TY  - BOOK
AU  - Gruber, Martin
TI  - Understanding SQL
SN  - 8170296447
U1  - 005.369 SQL 
PY  - 1995///
CY  - New Delhi
PB  - B P B Publications
KW  - Booleans
KW  - Correlated subqueries
KW  - Relational database
ER  -