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PODS
1999
ACM
13 years 10 months ago
1999
ACM
In this paper we consider the problem of the logical characterization of the notion of consistent answer in a relational database that may violate given integrity constraints. Thi...
PODS
1999
ACM
13 years 10 months ago
1999
ACM
We identify one of the incompatibility problems associated with atomic commit :protocols that prevents them from being used together and weiderive a correctness criterion that cap...
PODS
1999
ACM
13 years 10 months ago
1999
ACM
We give a polymorphic account of the relational algebra. We introduce a formalism of \type formulas" speci cally tuned for relational algebra expressions, and present an algo...
PODS
1999
ACM
13 years 10 months ago
1999
ACM
One of the most important types of query processing in spatial databases and geographic information systems is the spatial join, an operation that selects, from two relations, all...
PODS
1999
ACM
13 years 10 months ago
1999
ACM
Despite advances in recent years in the area of mandatory access control in database systems, today's information repositories remain vulnerable to inference and data associa...