But as my career has gone forward, I'm touching it less and less; today, I hardly touch it at all outside of my personal usage.
Much of that has to do with the fact that I'm now employed building and maintaining an SPA using javascript and nodejs where the backend is accessed thru a RESTful API; we never get to touch the actual database.
The few times I have seen some queries for that DB - albeit not in our API, though I could probably find them somewhere - all I can hope is that the SQL engine being used does some kind of query optimization on-the-fly, because there's so many inner selects that make me cringe it ain't funny (like I wonder if they've heard of joins and such).
Before, I was involved in a lot of PHP web apps and backend server automation, where I needed to use SQL a lot; I feel like I am getting rusty in it.
Unfortunately the vast majority of SQL users aren't that proficient. It's also fairly hard to learn because it's something that you only pick up with experience and specifically longer time experience with a sufficiently complex data model.
I personally would never have gotten good at SQL if I hadn't stayed in my first two jobs for 5 years each working daily with the data-models and the domain.