Hi,
I have a dataset
ID age var1
1 30 1
1 30 2
1 32 1
1 33 3
How do I remove duplicate ID and age ? It doesn't matter if I keep the first or last of duplicate
So the I want my table to look like
ID age var1
1 30 1
1 32 1
1 33 3
Thanks
You can remove duplicats, either by
proc sort data=have out=want NODUPKEY;
by id age;
run;
or by SQL:
proc sql;
create table want as
select * from have
group by id, age
; quit;
If you compare the rwo methods, you'll find that -
the one keeps the 1st occurence while the other keeps the last occurence.
As much as I remeber, SQL keeps the 1st occurence.
Given that your data set is already in sorted order by ID AGE, you could try:
data want;
set have;
by id age;
if first.age;
run;
It's worth spending time on the BY statement in a DATA step and how it creates FIRST.AGE (and a few more variables). Those will be tools you use over and over again.
proc sort data=have;
by ID age var1;
run;
data want;
set have;
by ID age var1;
if first.var1;
run;
Are you ready for the spotlight? We're accepting content ideas for SAS Innovate 2025 to be held May 6-9 in Orlando, FL. The call is open until September 25. Read more here about why you should contribute and what is in it for you!
Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
Find more tutorials on the SAS Users YouTube channel.