A free app for Android, by TechNark.
SQL For Beginners is an app that teaches you the basics of designing a database, and the SQL language. The app is designed in a way that even if you are a beginner, you can easily understand the concepts. The topics are well-structured and easy to follow. You can use this app even if you do not have any prior knowledge of SQL language.
In this app, you will be able to learn how to create a database, how to design a table, how to create a view, how to use the aggregate function, and many more. You will be able to see the output of each query, and you will be able to use the results in your own projects.