SQL is called relational because it's based on relational algebra [1]. Although in practice it only loosely follows that theory. [1] https://en.m.wikipedia.org

SQL is called relational because it's based on relational algebra [1]. Although in practice it only loosely follows that theory. [1] https://en.m.wikipedia.org/wiki/Relational_algebra https://en.m.wikipedia.org/wiki/Relational_algebra