unique for more than one variable

Question

In R, I've got the following data frame:

> 'data.frame' str(df): 545227 observations of 15 variables:
$ ykod: int 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93 93
$ yad : Factor with 42 levels "BAKUGAN","BARBIE",...: 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
$ donem: int 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 2011
sayi: int 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101 201101
$ mkod: int 4 5 9 11 12 18 20 22 25 26...$ mkod: int 4 5 9 11 12 18 20 22 25 26...$ mkod: int
405 8075 9710 10145 9297 7973 $ mad: Factor with 10464 levels " Defne Market ",..: 405 8075 9710 10145 9297 7973

Answer 1

df <- data.frame(yad = c("BARBIE", "BARBIE", "BAKUGAN", "BAKUGAN"),
                 per = c("AYLIK",  "AYLIK",  "2 AYLIK", "2 AYLIK"),
                 hmm = 1:4)

df
#       yad     per hmm
# 1  BARBIE   AYLIK   1
# 2  BARBIE   AYLIK   2
# 3 BAKUGAN 2 AYLIK   3
# 4 BAKUGAN 2 AYLIK   4

unique(df[c("yad", "per")])
#       yad     per
# 1  BARBIE   AYLIK
# 3 BAKUGAN 2 AYLIK

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