Firstly, it explains the influence of the probabilistic relational model on the operation of database, it also indicates the semantic and algorithm of the probabilistic relational model. 首先,阐述了概率关系模型(PRM)对数据库操作的影响,并给出了概率关系模型(PRM)的语义和运算方法。
Secondly, in order to realizing the processing of uncertainty information, the thesis bases on the probabilistic relational model of the non-classical theory of relational database, doing some research on the application in electric power and algorithms of probabilistic sign of probabilistic relational model. 其次,为了实现不确定信息的处理,以非经典关系数据库中概率关系模型(PRM)为基础,对其在电力方面的应用及其电力数据库中的概率计算进行了研究。
So it is better to apply to the non-classical theory of relational database. This thesis focuses on the investigation and application of the probabilistic relational model in the non-classical theory of relational database. 本论文主要是对此类关系数据库模型中的概率关系模型(PRM)进行的研究与应用。
Thirdly, in the establishment of the probabilistic relational model of electric power, this thesis explores value of probabilistic sign of probabilistic relational model, and eventually come to the relevant formula. 第三,在建立电力数据的相关概率关系模型(PRM)时,本文探讨了相关的数据项中的概率属性值,并最终得出了相关的计算公式。
But the key point lies on how to choose the suitable formula for calculating the value of probabilistic sign of probabilistic relational model. 其中,最关键的问题是选择恰当的概率关系模型(PRM)中概率属性值的计算公式。