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cyear (cyear) 于 (Wed May 14 23:40:09 2008) 提到:
有个文件：
A 4
A 5
B 1
B 2
B 3
怎么能得到：
A 9
B 6
谢谢！！
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cyear (cyear) 于 (Wed May 14 23:59:31 2008) 提到:
哪位帮帮忙！1
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GunS (火枪) 于 (Thu May 15 08:24:25 2008) 提到:
proc sort data=a;
by col1;
run;
data b;
set a;
by col1;
if first.col1 then col3=0;
col3+col2;
if last.col1;
drop col2;
rename col3=col2;
run;
