2574 search results - page 7 / 515 » Typed Query Languages for Databases Containing Queries |
PODS
1999
ACM
14 years 28 days ago
1999
ACM
Semistructured data occur in situations where information lacks a homogeneous structure and is incomplete. Yet, up to now the incompleteness of information has not been re ected b...
PODS
2007
ACM
14 years 8 months ago
2007
ACM
Query containment has been studied extensively for fragments of
ICDT
2007
ACM
14 years 2 months ago
2007
ACM
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
VLDB
1991
ACM
14 years 3 days ago
1991
ACM
We explore the implications of supporting bags (i.e. multisets) in a data model and associated query language, and present some formal results concerned with the algebraic propert...
XSYM
2005
Springer
14 years 2 months ago
2005
Springer
Among various proposals for primitives for deconstructing XML data two approaches seem to clearly stem from practise: path expressions, widely adopted by the database community, an...