SQLZOO is described as 'SQLZoo includes tutorials and reference to support people learning SQL. It features:' and is an website in the Development category. There are more than 25 alternatives to SQLZOO, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Mac. The best alternative is freeCodeCamp, which is both free and Open Source. Other great sites and apps similar to SQLZOO are Codecademy (Freemium), W3Schools (Free), tutorialspoint (Free) and Code.org (Free).
Code.org is a non-profit whose goal is to expose all students to computer programming. We believe that computer programming is a liberal art; it's something EVERY student in the world should be exposed to at some point in their childhood education.
Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your algorithmic thought process on any problem you want at anytime.