数据中有重复的纪录，用一种简单的方法把重复的纪录去掉（以第一个变量为key variable)作者: shiyiming 时间: 2004-9-3 23:49 标题: reply data a;
input a $ b c;
datalines;
p1 2 4
p2 3 8
p1 2 4
p3 8 9
;
run;
solution 1:
proc sort data=a out=b nodupkey;
by a b c;
run;
solution 2:
proc sort data=a out=c;
by a b c;
run;
data c;
set c;
by a b c;
if not first.a and not first.b and not first.c then delete;
run;作者: shiyiming 时间: 2004-9-6 09:46 标题: 谢谢forestshen 谢谢forestshen,我后来用的是solution 1;你的solution 2也启发了我的思路,非常感谢!