This is a great course if you just want to quickly grasp the basics of databases and SQL statements to the point of saying, "Ah, so that's what this is." While you'll need to study the fine details on your own, this course shows you exactly what and how to study. (For example, it helps beginners identify things they don't understand even after using various commands, or figure out what a "procedure" is... it helps you find your own path for further study.) It packs more information than expected into a short, intensive format. Considering the Notion summary materials and the fact that it's free, I think it's a truly excellent course!