August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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374
｜
第
41
章
图
41
-
1
：Prep 中参数相关的常见错误信息
函数调用时务必根据语法的要求检查计算中所使用的数据类型。记住，你可以在
Edit Field
（编辑字段）对话框中的
Reference list
（参考列表）右侧看到每个函数的
调用语法示例。
41.2
空白的概况窗格或数据窗格
有多种原因会导致概况窗格或数据窗格空白，但我发现了几个常见的起因。
41.2.1
更改计算或删除下游的数据字段
在图
41-2
中，我创建了一个重复的
NPS
字段，但我在前面的步骤中删除了原来的
字段。
图
41
-
2
：显示更改字段后产生的效果示例流程
｜
375
处理
Prep Builder
错误
显然，这破坏了流程，但我这样做是为了显示问题的来源。在图
41-3
中，重复的
NPS
字段上方的红色感叹号显示了阻止流程运行的错误位置，但这并不是你真正要
修复流程的地方，你需要在前面删除了原始字段的步骤中进行修复。
图
41
-
3
：提示错误的示例流程
使用
Tableau Prep
中的
Change
（更改）窗格来回溯整个流程，以找到该原始字段
被删除的位置。流程右上角的错误图标可以让你读取错误描述，且该对话框下角的
View in flow
（在流程中查看）选项可以带你找到错误（见图
41-4
）。
图
41
-
4
：带有 View in flow（在流程中查看）错误选项的错误示例 ...
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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.