August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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214
｜
第
23
章
的数据，这点很重要。需要记住，从数据集中过滤出数值，就等于删除了该行中的
所有其他信息。
从数据集中过滤出数据行的一些原因包括：
•
删除数据错误。如果你不知道值应该是什么，就不可能纠正错误的数据。在这
种情况下，删除数据记录是唯一的选择。
•
删除范围外的数据行。你的数据集可能是在最后一个完整的交易年，在这种情
况下，拥有多个年份的数据是没有意义的，所以要过滤掉额外年份的数据行。
•
提高性能。正如第
12
章中提到的，减少行数可以提高
Prep Builder
在生成和运
行流程时的响应时间。
•
确保数据安全。可能会遇到某些最终用户不应该访问某些记录的情况。在
Tableau Server
中，可以通过设置
User Filters
（用户过滤器）来管理数据安全，
但
Prep Builder
没有这个功能。因此，可能希望使用过滤器来删除机密记录，然
后输出一个新的数据集，从而让用户安全访问。
23.5
小结
过滤器可能是数据准备中使用最多的清理技术，所以本章还可以有更多内容。本章
已经介绍了基础知识，第
37
章将介绍更高级的过滤技术。练习过滤并对你从数据集
中删除的内容感到满意是至关重要的。部署正确的过滤技术不仅能让你为分析做好
数据准备，还能让你的数据更新流程适合后续的应用。
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.