August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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37
第
4
章
塑造数据
正如上一章所讨论的那样，数据准备的第一步是了解原始数据集的结构，第二步是
确定数据集需要处于什么结构，也就是分析所需的状态。本章将介绍这些因素和
Prep Builder
重塑数据的功能，以帮助你快速确定如何塑造未来的数据集从而进行分
析。
4.1
在输入的数据集中寻找什么
让我们通过建立一个数据转换表（见图
4-1
）来看看一个典型的来自
Excel
的数据集。
这个例子使用的是冰淇淋味香皂的销售情况。
图
4
-
1
：冰淇淋味香皂的销售和利润数据
在评估一个传入的数据集时，确定数据的维度（或
Category[
分类值
]
）和
Measures
（度量）都很重要。维度是
Tableau Desktop
用来描述记录的数据列的术语。例如，
一个产品的销售区域，或该产品所属的类别。度量是指正在分析的数据集的数值（如
大学班级的学生人数或他们支付的学费金额）。如果维度都是单独列出来的，则不
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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.