201 search results - page 2 / 41 » Extending the Relational Algebra to Capture Complex Objects |
LICS
2002
IEEE
13 years 10 months ago
2002
IEEE
We study relations on trees defined by first-order constraints over a vocabulary that includes the tree extension relation Ì Ì ¼, holding if and only if every branch of Ì ex...
SIGMOD
2005
ACM
14 years 5 months ago
2005
ACM
This paper introduces RankSQL, a system that provides a systematic and principled framework to support efficient evaluations of ranking (top-k) queries in relational database syst...
WADT
1998
Springer
13 years 9 months ago
1998
Springer
Abstract. Hidden algebra is a behavioural algebraic specification formalism for objects. It captures their constructional aspect, concerned with the initialisation and evolution of...
VLDB
1992
ACM
13 years 9 months ago
1992
ACM
Research in temporal databases has mainly focused on defining temporal data models by extending existing models, and developing access structures for temporal data. Little has bee...
ICCD
2005
IEEE
14 years 2 months ago
2005
IEEE
In this paper, we make two major contributions: First, to enhance Boolean learning, we propose a new class of logic implications called extended forward implications. Using a nove...