(a) Consider again Question 3 in Tutorial 1 (Challenge) to find the restaurants that sell all the pizzas that Maggie likes and don’t sell any pizza that Ralph likes. Write a relational algebra ...

Tutorial 3-may2025.pdf Tutorial document describing PL/SQL exercises and learning objectives. Tutorial 5-may2025.pdf Tutorial document with exercises involving functions like calculating total orders ...

Every SQL query you've ever written has a logic layer underneath it—and most people have never seen it. Relational algebra is the mathematical foundation SQL is built on. It's the reason WHY GROUP BY ...

There are two types of relational database manipulation language: procedural and assertional. A procedural language is one in which a query is expressed through a sequence of operations. This category ...

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; ...

Abstract: Query formulation is increasingly performed by systems that need to guess a user's intent (e.g. via spoken word interfaces). But how can a user know that the computational agent is returning ...