The TSQL2 Temporal Query Language
The TSQL2 Temporal Query Language
A multigranular spatiotemporal data model
GIS '03 Proceedings of the 11th ACM international symposium on Advances in geographic information systems
The t4sql temporal query language
Proceedings of the sixteenth ACM conference on Conference on information and knowledge management
Formal and conceptual modeling of spatio-temporal granularities
IDEAS '09 Proceedings of the 2009 International Database Engineering & Applications Symposium
On the semantics of ST4SQL, a multidimensional spatio-temporal query language
Proceedings of the 16th International Database Engineering & Applications Sysmposium
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In many different application fields the amount and importance of spatio-temporal data (i.e., temporally and/or spatially qualified data) is increasing in last years and users need new solutions for their management. In this paper we propose a spatio-temporal query language, called ST4SQL. The proposed language extends the well-known SQL syntax and the T4SQL temporal query language [4]. The proposed query language deals with different temporal and spatial semantics. These semantics allow one to specify how the system must manage temporal and spatial dimensions for evaluating the queries. Moreover, the query language introduces new constructs for grouping data with respect to temporal and spatial dimensions. Both semantics and grouping constructs take into account and exploit data qualified with granularities.