An algebra and calculus for relational multidatabase systems

TitleAn algebra and calculus for relational multidatabase systems
Publication TypeConference Papers
Year of Publication1991
AuthorsGrant J, Litwin W, Roussopoulos N, Sellis T
Conference Name, First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS '91. Proceedings
Date Published1991/04//
ISBN Number0-8186-2205-9
KeywordsAlgebra, autonomous databases, Calculus, Computer networks, Computer science, Data models, Data structures, Database systems, database theory, distributed databases, Military computing, multidatabase manipulation language, multidatabase system, multirelational algebra, query languages, relational algebra, Relational databases, Spatial databases, theoretical foundation

With the existence of many autonomous databases widely accessible through computer networks, users will require the capability to jointly manipulate data in different databases. A multidatabase system provides such a capability through a multidatabase manipulation language. The authors propose a theoretical foundation for such languages by presenting a multirelational algebra and calculus based on the relational algebra and calculus. The proposal is illustrated by various queries on an example multidatabase