How Many Variables are Needed to Express an Existential Positive Query?
Simone BovaHubie ChenPublished in: Theory Comput. Syst. (2019)
Keyphrases
- database
- user queries
- query processing
- response time
- existentially quantified
- database queries
- variable selection
- data sources
- query evaluation
- query expansion
- user defined
- keywords
- complex queries
- query answering
- positive and negative
- relevance feedback
- image retrieval
- retrieval systems
- query execution
- original query
- ontology based data access