R equivalent of SELECT DISTINCT on two or more fields/variables

unique works on data.frame so unique(df[c("var1","var2")]) should be what you want.

Another option is distinct from dplyr package:

df %>% distinct(var1, var2) # or distinct(df, var1, var2)

Note:

For older versions of dplyr (< 0.5.0, 2016-06-24) distinct required additional step

df %>% select(var1, var2) %>% distinct

(or oldish way distinct(select(df, var1, var2))).

@Marek's answer is obviously correct, but may be outdated. The current dplyrversion (0.7.4) allows for an even simpler code:

Simply use:

df %>% distinct(var1, var2)

If you want to keep all columns, add

df %>% distinct(var1, var2, .keep_all = TRUE)

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