Keyphrases
- database
- imprecise information
- query processing
- response time
- query evaluation
- data structure
- query formulation
- range queries
- data sources
- retrieval systems
- uncertain databases
- boolean queries
- aggregate queries
- original query
- keywords
- incomplete information
- keyword search
- complex queries
- query execution
- user defined
- attribute values
- relevance feedback
- decision making
- data sets