Reasoning about functional dependencies generalized for semantic data models
ACM Transactions on Database Systems (TODS)
Extensible/rule based query rewrite optimization in Starburst
SIGMOD '92 Proceedings of the 1992 ACM SIGMOD international conference on Management of data
Understanding the new SQL: a complete guide
Understanding the new SQL: a complete guide
Optimization of real conjunctive queries
PODS '93 Proceedings of the twelfth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
ODMG-93: a standard for object-oriented DBMSs
SIGMOD '94 Proceedings of the 1994 ACM SIGMOD international conference on Management of data
The object database standard: ODMG 2.0
The object database standard: ODMG 2.0
Description logics for conceptual data modeling
Logics for databases and information systems
Integrity constraints: semantics and applications
Logics for databases and information systems
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Access path selection in a relational database management system
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
Reasoning About Equations and Functional Dependencies on Complex Objects
IEEE Transactions on Knowledge and Data Engineering
Description Logics in Data Management
IEEE Transactions on Knowledge and Data Engineering
Adding Uniqueness Constraints to Description Logics (Preliminary Report)
DOOD '97 Proceedings of the 5th International Conference on Deductive and Object-Oriented Databases
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Exploiting Uniqueness in Query Optimization
Proceedings of the Tenth International Conference on Data Engineering
VLDB '87 Proceedings of the 13th International Conference on Very Large Data Bases
The Magic of Duplicates and Aggregates
VLDB '90 Proceedings of the 16th International Conference on Very Large Data Bases
Query Optimization by Predicate Move-Around
VLDB '94 Proceedings of the 20th International Conference on Very Large Data Bases
Optimal implementation of conjunctive queries in relational data bases
STOC '77 Proceedings of the ninth annual ACM symposium on Theory of computing
Uniqueness constraints in object-relational databases and description logics
Uniqueness constraints in object-relational databases and description logics
A semantics and complete algorithm for subsumption in the classic description logic
Journal of Artificial Intelligence Research
On Reasoning about Structural Equality in XML: A Description Logic Approach
ICDT '03 Proceedings of the 9th International Conference on Database Theory
Query Processing in Embedded Control Programs
DBTel '01 Proceedings of the VLDB 2001 International Workshop on Databases in Telecommunications II
On keys and functional dependencies as first-class citizens in description logics
IJCAR'06 Proceedings of the Third international joint conference on Automated Reasoning
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Queries commonly perform much better if they manage to avoid duplicate elimination operations in their execution plans. In this paper, we report on a technique that provides a necessary and sufficient condition for removing such operators from object relational conjunctive queries under the standard duplicate semantics. The condition is fully captured as a membership problem in a dialect of description logic called CFD, which is capable of expressing a number of common constraints implicit in object relational database schemas. We also present a PTIME algorithm for arbitrary membership problems in CFD.