Keyphrases
- database
- query processing
- response time
- query expansion
- user queries
- query formulation
- relevance feedback
- retrieval method
- query evaluation
- range queries
- computational complexity
- efficient processing
- relational databases
- data structure
- keywords
- web databases
- database queries
- np complete
- indexing techniques
- search queries
- test collection
- information retrieval systems
- data sources
- image retrieval
- information retrieval