%0 Conference Paper %B , First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS '91. Proceedings %D 1991 %T An algebra and calculus for relational multidatabase systems %A Grant,J. %A Litwin,W. %A Roussopoulos, Nick %A Sellis,T. %K Algebra %K autonomous databases %K Calculus %K Computer networks %K Computer science %K Data models %K Data structures %K Database systems %K database theory %K distributed databases %K Military computing %K multidatabase manipulation language %K multidatabase system %K multirelational algebra %K query languages %K relational algebra %K Relational databases %K Spatial databases %K theoretical foundation %X 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 %B , First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS '91. Proceedings %I IEEE %P 118 - 124 %8 1991/04// %@ 0-8186-2205-9 %G eng %R 10.1109/IMS.1991.153694