Generalized Relational Algebra: Modeling Spatial Queries in Constraint Databases.
Alberto BelussiElisa BertinoMichela BertolottoBarbara CataniaPublished in: CDB (1995)
Keyphrases
- relational algebra
- constraint databases
- query language
- transitive closure
- expressive power
- first order logic
- spatial databases
- data model
- relational model
- geographic information systems
- normal form
- relational database systems
- complex objects
- temporal data
- spatial data
- query evaluation
- relational databases
- conceptual model
- database
- database theory
- database design
- xml data
- databases
- database technology
- functional dependencies
- efficient processing