Hello Codeforces, Hackerrank has some nice collection of SQL problems which helps in understanding the use of different clauses in SQL . Having Video editorials will help people understand better . Here is the link of playlist(incomplete) I made on the youtube . Looking forward to read corrections/feedback/better solutions in the comment section. Also I solved them in mysql in videos.

Youtube Playlist Link : https://youtube.com/playlist?list=PLNxnXBCRbAFHA2-a6cc5ls4JfjMglsADT