I've found the Mode Analytics course to be quite useful : https://community.modeanalytics.com/sql/tutorial/introduction-to-sql/ https://community.modeanalytics.

I've found the Mode Analytics course to be quite useful : https://community.modeanalytics.com/sql/tutorial/introduction-to-sql/ https://community.modeanalytics.com/sql/tutorial/introductio... The HackerRank SQL challenges were also helpful in getting some extra practice: https://www.hackerrank.com/domains/sql/ https://www.hackerrank.com/domains/sql/ Finally, this Quora post will also point you to some useful resources and has some great tips that I'm working through now: https://www.quora.com/How-do-I-learn-SQL https://www.quora.com/How-do-I-learn-SQL