Distributed databases principles and systems
Distributed databases principles and systems
Multidatabase Interoperability
Computer
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
ACM Transactions on Database Systems (TODS)
MSQL: a multidatabase language
Information Sciences: an International Journal
Principles of Database Systems
Principles of Database Systems
A relational algebra for data/metadata integration in a federated database system
Proceedings of the tenth international conference on Information and knowledge management
SchemaSQL: An extension to SQL for multidatabase interoperability
ACM Transactions on Database Systems (TODS)
Query Optimization in Multidatabase Systems Considering Schema Conflicts
IEEE Transactions on Knowledge and Data Engineering
nD-SQL: A Multi-Dimensional Language for Interoperability and OLAP
VLDB '98 Proceedings of the 24rd International Conference on Very Large Data Bases
On Efficiently Implementing SchemaSQL on an SQL Database System
VLDB '99 Proceedings of the 25th International Conference on Very Large Data Bases
SchemaSQL - A Language for Interoperability in Relational Multi-Database Systems
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
Design and Implementation of a Novel Approach to Keyword Searching in Relational Databases
ADBIS-DASFAA '00 Proceedings of the East-European Conference on Advances in Databases and Information Systems Held Jointly with International Conference on Database Systems for Advanced Applications: Current Issues in Databases and Information Systems
Limiting Result Cardinalities for Multidatabase Queries Using Histograms
BNCOD 18 Proceedings of the 18th British National Conference on Databases: Advances in Databases
Relational languages for metadata integration
ACM Transactions on Database Systems (TODS)
A Query Language for MOF Repository Systems
OTM '08 Proceedings of the OTM 2008 Confederated International Conferences, CoopIS, DOA, GADA, IS, and ODBASE 2008. Part I on On the Move to Meaningful Internet Systems:
Electronic Notes in Theoretical Computer Science (ENTCS)
Sharing mobile databases in dynamically configurable environments
CAiSE'03 Proceedings of the 15th international conference on Advanced information systems engineering
Analysing multi-dimensional data across autonomous data warehouses
DaWaK'06 Proceedings of the 8th international conference on Data Warehousing and Knowledge Discovery
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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, such as MSQL. We 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. It is shown that properties of the multirelational algebra may be used for optimization and that every multirelational algebra query can be expressed as a multirelational calculus query. The connection between the multirelational languages and MSQL, the multidatabase version of SQL, is also investigated.