Max Egenhofer
International Journal of Geographical Information Systems 6 (2): 71-85, 1992.

Abstract

The application of traditional database query languages, primarily the Structured Query Language SQL, for geographical information systems (GISs) and other non-standard database applications has been tried unsuccessfully; therefore, several extensions to the relational database query language SQL have been proposed to serve as a spatial query language. It is argued that the SQL framework is inappropriate for an interactive query language for a GIS and an extended SQL is at best a short term solution. Any spatial SQL dialect has a number of serious deficiencies, particularly the patches to incorporate the necessary spatial concepts into SQL. .

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