One of the my best friend asked me, what's the best free online tool for self-learning SQL??
There's a giant market popping up for this kind of things but for a newer, it's difficult to identify which resources are best to learn SQL easily. So I felt it would be best to gather up some resources that would help him(my friend) running in the right direction.
Here are some excellent resources to learn SQL online, hope can help you too:
- Stanford - Introduction to Databases (Coursera)
- SQL exercises
- Database eLearning
- PostgreSQL tutorial
- PostgreSQL exercises
- The Schemaverse is a game, I never played it so I can't tell much
- Sams Teach Yourself SQL in 10 Minutes
- Learn SQL The hardway - I like this text book a lot.
If I forgot to add any useful link/resource, than mention in comment.