TY  - BOOK
AU  - Ullman,Jeffrey D.
TI  - Principles of database systems
SN  - 0914894137
U1  - 001.64 21
PY  - 1980///
CY  - Potomac, Maryland
PB  - Computer Science Press, Inc.
KW  - Computación electrónica de datos
N1  - Bibliografía p. 360-371; 1 An overview of a database system. 2 Physical data organization. 3 The three great data models. 4 Data manipulation languages for the relational model. 5 Design theory for relational databases. 6: Query optimization. 7 The DBTG proposal. 8 IMS: A hierarchical system. 9 Protecting the  database  against misuse. 10 Concurrent operations on the  database
ER  -