August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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378
｜
第
41
章
41.3.2
不支持的函数
如果你以前使用过其他数据软件，有时会发现自己在别的地方使用过的、久经考验
的方法。对于使用
Prep Builder
的
Tableau Desktop
用户来说尤其如此。使用别的地
方支持但
Prep Builder
不支持的函数──无论是在部分场景还是完全不支持──都
会给你带来很多挫折感，即使是像
sum()
这样的简单函数，如图
41-8
所示。
图
41
-
8
：由不支持的函数引起的错误
要解决此错误，需要使用汇总步骤或
LOD
（详细程度）计算，因为这些场景里
Prep
Builder
是支持计算总数的函数的。
41.4
小结
在最不希望的时候软件中出现错误，是让人非常沮丧的。花在处理这些错误上的时
间，就是从分析和完成其他工作中损失的时间。空白数据窗格是
Tableau Prep
中出
现问题的一个标志，警告符号只能让你及时发现问题，但希望本章已经给了你一个
走向这些问题处理途径的出发点。
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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.