SQL web interface for your own data?

I'm writing a SQL tutorial for a bunch of marketing friends. I'd like for them to code as they go.

They've told me that I'll lose them if I ask them to set up SQLite, MySQL, etc. on their laptops. So, I’d like to use a web-based interactive console like that on W3schools (http://www.w3schools.com/sql/trysql.asp?filename=trysql_select_all) with my own data. Basically load up some tables and point the users to the interface. Is anyone aware of this functionality or how to roll our own?

Thank you.