[mettamage]

Reporting for duty. I never feared SQL after https://www.sqlteaching.com/

Granted, there's much more to learn than that, but so is the case with ORMs. I've had more issues writing good ORM queries than SQL queries.

[lawrencechen]

Great (and fun!) resource. https://pgexercises.com/ for more in depth on aggregates + recursion.