Abstract: This paper presents rough SQL, which is a prototype, based on an extension of the SQL algebra by introducing concepts approximation operators. This extension uses mainly the lower and the ...

Abstract: In this paper, we present a translator from a relevant subset of SQL into relational algebra. The translation is syntax-directed, with translation rules associated with grammar productions; ...

Linear algebra operations are at the core of machine learning. Multiple specialized systems have emerged for the scalable, distributed execution of matrix and vector operations. The relationship of ...

Lecture notes from Stanford professor Jennifer Widom's online mini-courses about relational algebra and SQL. The notes were made in Jupyter running a Python 2 kernel with SQL magic. Code cells view ...