Thanks to Hacker News for the feedback I received earlier! I have been able to incorporate many of your ideas, and still look forward to hearing more.

Also, a shout out to mrpollo (http://news.ycombinator.com/user?id=mrpollo) who helped me with the redesigned UI, after seeing the first post here on Hacker News. Thanks Ramon!

Very cool. Tools like this are unbelievably useful for self-study, as they allow for quick experimentation. Which (at least in my case) helps cement new concepts.

Another, similar tool is jsFiddle (http://jsfiddle.net/).

Anyone know of any others like this?

There is also : - http://rubyfiddle.com/ - http://pythonfiddle.com/

and http://repl.it/#:languages

Very nice! And very happy people are finding sql.js useful. Let me know if there are any improvements that would be useful for this project (or others).

Thanks for your work, azakai! I was very pleased when I learned about it. A perfect fit for my site, and a cool way of implementing a new "back"-end.

1st, I agree. It's awesome!!

2nd, it was a bit confusing at first not having to 'create' a database and instead jumping right into commands. Maybe add this note somewhere for clarification? It was just a bit of a dummy moment when the very first thing that happens is you run a create command, and then are looking at an error message.

Good point. I plan on building some help tips that explain how it works a bit better (beyond simply the examples which I have now) and that sounds like something worth including.

Might want to add a mobile specific stylesheet.. But otherwise looks awesome

Nice work, will definitely use this with my students.

It's awesome!!