TY  - BOOK
AU  - Garcia-Molina, Hector.
AU  - Ullman, Jeffrey D.
AU  - Widom, Jennifer.
TI  - Database systems: the complete book 
SN  - 9788131708422
U1  - 005.74  1
PY  - 2011///
CY  - New Delhi
PB  - Pearson
KW  - Relational algebra
KW  - Constraints and triggers
ER  -