XML概率数据库中空值处理方法研究

Research on Null Values in Probabilistic XML Database

不确定性和不完全性是现实世界对数据库的挑战,空值、XML和概率数据库三者的结合可以更好地处理数据,但同时也增加了数据库的复杂性。阐释了空值在XML概率数据库中的两种意义,其中一种解释会产生概率区间,然后采用一种折中的方法解决了引入空值的基于XML的概率数据库产生的概率区间问题,并证明其正确性。最后提出一种新的N次矩运算,用来对数据库数据进行全面的分析。

Uncertainty and Incompleteness are a real-world challenges of the database. The combination of NULL value and probabilistic XML database can better deal with data, but also increase the complexity of the database. We proposed two interpretation what means the null value in the XML probabilistic database,one of them can generate probahilistic interval, so we presented a compromise solution to the probahilistic interval problem in probabilistic XML database with NULL value. Finally, we proposed an N^th moment method for anglicizing probabilistic database comprehensively.