首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Why not SQL!
Authors:MAX J EGENHOFER
Institution:National Center for Geographic Information and Analysis and Department of Surveying Engineering , Boardman Hall, University of Maine , Orono, ME, 04469, U.S.A.
Abstract:Abstract

The application of traditional database query languages, primarily the Structured Query Language SQL, for geographical information systems (GIS) 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.
Keywords:
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号