DBPL
1993
Springer
14 years 4 months ago
1993
Springer
In this paper we study the expressive power of query languages for nested bags. We de ne the ambient bag language by generalizing the constructs of the relational language of Brea...
ICDE
1994
IEEE
14 years 4 months ago
1994
IEEE
The relational data model is based on sets of tuples, i.e. it does not allow duplicate tuples in a relation. Many database languages and systems do require multi-set place, the hi...
PODS
1999
ACM
14 years 4 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...
WEBDB
2005
Springer
14 years 5 months ago
2005
Springer
In the relational model it has been shown that the flat relational algebra has the same expressive power as the nested relational algebra, as far as queries over flat relations ...
PAKDD
2005
ACM
14 years 5 months ago
2005
ACM
Abstract. In this paper we present a novel and general framework based on concepts of relational algebra for kernel-based learning over relational schema. We exploit the notion of ...
OTM
2005
Springer
14 years 5 months ago
2005
Springer
The relational algebra and calculus do not take the semantics of terms into account when answering queries. As a consequence, not all tuples that should be returned in response to ...
ICDT
2007
ACM
14 years 6 months ago
2007
ACM
We introduce a new abstract model of database query processing, finite cursor machines, that incorporates certain data streaming aspects. The model describes quite faithfully what...
ICCSA
2007
Springer
14 years 6 months ago
2007
Springer
Abstract. Relational algebra is one of the main topics covered in undergraduate computer science database courses. In this paper, we present a web-based tool designed to automatica...
DBPL
2007
Springer
14 years 6 months ago
2007
Springer
Annotated relational databases can be queried either by simply making the annotations explicitly available along the ordinary data, or by adapting the standard query operators so ...
IDEAS
2009
IEEE
14 years 7 months ago
2009
IEEE
This paper is concerned with a transformation-based approach to update propagation in an extended version of Codd’s relational algebra which allows for defining derived relatio...