Rosine Cicchetti

A tool based on a formal approach for object-oriented database modeling and design

A formal approach for object-oriented database modeling and design is presented. It is based on the IFO/sub 2/ model, an extension of the semantic model IFO defined by S. Abiteboul and R. Hull (1987). The approach is illustrated through the mapping formalization of the IFO/sub 2/ model into the O/sub 2/ model. This work, supported by an External European Research Project in collaboration with Digital Equipment Corporation, comes within the scope of a larger project whose aim is to realize a computer aided system for advanced applications modeling and design.

Complex-Statistical-Table Structure and Operators for Macro Statistical Databases

They are two kinds of Statistical DataBases (SDBs), micro and macro-SDBs. Micro-SDBs describe individual entities or events, they are mainly used for statistical analysis. Macro-SDBs contain only summary-data achieved by statistical-mathematical operations on micro-SDBs. In this paper, we propose a data-structure called Complex Statistical Table (CST) which offer a formal and homogeneous framework to develop macro-SDBs. In order to manipulate CST structure, we define two classes of operators : CST transposition operators making data-organisation dynamic and CST retrieval operators that work on CST instances. We also propose a discussion pointing out our approach contrasted with other contributions of this field.

RTL - A Relation and Table Language for Statistical Databases

In this paper, we present a multidimentional data language-RTL (Relation and Table Language) allowing statisticans to handle micro and macro statistical databases. We first describe our data model for statistical applications, based upon a twofold structure : relation and Complex Statistical Table (CST). Then, we present RTL, that encompasses relational algebra with aggregate operator, transformation operators, in order to achieve conversion between relations and CSTs, and specific CST-manipulation operators, allowing to modify CST organization (and making this data-structure dynamic) or to aggregate macro-data.