TY  - BOOK
AU  - Stephens R.K.,
AU  - Plew R,
TI  - Sams Teach Yourself SQL in  21 Days 
SN  - 8176353647
U1  - 005.7585 
PY  - 2007///
CY  - New Delhi
PB  - Techmedia , New Delhi
ER  -