654 search results - page 50 / 131 » Complexity of Answering Queries Using Materialized Views |
161
Voted
SIGMOD
2007
ACM
16 years 3 months ago
2007
ACM
Date's popular critique of SQL's three-valued logic [4, 3] purports to demonstrate that SQL queries can produce erroneous results when nulls are present in the database....
120
Voted
AAAI
2006
15 years 4 months ago
2006
We consider the problem of rewriting a query efficiently using materialized views. In the context of information integration, this problem has received significant attention in th...
208
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Publication
Spatio-temporal data streams that are generated from mobile stream sources (e.g., mobile sensors) experience similar environmental conditions that result in distinct phenomena. Sev...
139
Voted
DOLAP
2003
ACM
15 years 8 months ago
2003
ACM
Data warehouse and Online Analytical Processing(OLAP) play a key role in business intelligent systems. With the increasing amount of spatial data stored in business database, how ...
105
Voted
TREC
2003
15 years 4 months ago
2003
Many researchers have used lexical networks and ontologies to mitigate synonymy and polysemy problems in Question Answering (QA), systems coupled with taggers, query classifiers,...