Since I am going to TA an intro to databases class soon I might very well use it. Why not try to integrate it into a wikibook so that other people can contribute and extend it?

I've been looking for something to get me started on SQL. I'll give this a read and provide a more detailed comment as I finish it.

Direct link to PDF download in case of downtime: http://www.filedropper.com/aprimeronsql1sted