August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
101
数据概要分析
这种突出显示功能可以让你深入挖掘数据集，提出后续问题，这些问题在研究最初
的问题时不可避免地会出现。
当评估某些列中有空值的记录时，这种技术特别有用（见图
11-10
）。通过选择某
个字段中的空值，可以看到这些记录的产生日期或其他位关键信息，以确定是否应
该用其他值替换空值或完全删除。
图
11
-
10
：选择一个空值
11.3.4
查看维度计数
Prep Builder
对数据进行概要分析的最后一种方式是显示一个维度中有多少个成员
（唯一值）。该计数显示在概况窗格中数据字段的顶部（见图
11-11
）。
图
11
-
11
：对数据字段的不同日期进行计数
在这种情况下，数据集内有七个不同的日期。当这个计数比预期的多或少时，它可
以提醒你去分析问题可能出在哪里。
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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.