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SQL 
Information Modeling (D. Edmond) [Mirror] SQL Performance Tuning
Structured Query Language (SQL) : A Practical Introduction. (by Akeel I. Din)
A Gentle Introduction to SQL Introduction to SQL, Version 4.76 (J. Hoffman) [Mirror]
Teach Yourself SQL in 21 Days, 2nd Edition [Mirror] [Mirror] [PDF] [Mirror] [Mirror]
SQL Tutorial [Another] [Another] [Another] [Another] Hierarchical SQL (Joe Celko)
Comparison of different SQL implementations (T. Arvin) SQL Guide and Reference