August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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301
第
34
章
分析计算
Prep Builder
最初发布时，缺少一些
Tableau Desktop
用户习惯的功能。因此，
Tableau Desktop
用户的部分正常分析过程在
Prep Builder
中无法直接实现。其中的
一些功能，即所谓的分析计算，目前正在被添加到
Prep Builder
工具中。
分析计算实际上指的是计算中的函数。在本章中，我们将介绍一种
Tableau Desktop
用户所熟悉的计算类型，称为
Table Calculations
（表计算），在
Prep
中如何以及为
何使用它们，并介绍一些例子和应用场景。
34.1
什么是表计算
Tableau Desktop
中的表计算非常灵活，只需点击几下鼠标就能轻松使用。表计算允
许你处理二级汇总，如排名或流水式总计，没有表计算的话，这些功能在
Tableau
中都无法实现。
表计算的缺点与它们的强大之处完全相同：它们的灵活性。表计算可以很容易地进
行重新配置，以工作在视图中的任何维度上。因此，任何适合的用户想要使用该计
算，他们都需要了解如何重新配置它。对于复杂的视图，如果用户没有正确地重新
配置计算，会影响视图的性能和输出数据的准确性。在数据准备阶段承担这项工作，
能有助于降低这些风险。
例如，让我们使用
Tableau
的
Superstore
（超市）数据集作为一个应用场景，根据每
个地区的销售额来评估其排名。在
Tableau Desktop
中，你需要在视图中同时包含
302
｜
第
34
章
Date
（日期）和
Sales
（销售额），以及将季度销售额分解到
Region ...
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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.