topic Re: proc sql max function in SAS Programming

proc sql max function

serrld113 — Fri, 17 Aug 2018 18:59:23 GMT

So I have 100k+ records. Some students have taken this test several times and have gotten different scores. I'm trying to select the max term and the score that would accompany that latest term for each student.

However, when I run this code:

proc sql;
create table test as 
select distinct stu_id, max(term) as term, score
from table
group by stu_id, score
;
quit;

For example, if I have this student

005G0K2W 3 400

005G0K2W 5 235

this is what I end up getting, for example:

005G0K2W 5 400

005G0K2W 5 235

but I want this:

005G0K2W 5 235

edit: students don't have to have all terms or be enrolled up to term 5, so some students might only have term 1, some might have terms 2 and 5 or any other combination.

Have:

009FX8YG 1 111

009FX8YG 4 259

010G0K2W 3 400

010G0K2W 5 235

01WG248D 2 369

01WG248D 3 326

09FX569H 2 654

Want:

009FX8YG 4 259

010G0K2W 5 235

01WG248D 3 326

09FX569H 2 654

Re: proc sql max function

novinosrin — Fri, 17 Aug 2018 18:35:39 GMT

Are you missing having clause

proc sql;
create table test as 
select distinct stu_id,  term, score
from table
group by stu_id
having term=max(term)
;
quit;

Re: proc sql max function

serrld113 — Fri, 17 Aug 2018 18:54:34 GMT

This will not work...it keeps only the max term overall (5). So terms 1,2,3,4 are now completely gone along with the students that don't have a term 5.

Re: proc sql max function

novinosrin — Fri, 17 Aug 2018 18:56:14 GMT

Ok, Can you please provide a better and comprehensive sample of what you HAVE and what you WANT, so that the community can code, test and then post plz

Re: proc sql max function

novinosrin — Fri, 17 Aug 2018 19:03:01 GMT


data have;
input stu_id $ term score;
cards;
009FX8YG 1 111
009FX8YG 4 259
010G0K2W 3 400
010G0K2W 5 235
01WG248D 2 369
01WG248D 3 326
09FX569H 2 654
;

proc sql;
create table want as
select *
from have
group by stu_id
having term=max(term);
quit;

Re: proc sql max function

serrld113 — Fri, 17 Aug 2018 19:05:29 GMT

Thank you!! Your previous response was correct as well I just didn't see that group by...thanks again!