[agumonkey]

To me the most difficult part is learning sql before knowing what can be done with a computer, both on the complexity and the language design part.

Before learning interpreters/compilers/prolog, I'd spend a lot of time trying to figure out about naming/namespaces in queries, while after doing some PLT, it all becomes very very obvious, you can now focus on the operators and since you'd know how far can programming go, you'd see faster how nested queries could make sense, what aggregating functions meants etc