This is very smart. Also a very good choice of language. Reminds me of a comment from a few days ago https://news.ycombinator.com/item?id=18144385

I too looked at the comment and thought, yes it’s about time to get my SQL act together. I can write sql queries, and can also understand looking at them what they supposedly do, but my day job doesn’t really demand more than a simple select on two tables. Where can I go learn/explore more competitive SQL?

Really good introduction to some of the more "modern" features: https://modern-sql.com/

this is an amazing resource http://selectstarsql.com/

The timing of your comment couldn't be better.

Only yesterday I kinda messed up in an interview because I wasn't good at SQL. Just cursorily checked the link you posted and it is looking good. Thanks for the suggestion.

Can you remember the questions? I think that I'm relatively good with SQL, but I just realized, I have never been asked any SQL specific questions, even though most of my work has been tied to it. The questions usually revolve around specifics of the engine, not query language itself.

I think that was a smart choice too. It's good that they could see through all the hype with the more recent languages and pick SQL. interesting choice indeed. Not sure how it scales though.