August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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｜
275
去除重复数据
不需要使用连接步骤将任何分类
/
维度数据添加回数据集，因为所有没有在行到列
转换中使用的数据仍然保留在数据集中。这种重复数据删除方法的流程很简单（见
图
30-15
）。
图
30
-
15
：使用图
30
-
14
中的 Pivot（转换）步骤的流程
由此产生的数据集看起来如图
30-16
所示。
图
30
-
16
：从行到列转换后的结果数据集
30.4
小结
从所要分析的数据中删除重复数据，可以使你免于面对一些具有挑战性的计算，并
避免可能会出现的一些错误。重复数据产生的原因，将决定你应该如何选择处理、
删除重复数据的方法，或者是否需要将其完全删除。一如既往地，规划你的数据准
备工作，明确你对输出的要求是选择正确步骤的关键。
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