How to select a group from a column based on values from another column using conditional statements

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忘了有多久
忘了有多久 2020-12-14 23:36

I have a sample dataset as follows:

    df <- data.frame(column_id = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,          


        
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