9 search results - page 2 / 2 » Semantically Correct Query Answers in the Presence of Null V... |
SDB
1995
13 years 11 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...
IS
2008
13 years 7 months ago
2008
Consistent query answering is the problem of characterizing and computing the semantically correct answers to queries from a database that may not satisfy certain integrity constr...
VLDB
2007
ACM
14 years 1 months ago
2007
ACM
This paper reports our first set of results on managing uncertainty in data integration. We posit that data-integration systems need to handle uncertainty at three levels, and do...
ADBIS
2004
Springer
14 years 27 days ago
2004
Springer
Repairing a database means making the database consistent by applying changes that are as small as possible. Nearly all approaches to repairing have assumed deletions and insertion...