August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
127Prep Builder
中的汇总功能
析数据时，通过汇总数据集来降低粒度可以提高性能。你还可能改变粒度大小，
使其与另一个数据集的粒度相匹配，以使连接数据集变得更容易。
在
Prep Builder
中分析数据
当你想在
Prep Builder
中回答有关数据的问题时，可以使用汇总，而不必将值输
出到
Tableau Desktop
。
15.3
添加汇总的步骤
在我们深入研究有关汇总“怎么做”之前，让我们先来看看添加汇总的步骤。首先
单击你的流程末尾的加号（或你想添加流程的任何地方），然后选择
Add Aggregate
（添加汇总），如图
15-10
所示。
图
15
-
10
：在 Tableau Prep 中选择添加汇总
基本的
Aggregate
（汇总）窗格如图
15-11
所示。
图
15
-
11
：Tableau Prep 中的汇总窗格
128
｜
第
15
章
左边的灰色窗格显示了数据集中的所有字段，以及它们基于数据类型的默认汇总。
有两种方法可以配置这个工具。第一种是将你要汇总的字段拖动到右侧的汇总字段
窗格中，然后选择
Group by
（分组）。可以通过单击列顶部的当前汇总类型（例
如，
Sum
）来更改汇总类型（见图
15-12
）。第二种是单击左侧窗格中每个字段旁边
的
SUM
或
GROUP BY
文本。这将打开包含所有可能的汇总方法的下拉菜单。选择 ...
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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.