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» On the Complexity of Theory Curbing
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PODS
2003
ACM
114views Database» more  PODS 2003»
14 years 8 months ago
An information-theoretic approach to normal forms for relational and XML data
Normalization as a way of producing good database designs is a well-understood topic. However, the same problem of distinguishing well-designed databases from poorly designed ones...
Marcelo Arenas, Leonid Libkin
PODS
2006
ACM
134views Database» more  PODS 2006»
14 years 8 months ago
Approximate quantiles and the order of the stream
Recently, there has been an increased focus on modeling uncertainty by distributions. Suppose we wish to compute a function of a stream whose elements are samples drawn independen...
Sudipto Guha, Andrew McGregor
PODS
2007
ACM
104views Database» more  PODS 2007»
14 years 8 months ago
XML transformation by tree-walking transducers with invisible pebbles
The pebble tree automaton and the pebble tree transducer are enhanced by additionally allowing an unbounded number of `invisible' pebbles (as opposed to the usual `visible�...
Joost Engelfriet, Hendrik Jan Hoogeboom, Bart Samw...
PODS
2008
ACM
123views Database» more  PODS 2008»
14 years 8 months ago
Evaluating rank joins with optimal cost
In the rank join problem, we are given a set of relations and a scoring function, and the goal is to return the join results with the top K scores. It is often the case in practic...
Karl Schnaitter, Neoklis Polyzotis
PODS
2008
ACM
250views Database» more  PODS 2008»
14 years 8 months ago
Approximating predicates and expressive queries on probabilistic databases
We study complexity and approximation of queries in an expressive query language for probabilistic databases. The language studied supports the compositional use of confidence com...
Christoph Koch