August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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412
第
47
章
保持数据更新
一旦准备好了一个分析用的数据集，要做的下一个选择就是这个流程是否需要重复，
如果需要，多久重复一次。如果输入的数据源更新了，很可能你的流程就需要刷新。
是否拥有
Prep Conductor
将决定有哪些手段可以用来维护数据。
在本章中，我们将探讨刷新数据集的两种不同方法——完全和增量，以及它们之间
的区别。对于每种技术，我们将介绍如何在
Tableau Prep Builder
和
Conductor
中进
行设置。我还将提供使用这些技术时需要注意的一些关键事项。
47.1
刷新数据
刷新数据意味着检查原始输入是否有新的或更改了的数据。如果有，你必须决定是
否应通过数据准备流程推送新的或更改后的数据。
Prep Builder
的优势之一是，一旦
建立了准备流程，你只需单击运行图标或在
Prep Conductor
中设置刷新计划，就可
以重复使用它。
刷新后的数据可能有以下变化：
•
新的数据行。
•
覆盖数据值。
•
新的数据列。
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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.