Incomplete Information in Relational Databases
Journal of the ACM (JACM)
On the representation and querying of sets of possible worlds
SIGMOD '87 Proceedings of the 1987 ACM SIGMOD international conference on Management of data
PODS '89 Proceedings of the eighth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Indefinite and maybe information in relational databases
ACM Transactions on Database Systems (TODS)
Imprecise information and uncertainty in information systems
ACM Transactions on Information Systems (TOIS)
Accommodating imprecision in database systems: issues and solutions
ACM SIGMOD Record - Directions for future database research & development
Handling missing data by using stored truth values
ACM SIGMOD Record
PCTE: the standard for open repositories
PCTE: the standard for open repositories
Error propagation in distributed databases
CIKM '95 Proceedings of the fourth international conference on Information and knowledge management
A statistical approach to incomplete information in database systems
ACM Transactions on Database Systems (TODS)
On semantic issues connected with incomplete information databases
ACM Transactions on Database Systems (TODS)
Extending the database relational model to capture more meaning
ACM Transactions on Database Systems (TODS)
Four valued logic for relational database systems
ACM SIGMOD Record
Readings in Fuzzy Sets for Intelligent Systems
Readings in Fuzzy Sets for Intelligent Systems
Null values in data base management a denotational semantics approach
SIGMOD '79 Proceedings of the 1979 ACM SIGMOD international conference on Management of data
On relational algebra with marked nulls preliminary version
PODS '84 Proceedings of the 3rd ACM SIGACT-SIGMOD symposium on Principles of database systems
W3QS: A Query System for the World-Wide Web
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Reasoning about Binary Topological Relations
SSD '91 Proceedings of the Second International Symposium on Advances in Spatial Databases
Database Access in Mobile Environments
DEXA '96 Proceedings of the 7th International Conference on Database and Expert Systems Applications
P-OQL: an OQL-oriented query language for Pcte
SEE '95 Proceedings of the 1995 Software Engineering Environment Conferences
Exposing the vagueness of query results on partly inaccessible databases
Proceedings of the tenth international conference on Information and knowledge management
A Closed Approach to Vague Collections in Partly Inaccessible Distributed Databases
ADBIS '99 Proceedings of the Third East European Conference on Advances in Databases and Information Systems
Fuzzy multiattribute grey related analysis using DEA
Computers & Mathematics with Applications
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An important characteristic of distributed object management systems is that due to network or machine failure, the environment may become partitioned into subenvironments that cannot communicate with each other. In some application scenarios, it is important that the subenvironments remain operable even in this case. In particular, queries should be processed in an appropriate way. To this end, the final and all intermediate results of a query in a distributed object management system must be regarded as potentially vague. In this paper, we propose a hybrid representation for vague sets and vague multisets designed for this application context. The representation consists of an enumerating part, which contains the elements we could access during query processing, and a descriptive part, which describes the relevant elements we could not access. We introduce Propagation Rules which can be used to minimize the vagueness of a query result represented in this hybrid way. The main advantage of our approach is that the descriptive part of the representation can be used to improve the enumerating part during query processing.