Keyphrases
- query processing
- query language
- response time
- range queries
- efficient processing
- database
- aggregate queries
- user queries
- database queries
- query evaluation
- web search engines
- search queries
- probabilistic databases
- answering queries
- complex queries
- information retrieval systems
- data objects
- user defined
- retrieval systems
- attribute values
- keyword queries
- query formulation
- query optimization
- tree patterns
- data sources
- search engine