62 search results - page 5 / 13 » Containment of Conjunctive Queries over Databases with Null ... |
PVLDB
2010
13 years 5 months ago
2010
Keyword search over entity databases (e.g., product, movie databases) is an important problem. Current techniques for keyword search on databases may often return incomplete and i...
BTW
2009
Springer
13 years 11 months ago
2009
Springer
: Cost-based optimizers in relational databases make use of data statistics to estimate intermediate result cardinalities. Those cardinalities are needed to estimate access plan co...
TIME
2003
IEEE
14 years 6 days ago
2003
IEEE
In bitemporal databases, current facts and transaction states are modelled using a special value to represent the current time (such as a minimum or maximum timestamp or NULL). Pr...
ICDT
2001
ACM
13 years 11 months ago
2001
ACM
In fast OLAP applications it is often advantageous to provide approximate answers to range queries in order to achieve very high performances. A possible solution is to inquire sum...
ADBIS
2004
Springer
14 years 11 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...