Keyphrases
- query language
- query processing
- upper bound
- database
- query evaluation
- database queries
- lower bound
- complex queries
- web search engines
- low frequency
- error bounds
- response time
- worst case
- efficient processing
- data sources
- upper and lower bounds
- user defined
- range queries
- boolean queries
- exact answers
- user queries
- search queries
- query logs
- retrieval systems
- data warehouse
- nearest neighbor
- data structure
- high quality
- search engine