Query classes [chapter]

Martin Staudt, Matthias Jarke, Manfred A. Jeusfeld, Hans W. Nissen
<span title="">1993</span> <i title="Springer Berlin Heidelberg"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
Deductive object-oriented databases advocate the advantage of combining object-oriented and deductive paradigms into a single data model. Certainly, the query language in such a data model has to re ect the amalgamation because it works as the interface to the user and/or application program. This paper proposes a language to formulate queries as classes related to the schema classes and constrained by an associative membership condition. Answers are then regarded as their instances. The
more &raquo; ... etation is based on a deductive database view of queries. Generic query classes are introduced with a simple parameter substitution construct. The syntactic separation of structural and associative conditions opens the way to semantic query optimization: subsumption between the structural parts of queries can be decided e ciently.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/3-540-57530-8_18">doi:10.1007/3-540-57530-8_18</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/jq63ztqn5va7verouef7jxh4e4">fatcat:jq63ztqn5va7verouef7jxh4e4</a> </span>
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