Keyphrases
- databases
- database
- database queries
- query language
- query processing
- data sources
- relational database systems
- relational databases
- data retrieval
- web search engines
- information systems
- data model
- response time
- data management
- efficient processing
- query logs
- search queries
- indexing techniques
- database objects
- null values
- database systems
- user queries
- data objects
- database updates
- constraint databases
- data collections
- web databases
- statistical databases
- range queries
- query evaluation
- integrity constraints
- query formulation
- relational database management systems
- aggregate queries
- result set
- knowledge discovery
- answering queries
- query answering
- database views