August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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6
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连接到数据库
使用数据文件将是大多数用户数据准备工作的重要组成部分，但连接数据库是另一
种选择。大多数组织已经建立了大量的数据资产，其中大部分都保存在数据库中。
在本章中，我们将探讨什么是数据库，如何将
Prep Builder
安全地连接到数据库，
以及何时应避免连接到数据库。
6.1
什么是数据库
数据库、数据仓库和数据湖是大多数在日常工作中使用数据的人都熟悉的术语，但
对于其他人来说，区分它们是很重要的：
数据库
驻留在计算机（通常是服务器）上的一种软件，专门摄取、存储数据并向其他
工具提供数据。数据库很可能被分割成不同的对象，即表和视图。因此，数据
库中的数据需要有良好的结构。
数据仓库
即一个数据库的集合或一个特别大的数据库。因为它将多台服务器存储在一起，
数据仓库允许在它们之间共享内存等资源。
数据湖
一个相对比较新的概念，正在变得越来越普遍，其可以更灵活地存储所有数据
类型和文件。数据往往被保存在数据湖中，等待处理和重组后再存储在数据库中。
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除非另有说明，我将使用数据库作为所有三种数据存储形式的统称。
数据库将大部分数据存放在表格中。主要的数据库类型——关系型数据库，通过分
配数据的数字
ID
，让你可以在参考表或维度表中查询，通过优化存储空间使得数据
更新更加容易。其将所需的数据拼凑在一起 ...
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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.