Foundations of logic programming; (2nd extended ed.)
Foundations of logic programming; (2nd extended ed.)
Identifying Extended Entity-Relationship Object Structures in Relational Schemas
IEEE Transactions on Software Engineering
Containment and minimization of positive conjunctive queries in OODB's
PODS '92 Proceedings of the eleventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
SQL/EER—syntax and semantics of an entity-relationship-based query language
Information Systems
ERL: logic for entity-relationship databases
Journal of Intelligent Information Systems
Answering recursive queries using views
PODS '97 Proceedings of the sixteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
On the decidability of query containment under constraints
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Conjunctive-query containment and constraint satisfaction
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Consistent query answers in inconsistent databases
PODS '99 Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Testing implications of data dependencies
ACM Transactions on Database Systems (TODS)
The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
On the Complexity of Testing Implications of Functional and Join Dependencies
Journal of the ACM (JACM)
A relational model of data for large shared data banks
Communications of the ACM
Complexity and expressive power of logic programming
ACM Computing Surveys (CSUR)
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
Entity-Relationship Modeling: Foundations of Database Technology
Entity-Relationship Modeling: Foundations of Database Technology
Real-world Data is Dirty: Data Cleansing and The Merge/Purge Problem
Data Mining and Knowledge Discovery
Accessing Data Integration Systems through Conceptual Schemas
ER '01 Proceedings of the 20th International Conference on Conceptual Modeling: Conceptual Modeling
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
Data integration under integrity constraints
Information Systems - Special issue: The 14th international conference on advanced information systems engineering (CAiSE*02)
Minimal-change integrity maintenance using tuple deletions
Information and Computation
Data exchange: semantics and query answering
Theoretical Computer Science - Database theory
Efficient core computation in data exchange
Journal of the ACM (JACM)
Proceedings of the twenty-seventh ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Characterizing data complexity for conjunctive query answering in expressive description logics
AAAI'06 Proceedings of the 21st national conference on Artificial intelligence - Volume 1
DL-Lite: tractable description logics for ontologies
AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 2
Query rewriting and answering under constraints in data integration systems
IJCAI'03 Proceedings of the 18th international joint conference on Artificial intelligence
Querying incomplete data with logic programs: ER strikes back
ER'07 Proceedings of the 26th international conference on Conceptual modeling
Containment of conjunctive queries over conceptual schemata
DASFAA'06 Proceedings of the 11th international conference on Database Systems for Advanced Applications
Consistent query answers in virtual data integration systems
Inconsistency Tolerance
Query answering under expressive entity-relationship schemata
ER'10 Proceedings of the 29th international conference on Conceptual modeling
Ontological query answering under expressive Entity-Relationship schemata
Information Systems
ADBIS'12 Proceedings of the 16th East European conference on Advances in Databases and Information Systems
Taming the infinite chase: query answering under expressive relational constraints
Journal of Artificial Intelligence Research
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Since Chen's Entity-Relationship (ER) model, conceptual modeling has been playing a fundamental role in relational data design. In this paper we consider an extended ER (EER) model enriched with cardinality constraints, disjointness assertions, and is a relations among both entities and relationships. In this setting, we consider the case of incomplete data, which is likely to occur, for instance, when data from different sources are integrated. In such a context, we address the problem of providing correct answers to conjunctive queries by reasoning on the schema. Based on previous results about decidability of the problem, we provide a query answering algorithm that performs rewriting of the initial query into a recursive Datalog query encoding the information about the schema. We finally show extensions to more general settings.