I just completed the Database courses on CodeSchool.com and have to say they were very enlightening.

The courses include MongoDB, Try SQL, and the course I am reviewing here, The Sequel to SQL.

I would definitely suggest taking the Try SQL course before this one, as it does get rather advanced pretty quickly. Inner Joins, Outer Right Joins, Aliases, and nesting queries are all covered.

The instructor is very thorough and easy to understand. I definitely felt I had a better grasp of the SQL language and its nuances and functionalities after this course.