Why SQL is not supported in challenges ?

Question

sql , css and other courses

Answer 1

https://www.sololearn.com/Discuss/1033817/?ref=app
https://www.sololearn.com/discuss/979009/?ref=app
https://www.sololearn.com/discuss/988136/?ref=app
https://www.sololearn.com/discuss/690768/?ref=app
https://www.sololearn.com/discuss/759417/?ref=app
https://www.sololearn.com/discuss/870238/?ref=app
https://www.sololearn.com/discuss/687094/?ref=app