August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
253
使用数据角色
All
（全部）
将显示符合数据角色的结果和不符合数据角色的结果（用感叹号表示）。
Valid
（有效）
将只显示符合数据角色的结果。
Not valid
（无效）
将只显示不符合数据角色的结果（这样你就可以开始清理它们，而不会被有效
的结果分散注意力）。
你也可以按数据角色成员进行分组，但我还没有发现这样做对我的数据准备有帮助
的案例。也许这将是未来准备数据的一个挑战。
28.2
自定义数据角色
从
2019.3.1
版本开始，不仅可以使用
Tableau
的数据角色，还可以从任何字符串或
整数数据字段中创建一个自定义数据角色。该数据角色将包含字段中的所有值。要
创建自定义数据角色，在
Clean
（清理）步骤中，打开要使用的数据字段中的省略
号菜单（…），如图
28-5
所示。
图
28
-
5
：在省略号菜单中创建自定义数据角色
254
｜
第
28
章
自定义数据角色保存在
Tableau Server
或
Tableau Online
上，因此你需要发布它们。
选择
Publish as Data Role
（发布为数据角色）将把该数据角色的输出放到
Flow
（流程）
窗格中（见图
28-6
）。
图
28
-
6
：数据角色输出图标
自定义数据角色的
Output
（输出）配置与发布到
Tableau Server
或
Online
位置的数
据源配置方法类似。你必须指定要将数据角色发布到的 ...
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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.