4397 search results - page 91 / 880 » Relational Algebra Operations |
SDB
1995
14 years 1 months ago
1995
Most of work on partial information in databases asks which operations of standard languages, like relational algebra, can still be performed correctly in the presence of nulls. In...
ACSD
2006
IEEE
14 years 4 months ago
2006
IEEE
In this paper, we show how to obtain causal semantics distinguishing ”earlier than” and ”not later than” causality between events from algebraic semantics of Petri nets. J...
DEXAW
1999
IEEE
14 years 2 months ago
1999
IEEE
This paper describes an algebra for use with parallel object databases, and in particular ODMG compliant databases with OQL. Although there have been many proposals for parallel r...
ENTCS
2006
13 years 10 months ago
2006
This is an extended version of an essay with the same title that I wrote for the workshop Algebraic Process Calculi: The First Twenty Five Years and Beyond, held in Bertinoro, Ita...
SP
1991
IEEE
14 years 1 months ago
1991
IEEE
In this paper we give a new decomposition algorithm that breaks a multilevel relation into single-level relations and a new recovery algorithmwhich reconstructs the original multi...