Keyphrases
- database
- database queries
- complex queries
- indexing techniques
- response time
- heterogeneous databases
- answering queries
- access methods
- databases
- database objects
- relational databases
- relevance feedback
- query evaluation
- user queries
- query processing
- database applications
- database management systems
- information retrieval
- query language for xml
- retrieval engine
- query result
- indexing structure
- microarray
- molecular biology
- result set
- cost model
- range queries
- web search
- data sources
- query language
- data model
- database systems
- data sets