Keyphrases
- relational databases
- datalog queries
- database
- semantic query
- relational database systems
- query processing
- query language
- relational database management systems
- databases
- relational data
- query evaluation
- response time
- complex queries
- web search engines
- database objects
- sql statements
- relational operators
- data sources
- relational model
- efficient processing
- database queries
- datalog programs
- answering queries
- sql queries
- probabilistic databases
- deductive databases
- structured query language
- data structure
- range queries
- null values
- information retrieval
- tree patterns
- object oriented
- relational algebra
- data objects
- xml data
- functional dependencies
- query optimization
- user queries