This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Paul is correct that it is not specific to hsqldb. It's not general SQL either though as SQL is a language. It would be more accurate to say that it applies to most if not all database implementations.