Add SQL cheatsheet (#5623)

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md

* Update free-programming-cheatsheets.md
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Eugene Goh 2021-10-01 22:57:40 +08:00 committed by GitHub
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* [MySQL Cheatsheet](https://s3-us-west-2.amazonaws.com/dbshostedfiles/dbs/sql_cheat_sheet_mysql.pdf) - Database Star (PDF)
* [PostgreSQL Cheatsheet](https://s3-us-west-2.amazonaws.com/dbshostedfiles/dbs/sql_cheat_sheet_pgsql.pdf) - Database Star (PDF)
* [SQL Cheatsheet](https://www.codecademy.com/learn/learn-sql/modules/learn-sql-manipulation/cheatsheet) - Codecademy (SQL)