August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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224
第
25
章
拆分数据字段
在准备字符串数据进行分析时，会采取的最常见的操作之一是将一个字符串字段分
割成多个部分的子串。要回顾数据类型相关的内容，可知在第
9
章中简要提到了拆分，
该章介绍了处理字符串的基础知识。拆分有很多原因，比如业务系统拾取数据并为
每条记录输出唯一的
ID
，或者将记录合在一起以便将它们放入指定的数据库表中。
人类的大脑在发现数据中的模式方面是非常好的（毕竟这也是我们创建可视化分析
的原因），所以往往可以通过观察数据集来发现需要拆分的数据字段（列）。
例如，在图
25-1
中，我们可以看到，为了帮助我们分析这个数据集，可能需要将左
边的
Product Code
（产品代码）字段拆分成三个独立的列（在右边）。
图
25
-
1
：拆分 Product Code（产品代码）字段的结果
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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.
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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.