Say there was a table like this:


. 1 2 3
A x 2 a
B y 7 b
C x 2 c
D x 3 d
E z 6 e


I want to filter out all rows for example where columns 1 & 2 in a row are the same as another row. So it would only show that row once. The end result would be like this:


. 1 2 3
A x 2 a
B y 7 b
C x 3 d
D z 6 e


How would I do that?