Keyphrases
- hypertree width
- hypertree decomposition
- conjunctive queries
- bounded treewidth
- tree width
- decomposition methods
- winning strategy
- boolean functions
- database theory
- expressive power
- query evaluation
- query answering
- np complete
- integrity constraints
- tree decomposition
- query language
- structural properties
- decomposition method
- special case
- data exchange
- decision problems
- constraint satisfaction problems
- shortest path
- upper bound