Incomplete Information in Relational Databases
Journal of the ACM (JACM)
The relational model for database management: version 2
The relational model for database management: version 2
On the representation and querying of sets of possible worlds
Selected papers of the workshop on Deductive database theory
Answering queries using views (extended abstract)
PODS '95 Proceedings of the fourteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Answering recursive queries using views
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Complexity of answering queries using materialized views
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Information Integration Using Logical Views
ICDT '97 Proceedings of the 6th International Conference on Database Theory
Data Exchange: Semantics and Query Answering
ICDT '03 Proceedings of the 9th International Conference on Database Theory
Answering Queries Using Views over Description Logics Knowledge Bases
Proceedings of the Seventeenth National Conference on Artificial Intelligence and Twelfth Conference on Innovative Applications of Artificial Intelligence
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
On the decidability and complexity of query answering over inconsistent and incomplete databases
Proceedings of the twenty-second ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Partial answers in information integration systems
WIDM '03 Proceedings of the 5th ACM international workshop on Web information and data management
Composing schema mappings: Second-order dependencies to the rescue
ACM Transactions on Database Systems (TODS) - Special Issue: SIGMOD/PODS 2004
Data exchange and incomplete information
Proceedings of the twenty-fifth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Beauty and the beast: the theory and practice of information integration
ICDT'07 Proceedings of the 11th international conference on Database Theory
World-set decompositions: expressiveness and efficient algorithms
ICDT'07 Proceedings of the 11th international conference on Database Theory
Containment of conjunctive queries over databases with null values
ICDT'07 Proceedings of the 11th international conference on Database Theory
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Information integration is becoming a critical problem for both businesses and individuals. The data, especially the one that comes from the Web, is naturally incomplete, that is, some data values may be unknown or lost because of communication problems, hidden due to privacy considerations. At the same time research in (virtual) integration in the community focusses on null-free sources and addresses limited forms of incompleteness only. In our work we aim to extend current results on virtual integration by considering various forms of incompleteness at the level of the sources, the integrated database and the queries (we call this Incomplete Information Integration, or III). More specifically, we aim to extend current query answering techniques for local-, and global-as-view integration to integration of tables with SQL nulls, Codd tables, etc. We also aim to consider incomplete answers as a natural extension of the classical approach. Our main research issues are (i) semantics of III, (ii) semantics of query answering in III, (iii) complexity of query answering, and (iv) algorithms (possibly approximate) to compute the answers.