TY  - BOOK
AU  - Leon, Alexis.
TI  - Sql: complete reference 
SN  - 0074637088
U1  - 005.7402  
PY  - 2002///
CY  - New Delhi
PB  - Tata McGraw Hill Publishing Company Ltd
KW  - Relational database management systems
KW  - Data Normalization
KW  - Aggregate functions
KW  - Data integrity
ER  -