resources https://www.codecademy.com/learn/learn-sql https://www.khanacademy.org/computing/computer-programming/sql http://sqlzoo.net/wiki/SQL_Tutorial https://blog.jooq.org/2016/03/17/10-easy-steps-to-a-complete-understanding-of-sql/ http://www.sohamkamani.com/blog/2016/07/07/a-beginners-guide-to-sql/