SAS proc sql将2列转换为1列

假设我有一张桌子

 A     |  B
===============
Dan    | Jack
April  | Lois
Matt   | Davie
Andrew | Sally

我想做一张桌子

 C     
======
Dan  
April 
Matt   
Andrew 
Jack
Lois
Davie
Sally

---

使用SAS

proc sql

。我怎样才能做到这一点呢？

我知道您要求使用proc-sql，但下面是使用数据步骤的方法。我认为这更容易：

data have;
input A $ B $;
datalines;
Dan Jack
April Lois
Matt Davie
Andrew Sally
;
run;

proc sql;
create table want as 
select A as name from have
union all
select B as name from have;
quit;

data table2(keep=c);
  set table1;
  c = a;
  output;
  c = b;
  output;
run;

proc sql;
    create table combine as
    select name
    from one
    union
    select name
    from two;
quit;