Keyphrases
- databases
- database
- database queries
- data sources
- indexing techniques
- query processing
- user defined
- data retrieval
- response time
- web databases
- heterogeneous databases
- query interface
- user queries
- relational databases
- recursive queries
- deep web
- range queries
- data structure
- knowledge discovery
- data integration
- data model
- database objects
- relevance feedback
- query expansion
- formal specification
- high level
- database systems
- query evaluation
- database applications
- result set
- complex queries
- retrieval method
- index structure
- information retrieval
- aggregate queries
- query patterns
- answering queries
- retrieval systems