Some other similar tools I added to my notes from a similar thread: https://news.ycombinator.com/item?id=17905666

Interactive PostgreSQL SQL Tutorial - https://chartio.com/learn/sql/

Select STAR SQL - https://selectstarsql.com/

SQL Bolt - https://sqlbolt.com/ - Learn SQL with simple, interactive exercises

SQL Window functions - https://www.windowfunctions.com/

PostgreSQL Exercises - https://pgexercises.com/

SQL Zoo - http://sqlzoo.net/

SQL Teaching - https://www.sqlteaching.com/