Suppose I have a data frame with 6 columns, and I want to set col 1:3 to the values in col 4:6 (this comes up a lot when merging). With data frames it's easy:Suppose I have a data frame with 6 columns, and
阅读背景：
如何将数据表中的多个列设置为同一数据表中不同列的值？
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