为什么选A
题目:
given the sas data set sasdata.two;
x   y
5  2
3  1
5  6
the following sas program is submitted
data sasuser.one
        sasuser.two
        other;
      set sasuser.two;
      if x eq 5 then output sasuser.one;
      if y lt   5 then output sasuser.two;
output;
run;
答案是:
data set sasuser.one has 5 observations
dataset sasuser.two has 5 observations
dataset work.other has 3 observations
这是为什么?
谢谢