5 Jul 2022 Jakub Romanowski Free Course of the Month – Writing User-Defined Functions in PostgreSQL Why learn to write user-defined functions? I’ll explain in this article – and how you can learn for free during July 2022 with this LearnSQL.com PostgreSQL course! PostgreSQL is one of the most popular databases in the world. This is mainly due to its great functionality and the fact that it’s open source (i.e. free!). Postgres is fast, it runs on multiple systems, and it’s suitable for almost any application. Read more