Rename variable in proc summary

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How do I rename "real_date" to "year_qtr" to show in the proc summary output?

data for_summary;
set OUTPAT;
real_date=input(eventdate,YYMMDD10.);
format real_date date9.;
run;

proc summary data=for_summary;
where (cpt between '99201' and '99215')
or (cpt between '99241' and '99245')
or (cpt between '99381' and '99397')
or (cpt between '99354' and '99355')
or (cpt between '99401' and '99412')
;
where also real_date between '01JAN2021'd and '30JUN2021'd;
class real_date;
format real_date yyq6.;
var cost;
output out=EMpull2 sum=QTR_COST;
run;

[Norman21]

In the penultimate line of your code, try:

output out= EMpull2 (rename=(sum=QTR_COST real_date=year_qtr) ) ;

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That worked. Now, I'm trying to have an output that shows the distinct count of an ID called "memberno" by quarter.  So I would like to see how many distinct members there were in Q1 vs. Q2 along with the cpt codes and cost.  So it would look like this:

cpt codes  Q1                                            Q2                                                     cost

code1       #ofmmbers with this code         #of members with this code in         $$$$

code2        #of members with this code

....

proc summary data=for_summary;
where (cpt between '99201' and '99215')
or (cpt between '99241' and '99245')
or (cpt between '99381' and '99397')
or (cpt between '99354' and '99355')
or (cpt between '99401' and '99412')
;
where also real_date between '01JAN2021'd and '30JUN2021'd;
class cpt real_date;
format real_date yyq6.;
var cost;
output out=EMpull2 (rename=(sum=QTR_COST real_date=year_qtr) ) ;
run;

[Kurt_Bremser]

Define "output". Do you mean the print output in the Results window/tab, or the resulting dataset?