3 books • 3 series
Sams Teach Yourself SQL in One Hour a Day (Sams Teach Yourself -- Hours) (Sams Teach Yourself)
Sams Teach Yourself SQL in 24 Hours (Sams Teach Yourself) (Sams Teach Yourself -- Hours)
Sams Teach Yourself SQL in 21 Days (Sams Teach Yourself in 21 Days) (Sams Teach Yourself -- Hours) (Sams Teach Yourself)