In this paper, the authors describe a custom relational algebra query software environment that enables database instructors to teach relational algebra programming. Instead of defining query ...

Abstract: In the paper, we introduce bag relational algebra with grouping and aggregation overa particular representation of incomplete information called c-tables, which wasfirst introduced byGrahne ...

We discuss an integer linear programming modeling system based on relational algebra. In this system, all modeling related activities, such as model formulation, model instantiation, and model and ...