
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: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: ByteScout SQL Trainer is a free web app for learning SQL. It provides a browser-based interface for writing, running, and testing SQL queries on sample databases. The tool is good for beginners learning SQL.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API