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PVLDB
2010
146views more  PVLDB 2010»
15 years 1 months ago
Generating Efficient Execution Plans for Vertically Partitioned XML Databases
Experience with relational systems has shown that distribution is an effective way of improving the scalability of query evaluation. In this paper, we show how distributed query e...
Patrick Kling, M. Tamer Özsu, Khuzaima Daudje...
SIGMOD
2008
ACM
188views Database» more  SIGMOD 2008»
16 years 6 months ago
HERMES: aggregative LBS via a trajectory DB engine
We present HERMES, a prototype system based on a powerful query language for trajectory databases, which enables the support of aggregative Location-Based Services (LBS). The key ...
Nikos Pelekis, Elias Frentzos, Nikos Giatrakos, Ya...
PODS
2006
ACM
177views Database» more  PODS 2006»
16 years 6 months ago
Equivalence of queries combining set and bag-set semantics
The query equivalence problem has been studied extensively for set-semantics and, more recently, for bag-set semantics. However, SQL queries often combine set and bag-set semantic...
Sara Cohen
ICDT
1997
ACM
95views Database» more  ICDT 1997»
15 years 10 months ago
Type-Consistency Problems for Queries in Object-Oriented Databases
Abstract Method invocation mechanism is one of the essential features in objectoriented programming languages. This mechanism contributes to data encapsulation and code reuse, but ...
Yasunori Ishihara, Hiroyuki Seki, Minoru Ito
SIGMOD
1998
ACM
180views Database» more  SIGMOD 1998»
15 years 10 months ago
Integration of Heterogeneous Databases Without Common Domains Using Queries Based on Textual Similarity
Most databases contain “name constants” like course numbers, personal names, and place names that correspond to entities in the real world. Previous work in integration of het...
William W. Cohen