Checked my email and saw that Josh McCadams posted his logic programming interview with me. Unless you're really interested in logic programming, I recommend you steer clear. Nothing I say will make a lick of sense.
As a side note, if you do listen and you heard me say that I only knew of one "relational database" (things like PostgreSQL, MySQL, Oracle, SQL Server, etc., are not relational), gorthx sent me information about other open-source relational databases and I wrote a bit about relational databases on my O'Reilly blog. This blog entry hit Reddit and the comments are show just how far Reddit has declined.