Literature on mongodb/mysql/postgresql?

Question

Database

At the university, I did labs on mysql, but nothing went beyond simple triggers and procedures. Now I want to fully study the creation of a database, preferably both relational and non-relational. Can you suggest relevant literature?

Answer 1

No one will embrace the immensity.
Start, for example, with an RDBMS.
Then learn NoSQL.
It is possible and vice versa.
But not at the same time.
For the RDBMS , the classic