Nice concept but I really hate clicking on the buttons to form my statements... Is it possible to allow typing? Also, not ending my statement with a semicolon feels incomplete.
You could do it the way Duolingo does it - on desktop, it allows for "Hard Mode", where it lets you type the responses freely. On mobile however, it doesn't let you do that (unless you're using the app).
"Although the semicolon isn't required for most statements in this version of SQL Server, it will be required in a future version."