Add SQL cheatsheet (#5623)

* Update free-programming-cheatsheets.md * Update free-programming-cheatsheets.md * Update free-programming-cheatsheets.md

Add SQL cheatsheet (#5623)
* Update free-programming-cheatsheets.md * Update free-programming-cheatsheets.md * Update free-programming-cheatsheets.md
930d6f9e · Eugene Goh · GitHub · 51767bb8 · 930d6f9e
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more/free-programming-cheatsheets.md more/free-programming-cheatsheets.md +1 -0

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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)