That's so weird to me, SQL is the very first language they taught me in college 20 years ago, before even learning how to write a for loop in pseudo code. Nowadays it's still the language I use the most on a daily basis.

I learned it ~15 years ago, and when I use it a lot it sticks with my pretty well. But if I go a month or two without writing raw queries I lose anything more advanced than select/update/delete/join. I think I forget it faster than other things because none of syntax/semantics aren't shared with anything else I use.

It's a wide field so it depends on the specialization. I did computer engineering 15+ years ago and we never touched SQL, but I think the software engineering people did have a class on it.