Keyphrases
- response time
- database
- query processing
- maximum likelihood
- query evaluation
- semantically relevant
- query formulation
- semantic meaning
- transformation rules
- semantic information
- user queries
- range queries
- data structure
- sparql queries
- formal semantics
- complex queries
- keywords
- knowledge base
- database queries
- retrieval method
- query execution
- information retrieval
- algebraic operations
- aggregate queries
- model selection
- aggregate functions
- data sources
- databases
- semantically equivalent
- query containment
- query expansion
- vector space
- keyword search