Most applications, at some point, need to persist data. This can be through files, local storage, cloud services, or often databases. Relational database systems are usually a good default choice, particularly PostgreSQL, which is a very powerful open source SQL server.
Some companies have resources to organize their own dedicated database team. If you are lucky enough to work in such a company, they will probably craft all of their stored procedures inside their databases. So, you will only have to use the language of your choice – NodeJS or Python – to call these stored procedures. In practice, this might not occur very often, and the truth is that many developers, or even so-called full stack developers, know very little about SQL and will seek out various abstractions in their favorite package repository.
