August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
385
数据准备的文档记录
描述允许你（流程作者）在准备分析数据时，对流程中每一步发生的事情添加更多
细节信息。
42.5
颜色
在
Tableau Prep
的开发过程中，很早就添加了一个功能，那就是为步骤分配颜色的
能力，以便为流程添加可视化文档。这对构建流程的人和基于该流程进行维护或进
一步开发的人都很有用。在
Prep Builder
中，有两个关键步骤的颜色特别有作用。
42.6
连接
当把数据集连接在一起，或者如图
42-6
所示把数据
self-join
（自连接）在一起时，
通过颜色来显示有两个不同的数据集在一起，这样是很有用的。这不仅在你拾取别
人的流程时非常有用，而且还有助于确保你使用了来自传入数据集的正确数据字段。
图
42
-
6
：显示包括颜色逻辑在内的记录良好的连接的流程
我喜欢将颜色逻辑应用于连接，将黄色和蓝色的输入混合在一起，创建一个绿色的
输出。这样，我就可以立即看到正在连接的两个数据字段（见图
42-7
）。这在
inner
join
（内连接）上特别有用，因为在内连接中，字段通常是相同的。如果你能看到
哪个输入源有不匹配的字段，就能很容易地看到哪里的值没有被连接。
图
42
-
7
：给连接步骤着色有助于对其进行设置
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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.