Relational Algebra and TeamSQL
In this article about Algebra Relational, we will cover a very rare in SQL operation called division. This operator has not an equivalent implementation in SQL. However, there is a technique to implement division in SQL, and we will explain here.
Relational Algebra: Division, what is it?
As any other algebra, relational algebra has operations (like addition subtraction multiplication division in numeric algebra). The fundamental operations are Selection and Projection. We will base ...