[size=10.000000pt]data three;
merge one (in=in1) two (in=in2);by num;
if in2;
[size=10.000000pt]run;
[size=10.000000pt]
[size=10.000000pt]求助怎样理解in=in1? 另外我知道if in2 ===> 代表什么?in2=true, if true==>是表示返回这个loop再读取数据?
[size=10.000000pt]
[size=10.000000pt]one:
[size=10.000000pt]
[size=10.000000pt]1 a
[size=10.000000pt]3 b
[size=10.000000pt]
[size=10.000000pt]two:
[size=10.000000pt]1 h
[size=10.000000pt]2 d
[size=10.000000pt]3 p