There are duplicate identifiers in my dataset. Regardless, each has a different area code. I need to flag where the same id appears under a different area code. I'm sure there's a straightforward solution, just not sure what it is. Can anyone help? Thanks in advance.
proc sql;
select id from have group by id
having count(distinct area_code)>1;
quit;
Thank you, I figured it would be a proc sql. But, where can I insert a command for a separate column (e.g., diff_area_code_flag = 1)?
proc sql;
select *,case when count(id)>1 then 1 else 0 end as diff_area_flag from have group by id;
quit;
proc sql;
select *,case when count(distinct area_code)>1 then 1 else 0 end as diff_area_code_flag
from have
group by id;
quit;
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