373 search results - page 16 / 75 » Querying Priced Information in Databases: The Conjunctive Ca... |
123
click to vote
SDB
1995
15 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...
PODS
2004
ACM
15 years 9 months ago
2004
ACM
We study the problem of answering queries over sources with limited access patterns. Given a first-order query Q, the problem is to decide whether there is an equivalent query whi...
72
Voted
ICDT
1995
ACM
15 years 1 months ago
1995
ACM
Partial information in databases can arise when information from several databases is combined. Even if each database is complete for some \world", the combined databases wil...
CIKM
2001
Springer
15 years 2 months ago
2001
Springer
Query expansion has been shown effective for both single database retrieval and for distributed information retrieval where complete collection information is available. One might...
139
click to vote
EDBT
2008
ACM
15 years 9 months ago
2008
ACM
Data exchange is the problem of transforming data structured under a schema (called source) into data structured under a different schema (called target). The emphasis of data exc...