654 search results - page 36 / 131 » Complexity of Answering Queries Using Materialized Views |
VLDB
1994
ACM
14 years 17 days ago
1994
ACM
This paper introduces a formalism to describe the needs and preferences of database users. Because of the precise formulation of these concepts, we have found an automatic and ver...
PODS
2008
ACM
14 years 8 months ago
2008
ACM
Data exchange, also known as data translation, has been extensively investigated in recent years. One main direction of research has focused on the semantics and the complexity of...
IR
2006
13 years 8 months ago
2006
In this paper we describe and evaluate a Question Answering (QA) system that goes beyond answering factoid questions. Our approach to QA assumes no restrictions on the type of que...
SIGMOD
1999
ACM
14 years 24 days ago
1999
ACM
In large data warehousing environments, it is often advantageous to provide fast, approximate answers to complex aggregate queries based on statistical summaries of the full data....
ECCC
2010
13 years 8 months ago
2010
An errorless circuit for a boolean function is one that outputs the correct answer or "don't know" on each input (and never outputs the wrong answer). The goal of e...