I was happy to review a very nice book called "Database in Depth".
Database in Depth Relational Theory for Practitioners
By C.J. Date
First Edition May 2005
Series: Theory In Practice
ISBN 10: 0-596-10012-4 | ISBN 13: 9780596100124
I reviewed it in English and Italian for my SIForge.org web site.
Give it a try!