https://learnsql.com/blog/sql-for-data-analysis-cheat-sheet/
https://m.youtube.com/watch?v=GEBzsz8ZSXs&pp=ygUdc3FsIGRhdGEgYW5hbHlzaXMgY2hlYXQgc2hlZXQ%3D
https://m.youtube.com/playlist?list=PLUaB-1hjhk8FE_XZ87vPPSfHqb6OcM0cF