Keyphrases
- database
- query processing
- relevance feedback
- response time
- user queries
- data structure
- query evaluation
- range queries
- query expansion
- search queries
- query formulation
- efficient processing
- complex queries
- retrieval method
- indexing techniques
- query result
- user interaction
- digital libraries
- search engine
- databases
- aggregate queries
- boolean queries
- retrieval engine
- query execution
- query terms
- user defined
- retrieval systems
- relational databases