Keyphrases
- preprocessing
- query processing
- database
- query language
- user defined
- query evaluation
- query logs
- boolean queries
- join queries
- database queries
- post processing
- web search engines
- boolean operators
- answering queries
- query formulation
- preprocessing step
- user queries
- response time
- relational databases
- databases
- query answering
- aggregate queries
- co occurrence
- data sources