https://sqlbolt.com is great to get acquainted with the basic syntax. Don't make it a challenge though. If you get stuck just check the answer, fill in the answer (muscle memory) and come back later to see if you can remember it. The reason you should be rushing through this fast without any concern whether you understand it or not is because you'll learn SQL faster if you learn it top-down. Which means exploring the problem first, establishing how it needs to be broken down, and then finally at the end enter the syntax. And that's when job interview problems (start anywhere on Youtube) are awesome, they're all derived from real world databases. They all will walk you through this process the right way. People who start trying to get a perfect syntax first will be treading water for a long time before they get to chew on what makes SQL so satisfying to work it. That's what I did and I wish someone had told me this. Instead I had SQL for Dummies starting me out on database sanitation... Answer from Thefriendlyfaceplant on reddit.com