No, there isn't. But I don't see the need to start with these commands anyway. Or if the OP really feels like that's a necessary starting point, it would be great to have an option in the future to select what DBMS you're using. I wasn't intending to bash the work, but sticking to a single DBMS really limits the utility of what seems like it could be very general resource.
I like the idea of being able to select which dialect one wants to learn and maybe a table listing the most prominent differences (like LIMIT vs. TOP) at the end, would be nice too.
