RDBMS is based on firm mathematics set theory with simple and clear data structure, and powerful query function, so it has become the basic technology for realization of information system.

因为RDBMS是建立在严格的数学集合论基础上的，数据结构简单、清晰，具有强大的查询能力，RDBMS成为实现信息系统的基本技术。

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Query processing is the key technology of information integration system, we discussed the problem of optimizing query processing.

查询处置是信息集成体系的关键技术，文中讨论了查询优化处置题目。

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Besides the traditional functions, such as spatial information display, query, analysis, the system has the features of real-time positioning and navigation by the GPS technology.

该系统除了具有传统的空间信息显示、查询、分析等功能外，还利用现在迅速兴起的GPS定位技术，实现实时的定位导航功能。

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