Keyphrases
- join queries
- query optimization
- conjunctive queries
- query processing
- query language
- parallel processing
- database systems
- r tree
- query execution
- complex queries
- cost model
- spatial databases
- join processing
- query optimizer
- data model
- join algorithms
- query plan
- spatial join
- query evaluation
- efficient processing
- xml data
- np complete
- metadata
- data analysis
- data exchange
- join operations