如何删除半重复数据？

最好的办法是 duplicates drop id,force

学习一下

data a;
input company   $     times      variables;
cards;
a 0 25
a 1 23
a 2 24
b 0 23
c 0 66
c 1 98
d 0 11
e 0 12
; run;

data temp1(drop=c);
set a;
by company;
if first.company then c=.;
c+1;
if last.company=1;
run;