Learn SQL Interactively on Khan Academy
We also have an interactive online SQL course at CodeHS (completely client side as well). You can check it out at <a href="https://codehs.com/sql" rel="nofollow">https://codehs.com/sql</a> or try out the first hour free at <a href="https://codehs.com/hoc" rel="nofollow">https://codehs.com/hoc</a>