Keyphrases
- query language
- query processing
- response time
- database
- efficient processing
- range queries
- query evaluation
- web search engines
- query formulation
- search queries
- query logs
- data sets
- training instances
- database queries
- randomly generated
- user queries
- search engine
- data objects
- attribute values
- relational databases
- web queries
- learning algorithm
- answering queries
- tractable cases