Where can I practice sql queries?

Question

SQL

You can link to some sites where you can practice more or less complex sql queries (joins, group by), preferably with ready-made data.

Answer 1

www.sql-ex.ru

Answer 2

And what prevents you from downloading and installing some kind of DBMS on your computer and practicing there?
For example:
PostgreSQL
SQLite
MySQL
In addition, there is documentation available on off-sites