Keyphrases
- linked data
- conjunctive queries
- join queries
- primary key
- query answering
- query evaluation
- integrity constraints
- np complete
- relational database theory
- linked open data
- data integration
- query language
- data exchange
- semantic web
- structured data
- special case
- acyclic conjunctive queries
- query processing
- query optimization
- open data
- join algorithms
- database systems
- data sets
- data sources
- schema mappings
- decision support
- end users