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ICDE
2003
IEEE
117views Database» more  ICDE 2003»
16 years 5 months ago
Design and Implementation of a Temporal Extension of SQL
We present a valid-time extension of SQL and investigate its efficient implementation on an Object-Relational database system. We propose an approach where temporal queries are ex...
Cindy Xinmin Chen, Jiejun Kong, Carlo Zaniolo
DEXA
1995
Springer
125views Database» more  DEXA 1995»
15 years 8 months ago
An SQL Extension Supporting User Viewpoints
- In order to accomplish independence on the logical data organization, a relational DBMS must be capable of interpreting query language sentences which reference attributes belong...
Giuseppe Bellavia, Dario Maio, Stefano Rizzi
JSC
2010
135views more  JSC 2010»
15 years 2 months ago
Deciding inseparability and conservative extensions in the description logic EL
We study the problem of deciding whether two ontologies are inseparable w.r.t. a signature Σ, i.e., whether they have the same consequences in the signature Σ. A special case is...
Carsten Lutz, Frank Wolter
VLDB
1993
ACM
99views Database» more  VLDB 1993»
15 years 8 months ago
Control of an Extensible Query Optimizer: A Planning-Based Approach
III this paper we address the problem of controlling the execution of a query optimizer. We describe a control for the optimization process that is based on planning. The controll...
Gail Mitchell, Umeshwar Dayal, Stanley B. Zdonik
CCCG
2009
15 years 5 months ago
Data Structures for Reporting Extension Violations in a Query Range
Design Rule Checking (DRC) in VLSI design involves checking if a given VLSI layout satisfies a given set of rules, and reporting the violations if any. We propose data structures ...
Ananda Swarup Das, Prosenjit Gupta, Kannan Srinath...