Incomplete Information in Relational Databases
Journal of the ACM (JACM)
A formal view integration method
SIGMOD '86 Proceedings of the 1986 ACM SIGMOD international conference on Management of data
A comparative analysis of methodologies for database schema integration
ACM Computing Surveys (CSUR)
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Towards a sound view integration methodology
PODS '83 Proceedings of the 2nd ACM SIGACT-SIGMOD symposium on Principles of database systems
Model independent assertions for integration of heterogeneous schemas
The VLDB Journal — The International Journal on Very Large Data Bases
View Integration: A Step Forward in Solving Structural Conflicts
IEEE Transactions on Knowledge and Data Engineering
The Use of Information Capacity in Schema Integration and Translation
VLDB '93 Proceedings of the 19th International Conference on Very Large Data Bases
Supporting executable mappings in model management
Proceedings of the 2005 ACM SIGMOD international conference on Management of data
Data exchange: semantics and query answering
Theoretical Computer Science - Database theory
Model management 2.0: manipulating richer mappings
Proceedings of the 2007 ACM SIGMOD international conference on Management of data
ACM Transactions on Database Systems (TODS)
Schema merging and mapping creation for relational sources
EDBT '08 Proceedings of the 11th international conference on Extending database technology: Advances in database technology
Interactive generation of integrated schemas
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
Bootstrapping pay-as-you-go data integration systems
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
STBenchmark: towards a benchmark for mapping systems
Proceedings of the VLDB Endowment
Top-k generation of integrated schemas based on directed and weighted correspondences
Proceedings of the 2009 ACM SIGMOD International Conference on Management of data
CAiSE'07 Proceedings of the 19th international conference on Advanced information systems engineering
Foundations of schema mapping management
Proceedings of the twenty-ninth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Automatic schema merging using mapping constraints among incomplete sources
CIKM '10 Proceedings of the 19th ACM international conference on Information and knowledge management
Automatic generation of mediated schemas through reasoning over data dependencies
ICDE '11 Proceedings of the 2011 IEEE 27th International Conference on Data Engineering
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Schema integration is the procedure to integrate several inter-related schemas to produce a unified schema, called the mediated schema. There are two major flavors of schema integration: data integration and view integration. The former deals with integrating multiple data sources to create a mediated query interface, while the latter aims at constructing a base schema, capable of supporting the source schemas as views. Our work builds upon previous approaches that address relational view integration using logical mapping constraints. Given a set of data dependencies over the source schemas as input, our approach produces a minimal information-preserving mediated schema with constraints, and it generates output mappings defining the source schemas as views. We extend previous approaches in several aspects. First, schema minimization is performed within a scope of Project-Join views that are information preserving and produce a smaller mediated schema than in existing work. Second, the input schema mapping language is expressive enough for not only query containment but also query equivalence. Third, source integrity constraints can be seamlessly incorporated into reasoning. Last but not least, we have evaluated our implementation over both real world data sets and a schema mapping benchmark.