Selected papers of the 9th annual ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Introduction to constraint databases
Introduction to constraint databases
Database Issues in Geographic Information Systems
Database Issues in Geographic Information Systems
Spatial SQL: A Query and Presentation Language
IEEE Transactions on Knowledge and Data Engineering
Geo-SAL: A Query Language for Spatial Data Analysis
SSD '91 Proceedings of the Second International Symposium on Advances in Spatial Databases
MLPQ: a linear constraint database system with aggregate operators
IDEAS '97 Proceedings of the 1997 International Symposium on Database Engineering & Applications
On-line maintenance of simplified weighted graphs for efficient distance queries
GIS '06 Proceedings of the 14th annual ACM international symposium on Advances in geographic information systems
Efficient MaxCount and threshold operators of moving objects
Geoinformatica
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Designing query languages for geographic information systems using the traditional approach of constantly adding new data types and operations on the new data types has reached a limit beyond which the query language is no longer easy to understand or convenient to use. We advocate instead the design of query languages based on constraint databases. We show that many formerly difficult-looking queries, such as the shortest path query, can be expressed using simple SQL-like queries of constraint databases.