data test;
input a b c;
datalines;
1 1 3
1 2 3
1 1 4
1 3 4
1 1 5
;
run;
proc sort data = test nodupkey;
by a b;
run;
选取a,b完全一致的观测删除。
_all_可以删除两个所有变量完全一致的观测。
data test;
input a b c;
datalines;
1 1 3
1 2 3
1 1 4
1 3 4
1 1 5
;
run;
proc sort data = test nodupkey;
by a b;
run;