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dc.contributor.authorBhasker, Bharaten_US
dc.contributor.authorEgyhazy, Csaba J.en_US
dc.contributor.authorTriantis, Konstantinosen_US
dc.date.accessioned2013-06-19T14:36:01Z
dc.date.available2013-06-19T14:36:01Z
dc.date.issued1992
dc.identifierhttp://eprints.cs.vt.edu/archive/00000337/en_US
dc.identifier.urihttp://hdl.handle.net/10919/19824
dc.descriptionThis report describes a query language based on algebra for heterogeneous databases. The database logic is used as a uniform framework for studying the heterogeneous databases. The data model based on the database logic is referred to as cluster data model in this report. Generalized Structured Query Language (GSQL) is used for expressing ad-hoc queries over the relational, hierarchical and network database uniformly. For the purpose of query optimization, a query language that can express the primitive heterogeneous database operations is required. This report describes such a query language for the clusters (i.e., heterogeneous databases). The cluster algebra consists of (a) generalized relational operations such as selection, union, intersection, difference, semi-join, rename and cross-product; (b) modified relational operations such as normal projection and normal join; and (c) new operations such as normalize, embed, and unembed.en_US
dc.format.mimetypeapplication/pdfen_US
dc.publisherDepartment of Computer Science, Virginia Polytechnic Institute & State Universityen_US
dc.relation.ispartofHistorical Collection(Till Dec 2001)en_US
dc.titleCluster Algebra: A Query Language for Heterogeneous Databasesen_US
dc.typeTechnical reporten_US
dc.identifier.trnumberTR-92-57en_US
dc.type.dcmitypeTexten_US
dc.identifier.sourceurlhttp://eprints.cs.vt.edu/archive/00000337/01/TR-92-57.pdf


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