A comparative analysis of methodologies for database schema integration
ACM Computing Surveys (CSUR)
MSQL: a multidatabase language
Information Sciences: an International Journal
On resolving schematic heterogeneity in multidatabase systems
Distributed and Parallel Databases
Automated resolution of semantic heterogeneity in multidatabases
ACM Transactions on Database Systems (TODS)
Schema architecture of the UniSQL/M multidatabase system
Modern database systems
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
Schema integration for multidatabases using the unified relational and object-oriented model
CSC '95 Proceedings of the 1995 ACM 23rd annual conference on Computer science
Managing semantic heterogeneity in databases: a theoretical prospective
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Issues and approaches of database integration
Communications of the ACM
Predicate rewriting for translating Boolean queries in a heterogeneous information system
ACM Transactions on Information Systems (TOIS)
Semantic integration of semistructured and structured data sources
ACM SIGMOD Record
Introduction to a system for distributed databases (SDD-1)
ACM Transactions on Database Systems (TODS)
A Methodology for Integration of Heterogeneous Databases
IEEE Transactions on Knowledge and Data Engineering
Global Viewing of Heterogeneous Data Sources
IEEE Transactions on Knowledge and Data Engineering
Querying Semistructured Heterogeneous Information
DOOD '95 Proceedings of the Fourth International Conference on Deductive and Object-Oriented Databases
SchemaSQL - A Language for Interoperability in Relational Multi-Database Systems
VLDB '96 Proceedings of the 22th International Conference on Very Large Data Bases
So Far (Schematically) yet So Near (Semantically)
Proceedings of the IFIP WG 2.6 Database Semantics Conference on Interoperable Database Systems (DS-5)
A Practical Approach to Access Heterogeneous and Distributed Databases
CAiSE '99 Proceedings of the 11th International Conference on Advanced Information Systems Engineering
QUICK: graphical user interface to multiple databases
DEXA '96 Proceedings of the 7th International Workshop on Database and Expert Systems Applications
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Several approaches have been proposed to provide access to data which is spread across different sources. Prominent among these are the approaches taken in federated systems and multidatabase systems. The main thrust is to provide the user with a mechanism to access several databases in a unified way. However, in all these systems the user is not isolated from specifying the path expressions in the query. In our system, we propose a query language, Structure Independent Query Language (SIQL), which has no reference to the structure of the databases. The structure is arrived at by the system by using the component databases that are registered with it. In general, there can be multiple queries that can be generated for a user query. We define 'closeness' criterion which imposes a ordering on the queries that can be generated. The queries are generated and executed according to this ordering and the result is presented to the user.