100 search results - page 1 / 20 » Estimating Null Values In Relational Database Systems Based ... |
CAS
2005
13 years 4 months ago
2005
In this paper, we present a new method to estimate null values in relational database systems based on genetic algorithms. It can tune the membership functions of the linguistic v...
PODS
2010
ACM
13 years 5 months ago
2010
ACM
We study functional and multivalued dependencies over SQL tables with NOT NULL constraints. Under a no-information interpretation of null values we develop tools for reasoning. We...
CATS
2006
13 years 6 months ago
2006
The implication of multivalued dependencies (MVDs) in relational databases has originally been defined in the context of some fixed finite universe (Fagin 1977, Zaniolo 1976). Whi...
VLDB
1987
ACM
13 years 8 months ago
1987
ACM
A model for a historical database is described which is based upon time-stamped tuples as the unit of storage. The model includes both physical and logical time-stamps. The techni...
CIKM
2010
Springer
13 years 2 months ago
2010
Springer
This paper proposes a ranking method to exploit statistical correlations among pairs of attribute values in relational databases. For a given query, the correlations of the query ...