As a developer, you will most likely have done a project, and had to use a relational database. It happens all the time on each project. I think I miss very few relational DBMS (Database Management System) that I haven’t used in my profile as DevOp. This has not been the case for non-relational BBDD or also called NoSQL (Not Only SQL) such as MongoDB. I will explain the differences above and in a future article, we will see their use.