchy is composed of relation schemes with the same concept, in which specialization and generalization can be specified to enrich the semantics of the relational view. Based on the concept hierarchies, a procedure is designed to decompose a global query to local subqueries and a set of transformation rules is developed to transform a query into an equivalent one for query optimization.
    Relation: Integrated Computer-Aided Engineering (EI),6(3),233-248
    Data Type: article
    Appears in Collections:[Department of Computer Science ] Periodical Articles

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