> You can learn something like ~90% of useful SQL in an afternoon.

It's an ugly little language that one has to come back to and re-learn over and over at different levels of sophistication. Nothing wrong with that, but to suggest it's trivial is a gross mischaracterization.

> different levels of sophistication

Most of those are not necessary for 90% of use cases

I'm not taking the piss either

All most people really need to know is table CRUD, row CRUD, and a bit about indices.

For anything more advanced you'll need a DBA, but IMO you unless you are scaling like crazy you will not need much more than that for SQL knowledge. It's really, really not that complex for most use cases