https://learnsql.com/
https://learnsql.com/cookbook/

https://learnsql.com/tags/cheat-sheet/
https://learnsql.com/blog/ultimate-sql-cheat-sheet/
https://learnsql.com/blog/sql-basics-cheat-sheet/
https://learnsql.com/blog/standard-sql-functions-cheat-sheet/
https://learnsql.com/blog/sql-window-functions-cheat-sheet/

https://www.dataquest.io/cheat-sheet/sql-cheat-sheet/

2022
https://proglib.io/p/osnovnye-sql-komandy-i-zaprosy-s-primerami-kotorye-dolzhen-znat-kazhdyy-razrabotchik-2022-04-14
https://proglib.tech/p/osnovnye-sql-komandy-i-zaprosy-s-primerami-kotorye-dolzhen-znat-kazhdyy-razrabotchik-2022-04-14