Keyphrases
- response time
- query language
- query processing
- efficient processing
- query evaluation
- database
- search queries
- query logs
- web search engines
- user queries
- retrieval systems
- query formulation
- answering queries
- data sources
- attribute values
- range queries
- image retrieval
- search engine
- aggregate queries
- query types
- tree patterns
- prior art
- complex queries
- database queries
- co occurrence
- web search
- relational databases
- information retrieval