I did not see anything when I started putting it together, but I already had a number of datasets that I put together for illustrating specific points. My favorite is a list of pairs of airport codes and the distances between them. This is a simple table, but students can have a lot of fun with a challenge like "Be the worst possible travel agent you can be. Find an itinerary from NYC to CDG, with a maximum of four stops, that will cover the most miles." Hilarity ensues as we look at the result, but it is challenging enough for beginners learning about joins, etc.
The other great thing about this type of setup is that students can feel free to experiment with deleting records and doing all kinds of things in SQL knowing that they can immediately restore everything to the initial state by hitting refresh.
The last component that I think helped the class was adding an anonymous "share" button that allowed students in the class to submit the contents of their editor so that I could run it for the whole class and we could talk about the trade-offs of different approaches.
The other great thing about this type of setup is that students can feel free to experiment with deleting records and doing all kinds of things in SQL knowing that they can immediately restore everything to the initial state by hitting refresh.
The last component that I think helped the class was adding an anonymous "share" button that allowed students in the class to submit the contents of their editor so that I could run it for the whole class and we could talk about the trade-offs of different approaches.