August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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206
第
23
章
过滤
在清理数据时，最重要的一个因素是决定数据：
•
能否被清理掉。
•
是否应予忽略。
•
是否应予删除。
如果你决定选择后者，那么就需要过滤数据集。这听起来是一个非常容易做出的决
定，但其实不是这样的，尤其是当你正在准备数据供他人使用时。确定你或最终用
户今后不需要这些数据是很困难的。即使你确定不再需要这些数据，也不要将其删
除，除非在数据准备过程中发布数据之前的最后一步，你已经考虑了以下问题之后：
•
该数据是否给用户提供了其他数据点的上下文信息？
•
该数据是否凌乱但可管理？数据可能很难整理，但并不意味着它对最终用户没
有价值。
•
如果业务逻辑发生了变化，也就是说，用户有了不同的业务体验，数据会不会
突然变得有了意义？
带着有关这些注意事项的思考，我们来探讨一下什么是过滤器，以及在哪里使用过
滤器。
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