Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
Incomplete Information in Relational Databases
Journal of the ACM (JACM)
Language features for flexible handling of exceptions in information systems
ACM Transactions on Database Systems (TODS)
A sound and sometimes complete query evaluation algorithm for relational databases with null values
Journal of the ACM (JACM)
On understanding types, data abstraction, and polymorphism
ACM Computing Surveys (CSUR) - The MIT Press scientific computation series
Login: A logic programming language with built-in inheritance
Journal of Logic Programming
Formalizing nonmonotonic reasoning systems
Artificial Intelligence
The mathematics of inheritance systems
The mathematics of inheritance systems
Intelligent query answering in rule based systems
Journal of Logic Programming
Semantic database modeling: survey, applications, and research issues
ACM Computing Surveys (CSUR)
Modeling class hierarchies with contradictions
SIGMOD '88 Proceedings of the 1988 ACM SIGMOD international conference on Management of data
Efficient implementation of lattice operations
ACM Transactions on Programming Languages and Systems (TOPLAS)
Incorporating hierarchy in a relational model of data
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
F-logic: a higher-order language for reasoning about objects, inheritance, and scheme
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Efficient management of transitive relationships in large data and knowledge bases
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Integrity = validity + completeness
ACM Transactions on Database Systems (TODS)
Using integrity constraints to provide intensional answers to relational queries
VLDB '89 Proceedings of the 15th international conference on Very large data bases
A compression technique to materialize transitive closure
ACM Transactions on Database Systems (TODS)
A foundation of CODD's relational maybe-operations
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
Closed World Databases Opened Through Null Values
VLDB '88 Proceedings of the 14th International Conference on Very Large Data Bases
Recovering Information from Summary Data
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
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In this article, we present an extended relational algebra with universally or existentially quantified classes as attribute values. The proposed extension can greatly enhance the expressive power of relational systems, and significantly reduce the size of a database, at small additional computational cost. We also show how the proposed extensions can be built on top of a standard relational database system.