August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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154
｜
第
17
章
举个例子，假设有一个
Excel
工作簿，里面有三个表：
York Sales
、
Leeds Sales
和
Reference Table
。如果想把
York
商店销售表和
Leeds
商店销售表合并到一起，那么
在上述界面中
Sheet
选项部分，输入 *Sales 作为匹配模式即可。
这样一来，表名中“
Sales
”一词之前的任何字符都将被忽略，因而
York Sales
表和
Leeds Sales
表将被包含在内。因为
Reference
表不符合匹配模式，所以它不会被包
含在联合数据中，也不能用于分析。该功能还可以保证流程的后续适应性，因为任
何符合指定匹配模式的新表都会被添加到流程中并进行处理。
17.5
小结
与连接一样，联合是一种基本的数据准备技术。可以说，联合数据比连接更容易使用，
因为不需要设置任何条件，联合数据只需要将数据集堆叠起来，创建一个用于分析
的单一表格。最后，在输入步骤上使用通配符联合技术可以确保当匹配的文件被添
加到文件夹或其他位置后，它们将在下次运行流程时被添加到数据集中，从而省去
了额外的输入步骤。
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