Keyphrases
- query language
- query processing
- user defined
- database
- efficient processing
- response time
- query evaluation
- web search
- query formulation
- retrieval systems
- range queries
- boolean operators
- aggregate queries
- statistical databases
- search queries
- user queries
- database queries
- result set
- web search engines
- data model
- web queries
- database systems
- probabilistic databases
- candidate set
- information retrieval