
Description: Practice and Learn SQL is a free, interactive website for learning SQL. It provides a browser-based SQL interface and challenges for writing and running queries on practice datasets.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: PostgreSQL Exercises is an open-source web application that helps users learn SQL and PostgreSQL through interactive exercises and quizzes. It covers basics like SELECT queries as well as more advanced topics like window functions.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API