That O'Reilly book is quite good, but doesn't, to my mind at least, get into the issues of designing databases. (Not that it should, it's a programming guide)

I actually enjoyed reading the Practical SQL Handbook -- I found it to be a very clear, accessible introduction to the basics of designing and using SQL databases.

It also looks like there's a new book out by the same authors called: Practical SQL: The Sequel. So that might also be worth a look.