Keyphrases
- data integration
- data exchange
- data model
- databases
- relational algebra
- query language
- relational model
- query answering
- relational databases
- sql queries
- database language
- data types
- database
- database design
- operational semantics
- data modeling
- relational database systems
- database queries
- relational dbms
- database management
- knowledge representation
- inclusion dependencies
- formal model
- structured query language
- null values
- object oriented
- visual basic
- database technology
- conjunctive queries
- sql database
- database applications
- db universal database
- management system
- database processing
- relational calculus
- relational data model
- database access
- database development
- recursive queries
- aggregate functions
- object relational
- database programming
- back end
- cd rom
- ibm db
- normal form
- sql server
- data model and query language