大家在哪些情景用到了Factless Fact Tables的设计?

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Oracle 关于Factless Fact Tables的描述

Factless Fact Tables
Factless fact tables do not contain measures such as sales price or quantity sold. Instead, the rows of a factless fact table are used to show events not represented by other fact tables. Another use for factless tables is as a "coverage table" which holds all the possible events that could have occurred in a given situation, such as all the products that were part of a sales promotion and might have been sold at the promotional price.


下面是我的翻译:
无事实事实表不包含度量,例如销售价格或者销售数量。相反,无事实事实表的行记录的是其他事实表没有展示的事件。一个无事实事实表的用例是“覆盖表”,存储了给定情况下的所有可能发生的事件,例如促销活动中的所有商品可能以促销价格售出。
 
我不是很理解描述中的例子,如果那位同仁在实际项目中用过,能否具体描述一下数据表模型是如何关联的?
如果有其他使用情景,也可举例说明一下。
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