Don't know why there is No challenge section for query language(SQL) in sololearn

Answer 1

i also want sql challenges

Answer 2

SQL is just so general and it gets encapsulated in all languages.
Jquery is just a subsection of Javascript.
Swift needs challenges, though.

Answer 3

agreed, and php, but there's a lot of languages I'd like to see support for (perl pops to mind), i guess just need to request and wait