What is the modern book to start reading on sql?

Question

MySQL

On the Internet, everyone is inclined to read Gruber, the book is good, but since then there have been many innovations. Therefore, I ask for advice. I would like high-quality, like a grubber, but more modern material, preferably with an emphasis on mysql or postgresql and in Russian, but I’m ready to read it in English if it’s a very good book.

Answer 1

PostgreSQL
postgresql.leopard.in.ua

Answer 2

dev.mysql.com

Answer 3

Great course, whatever you want
https://stepic.org/course/%D0%9F%D0%BE%D0%B3%D1%80...
and of course postgresql.leopard.in.ua