Keyphrases
- database
- query processing
- query evaluation
- response time
- query expansion
- user queries
- relevance feedback
- np complete
- np hard
- user interaction
- keyword search
- range queries
- vector space
- retrieval systems
- data sources
- aggregate queries
- optimal solution
- keywords
- complex queries
- query execution
- result set
- truth table
- indexing techniques
- user defined
- multi dimensional
- computational complexity
- data structure
- search engine