- www.kaggle.com/learn/intro-to-sql
- https://www.datacamp.com/courses/intro-to-sql-for-data-science
- https://www.linkedin.com/learning/sql-essential-training-2/welcome
- https://mode.com/sql-tutorial/introduction-to-sql/
- https://www.w3schools.com/sql/
- https://sqlzoo.net/
- https://lagunita.stanford.edu/courses/DB/SQL/SelfPaced/about