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报表参数与数据过滤

实际使用报表时，我们经常并不需要将数据库中所有的数据都呈现出来，而是根据一些设定的条件过滤出需要的数据，这就是报表的数据过滤。

在报表中，支持数据集过滤和组件数据过滤两种数据过滤方法。

这两种过滤方法的关键区别是作用时机不同，数据集过滤是在创建数据集时进行的数据过滤，直接作用于数据库；而报表组件过滤是将数据从数据库提取到内存后再进行过滤，是在内存中进行。

本章节将为您详细介绍这两种数据过滤方法各自的特点及使用方法。