August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
229
拆分数据字段
的内容。在图
25-9
中，选择
All
（全部）可以确保返回所有数据，即使你希望创建
一定数量的列（见图
25-10
）。
在撰写本文时，
All
选项仅限于拆分
150
个项目。
图
25
-
10
：Custom Split（定制拆分）的结果
定制拆分选项可以让你免于编写一些复杂的计算。在这个例子中，
Prep Builder
建立
的第三个计算公式相当复杂，所以如果你想的话，可以去简化它，但其实没有必要，
除非你的流程的运行性能不足。
25.3
什么时候不要拆分数据
虽然
SPLIT()
是一个强大的函数，但它并不总是适合所有的任务。让我们来看看可
能出现这种情况的几种场景。
25.3.1
地址数据
在图
25-11
中，地址细节用逗号分隔。然而，很难确定适当的分割，因为这些地址
的街道部分的格式不一致，数字和标点符号各不相同。地址通常很难拆分，很可能
需要更复杂的计算和逻辑来将正确的部分对齐到正确的列中。
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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.