Hierarchies and relative operators in the OLAP environment
ACM SIGMOD Record
Spatial SQL: A Query and Presentation Language
IEEE Transactions on Knowledge and Data Engineering
Data Cube: A Relational Aggregation Operator Generalizing Group-By, Cross-Tab, and Sub-Total
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Extending Geographic Databases for a Query Language to Support Queries Involving Statistical Data
SSDBM '00 Proceedings of the 12th International Conference on Scientific and Statistical Database Management
An open source and web based framework for geographic and multidimensional processing
Proceedings of the 2006 ACM symposium on Applied computing
A language and a visual interface to specify complex spatial patterns
PAKDD'07 Proceedings of the 11th Pacific-Asia conference on Advances in knowledge discovery and data mining
Modelling and querying geographical data warehouses
Information Systems
Providing geographic-multidimensional decision support over the web
APWeb'05 Proceedings of the 7th Asia-Pacific web conference on Web Technologies Research and Development
Querying spatial and temporal data by condition tree: two examples based on environmental issues
ICCSA'13 Proceedings of the 13th international conference on Computational Science and Its Applications - Volume 1
| Hi-index | 0.00 |
The authors propose a declarative Pictorial Query Language (called PQL) that is able to express queries on an Object-Oriented geographic database drawing the features which form the query. These features refer to the classic ones of a geographic environment (geo-null, geo-points, geo-polyline, and geo-region) and define the alphabet of the above mentioned language. This language, extended with respect to a previous one, considers twelve positional operators and a set of their specifications. Moreover, the possibility to use the mentioned language to query multidimensional databases is discussed. Finally, the characteristic of the mentioned language by a query example is shown.