Keyphrases
- complex queries
- cost model
- queries involving
- response time
- user queries
- query processing
- database
- multiple queries
- query evaluation
- temporal queries
- query optimization
- query execution
- boolean queries
- rewrite rules
- database queries
- range queries
- keyword search
- approximate answers
- database systems
- databases
- data management
- relevance feedback
- management system
- data sources
- structured queries
- keywords