Dropping observations in SAS based on length

Question

I have a dataset that I'm trying to create tables from but I need to filter out the observations that don't belong in those tables. I'm still learning my way around SAS, so I don't know how to drop the observations using conditions.

Basically I want to drop the observations that have an ID value that is not four digits (in terms of length). Is this possible?

Thanks in advance.

Answer 1

Assuming your ID is character, and you don't consider blanks digits:

if lengthn(id) ~= 4 then delete;

If your ID is numeric:

if 1000 <= id <= 9999 then output;

Answer 2

If id is character:

where length(id) = 4;

If id is numeric:

where id between 1000 and 9999;