对两种估计单属性关系大小方法的可信度讨论

Discussion on the Certainty of two Methods Estimating a Single-Attribute Relation's Size

估计两个单属性关系在连接属性上取相同值的个数的方法有两种:静态估计法和动态估计法.本文利用不精确性推理模型对这两种方法的可信度定量地进行讨论,并用具体例子进行说明.

There are two methods to estimate the number of the same values of two single-attribute relations in join's attribute:static estimation and dynamic estimation.This paper makes use of inaccuracy reasoning model to discus the certainty of the two methods in detail,concrete examples are provided for illus- tration.