August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
349
处理兑换率
38.2.3
第
3
步：应用兑换率
现在所有的东西都在一个表中，你可以将兑换率应用到你要转换的值上（见图
38-4
）。
图
38
-
4
：兑换率计算
这里将指定的兑换率应用到值上，使最终用户的分析比他们必须在每个
Tableau
Desktop
工作簿中自己建立单独的算式要容易得多。
38.3
兑换率的长期策略
为一次性的数据准备流程创建一个解决方案是不错的，但如果该流程将被多次重复
使用和
/
或数据更新，则需要长期的策略来确保兑换操作的准确性和稳健性。
38.3.1
频率管理
处理像货币这样的兑换率最具有挑战性的问题之一，是需要知道企业想要应用这些
兑换率的频率。如果将每小时、每天、每周、每月、每季度和每年的单个值作为参
考表，这非常有用──但这个表很快就会变得非常庞大。
通过只存储可能需要的数据，并确保正确使用兑换率的规则是明确的，这样能避免
花费大量的时间来修复生成报告的过程中后续不匹配的值。
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