TY  - BOOK
AU  - GRUBER, Martin
TI  - Understanding SQL
SN  - 81-7029-644-7
U1  - 006.663 
PY  - 1995///
CY  - New Delhi
PB  - BPB 
KW  - Using The Exists Operator
KW  - Correlated Subqueries
KW  - Using the Union Clause
ER  -