In some respects that's true, though the docs do contain a lot of patient explanation at a pretty basic level. I wouldn't exactly call it a tutorial but it did

In some respects that's true, though the docs do contain a lot of patient explanation at a pretty basic level. I wouldn't exactly call it a tutorial but it did teach me a great deal about SQL when I started using the db > 15 years ago. New standards and features have made the program more complicated over time, so periodically I need to study up on these topics. More than a few times, it's been really useful to have that "beginner level" info re: stuff that's new to me. But like you say, not all subjects are covered that way, perhaps they haven't been considered to be basic. I bet if there are enough requests the project would improve the documentation in those areas.