Keyphrases
- answering queries
- query language
- query processing
- efficient processing
- complex queries
- user queries
- query answering
- approximate answers
- web search engines
- range queries
- query evaluation
- response time
- data sources
- database
- query formulation
- web queries
- probabilistic databases
- retrieval systems
- attribute values
- search queries
- statistical databases
- aggregate queries
- database systems
- query answers
- information retrieval