TY - CONF T1 - An algebra and calculus for relational multidatabase systems T2 - , First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS '91. Proceedings Y1 - 1991 A1 - Grant,J. A1 - Litwin,W. A1 - Roussopoulos, Nick A1 - Sellis,T. KW - Algebra KW - autonomous databases KW - Calculus KW - Computer networks KW - Computer science KW - Data models KW - Data structures KW - Database systems KW - database theory KW - distributed databases KW - Military computing KW - multidatabase manipulation language KW - multidatabase system KW - multirelational algebra KW - query languages KW - relational algebra KW - Relational databases KW - Spatial databases KW - theoretical foundation AB - 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 JA - , First International Workshop on Interoperability in Multidatabase Systems, 1991. IMS '91. Proceedings PB - IEEE SN - 0-8186-2205-9 M3 - 10.1109/IMS.1991.153694 ER -