Keyphrases
- database schema
- database language
- relational databases
- object oriented
- sql queries
- structured query language
- information extraction
- database
- web pages
- entity relationship
- integrity constraints
- database applications
- schema mappings
- databases
- database design
- functional dependencies
- normal form
- relational model
- xml data
- visual basic
- domain ontology
- relational algebra
- query language
- database server
- database systems
- schema evolution
- information retrieval