111 search results - page 15 / 23 » Incomplete Information in Relational Temporal Databases |
ACM
1995
14 years 6 days ago
1995
We study properties of rough sets, that is, approximations to sets of records in a database or, more formally, to subsets of the universe of an information system. A rough set is a...
ACSC
2007
IEEE
14 years 3 months ago
2007
IEEE
Full hierarchical dependencies (FHDs) constitute a large class of relational dependencies. A relation exhibits an FHD precisely when it can be decomposed into at least two of its ...
ICALP
1998
Springer
14 years 7 days ago
1998
Springer
An architecture is described for designing systems that acquire and manipulate large amounts of unsystematized, or so-called commonsense, knowledge. Its aim is to exploit to the fu...
BTW
2005
Springer
14 years 2 months ago
2005
Springer
Abstract: Peer data management systems (PDMS) are the natural extension of integrated information systems. Conventionally, a single integrating system manages an integrated schema,...
TIME
2005
IEEE
14 years 2 months ago
2005
IEEE
Historical information can be effectively preserved using XML and searched through powerful historical queries written in XQuery. Indeed, by storing the successive versions of a d...