Keyphrases
- databases
- database queries
- database
- data sources
- query processing
- data retrieval
- relational database systems
- query evaluation
- query language
- indexing techniques
- efficient processing
- user queries
- relational databases
- web search engines
- statistical databases
- database systems
- relational database management systems
- multidimensional databases
- query interface
- complex queries
- database views
- response time
- null values
- query logs
- query terms
- data model
- retrieval systems
- query patterns
- web databases
- selectivity estimation
- frequent updates
- approximate matches
- query rewriting
- aggregate queries
- query formulation
- data mining
- information retrieval
- information systems
- search queries
- data warehouse