Two Novel Semantics of Top-k Queries Processing in Uncertain Database.
Dexi LiuChangxuan WanNaixue XiongLaurence Tianruo YangLei ChenPublished in: CIT (2010)
Keyphrases
- database
- query processing
- aggregation queries
- database queries
- query language
- efficient processing
- null values
- database systems
- relational database systems
- query result
- relational databases
- uncertain databases
- complex queries
- databases
- indexing techniques
- user defined
- query answers
- database query languages
- relational calculus
- query evaluation
- answering queries
- formal semantics
- consistent query answering
- database management systems
- query plan
- result set
- cost model
- relational data model
- database schema
- web databases
- skyline queries
- integrity constraints
- data management
- incomplete information
- query optimization
- sparql queries
- sql queries
- data sources
- imprecise information
- data model