A First Course in Database Systems
(second edition), by Jeffrey D. Ullman & Jennifer Widom.
Prentice Hall. (2002). [required]
SQL In a Nutshell, by Kevin
Kline with Daniel Kline. O'Reilly. (2001). [optional]
SQL Essentials, by Gary
Randolph & Jeffrey Griffin. Franklin, Beedle &
Assoc. (2005). [optional]