PQL: An Extended Pictorial Query Language for Querying Geographical Databases Using Positional and OLAP Operators.
Elaheh PourabbasMaurizio RafanelliPublished in: ACM-GIS (1999)
Keyphrases
- query language
- data model
- databases
- database
- data integration
- object oriented
- database systems
- expressive power
- data warehouse
- query interface
- data sources
- aggregate functions
- algebraic operators
- database management systems
- relational algebra
- relational model
- multidimensional databases
- query evaluation
- data types
- data warehousing
- efficient query evaluation
- relational databases
- temporal queries
- xml data
- object types
- spatio temporal databases
- on line analytical processing
- database querying
- relational operators
- rdf data
- regular expressions
- transitive closure
- data management
- recursive queries
- knowledge discovery
- structured documents
- constraint databases
- database queries
- database applications
- data cube