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Celko - Data and Databases - Concepts in Practice (Morgan, 1999)
Celko - Thinking in Sets - Auxiliary, Temporal and Virtual Tables in SQL (Elsevier, 2008)
Celko - Trees and Hierarchies in SQL for Smarties (Elsevier, 2004)
Churcher - Beginning SQL Queries - From Novice to Pro (Apress, 2008)
Donahoo - SQL - Practical Guide for Developers (Elsevier, 2005)
DuBois - MySQL 4e (AW, 2008)
Feuerstein - Oracle PL-SQL Language Pocket Reference 4e (O'Reilly, 2008)
Greenwald - Professional Oracle Programming (Wiley, 2005)
Haan - Applied Mathematics for Database Professionals (Apress, 2007)
Harrington - SQL Clearly Explained 2e (Morgan, 2003)
Kofler - The Definitive Guide to MySQL 5 3e (Apress, 2005)
Kruckenberg - Pro MySQL (Apress, 2005)
Loney - Oracle Database 10g - The Complete Reference (McGraw, 2004)
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Physical Database Design - S. Lightstone, et al., (Elsevier, 2007)
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Wilton,Colby - Beginning SQL (Wrox, 2005)