August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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427
第
49
章
评估是否完全需要
Prep Builder
我们有时会想得太多，在数据准备中也经常会这样。一旦你掌握了熟练的数据准备
技能，就很容易过于关注数据而采取根本不需要的步骤。本章将介绍什么时候可以
使用
Tableau Desktop
来完成数据准备过程，以及
Prep Builder
是更好选择的情况。
49.1 Tableau
数据准备历史
早在
2010
年，当我在
5.2
版本第一次尝试
Tableau Public
，并成为
Tableau Desktop
7
版本以后的重度用户时，在
Tableau
中完成数据准备工作是非常艰难的，除非面对
的是非常简单的应用场景。
Prep Builder
在那个时候只是
Tableau
开发者眼中的一抹
亮色。
普通的数据准备任务不得不在
Tableau Desktop
之外进行，原因有很多，比如性能原
因（处理速度较慢），但最主要的问题是功能的缺乏。用户经常不得不使用外部工
具来完成任务。
Tableau Excel
插件扩展（见图
49-1
右上角）是将数据从列转换到行
的主要方式。这对于处理概览数据和保存在不同列中的日期（即不适合
Tableau
的
数据，如第
4
章所述）非常有用。
复杂的数据连接、数据删除和联合并不像现在这样是
Tableau Desktop
中数据连接窗
口的一部分。这意味着，要使用多个数据源，必须在
Tableau
之外准备数据，通常
是在
SQL
服务器中。
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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.