JOIN excercise added. https://app.bytescout.com/sql-trainer/index.html

No joins? Its a bit trivial then. Otoh, explaining joins is pretty complicated compared to the basics.

This 'Late Payment Email generator' by same person is pretty good : ) I hate figuring out how to write those

https://app.bytescout.com/generate-payment-reminder-email/ge...

Agreed, just add a few more steps to do joins as that's probably one of the most common requests that people need to do. Even providing a few basic inner or left joins could be enough.

joins will be added soon!