TY  - BOOK
AU  - Gruber, Martin.
TI  - Understanding sql
SN  - 8170296447
U1  - 005.7402  1
PY  - 1995///
CY  - New Delhi
PB  - BPB Publications
KW  - Using sql to retrieve information from tables
KW  - Querying multiple tables at once
KW  - Formatting query output
KW  - Summarizing data with aggregate functions
KW  - Joining a table to itself
KW  - sing the exists operator
KW  - Using the union clause
ER  -