PODS
1994
ACM
13 years 11 months ago
1994
ACM
We present a typed polymorphic calculus that supports a general mechanism for view definition and object sharing among classes. In this calculus, a class can contain inclusion spe...
PODS
1994
ACM
13 years 11 months ago
1994
ACM
Abstract Appears in Proceedings of the Thirteenth Symposium on Principles of Database Systems, 1994 Ashish Gupta Yehoshua Sagivy Je rey D. Ullman Jennifer Widom Dept. of Computer S...
PODS
1994
ACM
13 years 11 months ago
1994
ACM
PODS
1994
ACM
13 years 11 months ago
1994
ACM
RULES
1993
Springer
13 years 11 months ago
1993
Springer
There have been many recent research efforts on temporal databases for managing current and historical data and on active databases for monitoring real-world events as well as dat...
RULES
1993
Springer
13 years 11 months ago
1993
Springer
Objects are collected into an object base because of a presumed need for cooperation among them. In classical object bases the cooperation is based on synchronous, preplanned mess...
RULES
1993
Springer
13 years 11 months ago
1993
Springer
Semantic models have shown the utility of arbitrary user-de ned relationships for de ning the semantics of database information, while objectoriented models have developed a stron...
ER
1992
Springer
13 years 11 months ago
1992
Springer
In this paper, we address the problem of supporting more exibility on the schema of object-oriented databases. We describe a general framework based on an object-oriented data mode...
PODS
1993
ACM
13 years 11 months ago
1993
ACM
PODS
1993
ACM
13 years 11 months ago
1993
ACM
In this paper, we motivate four di erent user de ned window query classes and derive a probabilistic model for each of them. For each model, we characterize the e ciency of spatia...