Merge 和 SET 的不同

data one;

input x y$;

cards;

1   Groucho

3   Harpo

5   Kart

2   kate

;

data two;

input X Z$;

cards;

2   Chico

4   Zeppo

;

proc sort data=one;

   by x;

run;

proc sort data=two;

   by x;

run;

data classact;

   set  onetwo ;

run;

得到的结果是：

merge :

merge by :
set by: