Online resources to learn SQL

Codecademy

Codecademy helps millions of learners around the world get the skills they need to succeed in today’s digital world -- all in a way that’s fun, free, and accessible anywhere. Codecademy offers an entirely new, networked approach to learning in which you interact with students across the globe, build amazing projects, and - most important - apply your skills to improve your life.

Khan Academy

Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. They tackle math, science, computer programming, history, art history, economics, and more. Their math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. They have also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.