The design of the relational database is one important and inseparable part of the solution development. Those are knowledge and skills which every DB Dev or DB Designer should have. A huge part of the problems in the production sphere is due to a not good base model or to such, which does not scale well. The courses for the design of relational database we offer in SQL Master Academy, are oriented not only to the mastering of the relational model and the good design of the subject filed but also to the mastering of good practices in the modeling of a scalable database.