On: SQLBolt – Interactive lessons and exercises to lea...

[sandGorgon]

One of the best paid courses here (if u want to train interns in ur co) is

https://www.udemy.com/course/postgresqlmasterclass/ (created by Adnan Waheed - Founder of KlickAnalytics)

https://www.udemy.com/course/postgresql-from-zero-to-hero/ (created by Will Bunker - founder of Match.com)

Not too expensive ..but very very good.