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» A study of query length
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CDB
2004
Springer
169views Database» more  CDB 2004»
14 years 1 months ago
Semantic Optimization of Preference Queries
Preference queries are relational algebra or SQL queries that contain occurrences of the winnow operator (find the most preferred tuples in a given relation). We present here a nu...
Jan Chomicki
DAWAK
2004
Springer
13 years 11 months ago
Space-Efficient Range-Sum Queries in OLAP
Abstract. In this paper, we present a fast algorithm to answer rangesum queries in OLAP data cubes. Our algorithm supports constanttime queries while maintaining sub-linear time up...
Fredrik Bengtsson, Jingsen Chen
ICASSP
2011
IEEE
12 years 11 months ago
Location-aware query parsing for mobile voice search
Mobile voice search provides users an easier way to search for information using voice from mobile devices. Most mobile search applications have access to the latitude/longitude c...
Junlan Feng
WWW
2007
ACM
14 years 8 months ago
Exploit sequencing views in semantic cache to accelerate xpath query evaluation
In XML databases, materializing queries and their results into views in a semantic cache can improve the performance of query evaluation by reducing computational complexity and I...
Jianhua Feng, Na Ta, Yong Zhang, Guoliang Li
VLDB
2006
ACM
147views Database» more  VLDB 2006»
14 years 8 months ago
Answering queries using materialized views with minimum size
In this paper we study the following problem. Given a database and a set of queries, we want to find a set of views that can compute the answers to the queries, such that the amoun...
Rada Chirkova, Chen Li, Jia Li