Keyphrases
- query processing
- response time
- database
- query language
- web search engines
- data sources
- efficient processing
- query evaluation
- databases
- query formulation
- query logs
- range queries
- user defined
- search queries
- result set
- selectivity estimation
- conjunctive queries
- indexing techniques
- complex queries
- statistical databases
- user queries
- web queries
- aggregate queries
- boolean queries
- query types