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» Similarity of Cardinal Directions
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SIGMOD
2004
ACM
140views Database» more  SIGMOD 2004»
14 years 7 months ago
Automatic Direct and Indirect Schema Mapping: Experiences and Lessons Learned
A schema mapping produces a semantic correspondence between two schemas. Automating schema mapping is challenging. The existence of 1:n (or n:1) and n:m mapping cardinalities make...
David W. Embley, Li Xu, Yihong Ding
BTW
2009
Springer
132views Database» more  BTW 2009»
14 years 5 days ago
A Bayesian Approach to Estimating the Selectivity of Conjunctive Predicates
: Cost-based optimizers in relational databases make use of data statistics to estimate intermediate result cardinalities. Those cardinalities are needed to estimate access plan co...
M. Heimel, Volker Markl, Keshava Murthy
SIGMOD
2004
ACM
142views Database» more  SIGMOD 2004»
14 years 7 months ago
Conditional Selectivity for Statistics on Query Expressions
Cardinality estimation during query optimization relies on simplifying assumptions that usually do not hold in practice. To diminish the impact of inaccurate estimates during opti...
Nicolas Bruno, Surajit Chaudhuri
EUSFLAT
2001
13 years 9 months ago
Similarity measurement on leaf-labelled trees
We outline a method for measuring in an efficient way an overall degree of similarity between different leaf-labelled trees. In particular, we consider rooted trees, either unorde...
Hans De Meyer, Bernard De Baets, Saskia Janssens
CVPR
2008
IEEE
13 years 7 months ago
A similarity measure between unordered vector sets with application to image categorization
We present a novel approach to compute the similarity between two unordered variable-sized vector sets. To solve this problem, several authors have proposed to model each vector s...
Yan Liu, Florent Perronnin