Abstract

Time data is one of the basic data types in database systems. There are two modes of using time data in applications, one is the explicit mode and the other is the implicit mode. In the second mode of application, time attributes of information need to be handled. In this chapter, we introduce three basic types of time data, i.e., point, interval and span. Subsequently, we propose the concepts of temporal information, temporal database and temporal systems, and introduce the basic concepts and core technologies of temporal database. We also analyze the origin and development of temporal information processing technologies and divide the evolution in this research field into three phases. Finally, we analyze the current situation in temporal research field and propose some trends of temporal information technologies.

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