Error propagation in distributed databases
CIKM '95 Proceedings of the fourth international conference on Information and knowledge management
A probabilistic relational algebra for the integration of information retrieval and database systems
ACM Transactions on Information Systems (TOIS)
A Hybrid Representation of Vague Collections for Distributed Object Management Systems
IEEE Transactions on Knowledge and Data Engineering
Fast High-Dimensional Data Search in Incomplete Databases
VLDB '98 Proceedings of the 24rd International Conference on Very Large Data Bases
Temporal Databases with Null Values
DEXA '00 Proceedings of the 11th International Conference on Database and Expert Systems Applications
Reverse Nearest Neighbors Search in Ad Hoc Subspaces
IEEE Transactions on Knowledge and Data Engineering
Consistency enforcement in databases
Proceedings of the 2nd international conference on Semantics in databases
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This paper proposes a specific four-valued logic (4VL) as a means of handling missing data in Relational Data Base Management systems. The proposed 4VL is a minor variant of the standard 4VL in which the “least true” condition is interpreted as “inapplicable” rather than “false”. The use of this 4VL is defended on the grounds that by defining several additional unary operators, the 4VL can be rendered intuitively manageable. The proposed unary operators contribute to the conceptual utility of the 4VL by providing an explicit way for users to relate familiar results of two-valued logic to analogous results in 4VL.