Why are there no SQL challenges?

Question

Sololearn could give the database structure and either given an answer and ask for the corresponding SQL query or give the query and ask what it should return, isn't it?

Answer 1

@Joseph: thanks for the link but I don't agree with the answer given. To answer a SQL question you just need the structure of a database, not the contents.
So it would be doable, for the same reason that SQL exams exist IRL

Answer 2

See this

https://code.sololearn.com/W7X805sc4DPC/?ref=app

Answer 3

Without having data to pull it is hard to simply visulize.

Answer 4

i think its because its an database