Keyphrases
- data model
- query language
- databases
- database systems
- object oriented
- relational model
- data sources
- object model
- semi structured
- data modeling
- database design
- data mining
- data integration
- data types
- data sets
- relational algebra
- semantic web
- special case
- digital libraries
- real world
- database
- entity relationship
- schema evolution
- relational data model