PODS
2010
ACM
13 years 4 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...
PODS
2010
ACM
13 years 6 months ago
2010
ACM
Databases in real life are often neither entirely closed-world nor entirely open-world. Indeed, databases in an enterprise are typically partially closed, in which a part of the d...
PODS
2010
ACM
13 years 6 months ago
2010
ACM
Schema mappings are high-level specifications that describe the relationship between two database schemas; they are considered to be the essential building blocks in data exchange...
PODS
2010
ACM
13 years 6 months ago
2010
ACM
PODS
2010
ACM
13 years 6 months ago
2010
ACM
We study highly expressive query languages such as datalog, fixpoint, and while-languages on probabilistic databases. We generalize these languages such that computation steps (e....
PODS
2010
ACM
13 years 9 months ago
2010
ACM
Both semantic and type-based query optimization rely on the idea that queries often exhibit non-trivial rewritings if the state space of the database is restricted. Despite their ...
PODS
2010
ACM
13 years 9 months ago
2010
ACM
PODS
2010
ACM
13 years 9 months ago
2010
ACM
Abiteboul et al. initiated the systematic study of distributed XML documents consisting of several logical parts, possibly located on different machines. The physical distributio...
PODS
2010
ACM
13 years 9 months ago
2010
ACM
PODS
2010
ACM
13 years 9 months ago
2010
ACM
There are major trends to advance the functionality of search engines to a more expressive semantic level. This is enabled by the advent of knowledge-sharing communities such as W...