Unique on a dataframe with only selected columns

Question

I have a dataframe with >100 columns, and I would to find the unique rows, by comparing only two of the columns. I\'m hoping this is an easy one, but I can\'t get it working

Answer 1

Here are a couple dplyr options that keep non-duplicate rows based on columns id and id2:

library(dplyr)                                        
df %>% distinct(id, id2, .keep_all = TRUE)
df %>% group_by(id, id2) %>% filter(row_number() == 1)
df %>% group_by(id, id2) %>% slice(1)