Question

I’m trying to do this in Enterprise Guide, with a task, otherwise I would just use a data step.

In a data step, this would be:

data names;
 input name $;
 datalines;
  John
  Mary
  Sally
  Fred
  Paul
 ;
run;

data check;
 input name $;
 datalines;
  Mary
  Fred
 ;

Proc sort data=names; by name; run;
Proc sort data=check; by name; run;

Data work.not_in_check;
 merge names(in=n) check(in=c);
 by name;
 if n and not c;
run;

Answer 1

Here’s one way. There are surely many others.

proc sql;
 create table not_in_check as
 select name
 from names
 where name not in (select name from check);
quit;