1 citations · 1 across the 9 of their papers we have counts for
6 papers · 1 filter
Tree Databases
Nicolas Spyratos
We propose a novel database model whose basic structure is a labeled, directed tree with node identities. Intuitively, the root of the tree is seen as an object (or entity), the no…
A Chase-based Approach to Consistent Answers of Analytic Queries in Star Schemas
Dominique Laurent, Nicolas Spyratos
We present an approach to computing consistent answers to queries possibly involving an aggregation operator in databases operating under a star schema and possibly containing miss…
The Context Model: A Graph Database Model
Nicolas Spyratos
We propose a novel database model whose basic structure is a labeled, directed, acyclic graph with a single root, in which the nodes represent the data sets of an application and t…
Consistent Query Answering without Repairs in Tables with Nulls and Functional Dependencies
Dominique Laurent, Nicolas Spyratos
In this paper, we study consistent query answering in tables with nulls and functional dependencies. Given such a table T, we consider the set Tuples of all tuples that can be buil…
Four-Valued Semantics for Deductive Databases
Dominique Laurent, Nicolas Spyratos
In this paper, we introduce a novel approach to deductive databases meant to take into account the needs of current applications in the area of data integration. To this end, we ex…
Handling Inconsistencies in Tables with Nulls and Functional Dependencies
Dominique Laurent, Nicolas Spyratos
In this paper we address the problem of handling inconsistencies in tables with missing values (also called nulls) and functional dependencies. Although the traditional view is tha…