August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
207
过滤
23.1
什么是过滤器
过滤器允许你在数据集中保留（通过
Keep Only filter
，即保留过滤器）或删除（通
过
Exclude filter
，即排除过滤器）数据。一旦你决定了要保留或删除哪些数据，你
就有如下几种类型的过滤器可供选择：
• Selection
（选择过滤）。
• Calculation
（计算过滤）。
• Wildcard
（通配符过滤）。
• Null
（空值过滤）。
在每种类型中还可以应用两种不同形式的过滤器：
•
数据字段过滤器删除数据的列（字段）。
•
数据值过滤器删除数据的行。
23.2
不同类型的过滤器
让我们深入了解每种类型的过滤器，以了解如何以及何时使用它。
23.2.1
选择过滤
选择过滤是最基本的过滤形式。根据要过滤出数据字段还是数据值，不同类型的过
滤器有着不同的体验。
可以在
Prep Builder
中的多个地方过滤出数据字段（列），但
metadata grid
（元数
据网格）是最理想的。你可以根据需要轻松选择和取消选择复选框选项。元数据网
格在输入步骤以及整个流程中的清理步骤中都可用（见图
23-1
）。
208
｜
第
23
章
图
23
-
1
：Tableau Prep 中的 metadata grid（元数据网格）
也可以通过数据字段顶部的省略号菜单（…）来删除列（见图 ...
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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.