"Understood" is a strong word. There are lots of people with a basic understanding of SQL but who can't write complex queries to do things like represent tree s

"Understood" is a strong word. There are lots of people with a basic understanding of SQL but who can't write complex queries to do things like represent tree structures and cyclic relationships. I don't think your average analyst can do that. And even if all the analysts in the world could do such a thing, that doesn't matter if they're not building the applications.