By Yong Tang, Xiaoping Ye, Na Tang
Temporal details Processing expertise and Its purposes systematically stories temporal details processing expertise and its purposes. The booklet covers following matters: 1) time version, calculus and common sense; 2) temporal facts types, semantics of temporal variable ‘now’ temporal database innovations; three) temporal question language, a customary temporal database administration method: TempDB; four) temporal extension on XML, workflow and data base; and, five) implementation styles of temporal purposes, a standard instance of temporal software. The booklet is meant for researchers, practitioners and graduate scholars of databases, data/knowledge administration and temporal details processing. Dr. Yong Tang is a professor on the computing device institution, South China basic college, China.
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Extra info for Temporal Information Processing Technology and Its Applications
For example, considering total amount of pay for the employees of a company, total amount of all employees’ salaries from January to March is 190,000, 180,000 and 200,000. From statistics we can see that: z there exists no other month between two adjacent months, such as January and February; z we are not able to get the statistic of February through interpolation method from the statistics of January and March; 23 Temporal Information Processing Technology and Its Applications z there would be a false message if we adopt stepwise model.
All these are guaranteed by rigorous time calculation. In this chapter, we will introduce all these in sequence, most of which are the pivotal formalization method of temporal database. 1 Time Model Time is continuous in the time axis from the point of the objective world’s view. However, in computer science, we should quantize the continuous time into time point or time interval, in order to build time model. If time were recorded in its original manner, the capacity for the records would have to be very large.
Most of current temporal query languages are based on conventional query language, and they extend temporal query ability to meet the requirements of a temporal database system. For instance, TempSQL, a temporal query language, is based on the framework of conventional query language SQL and adds temporal semantics in it. 3 Temporal System However, temporal database is just a carrier for recording temporal data. The goal of proposing temporal database is to handle temporal information in information systems.
Temporal Information Processing Technology and Its Applications by Yong Tang, Xiaoping Ye, Na Tang