MIN() works on a row, and takes the minimum for a series of variables. It does not answer the question you've asked.
I've illustrated how it would work in a data step, which also has problems as @PaigeMiller has indicated due to not accounting for missing values.
If you want the value added back into a data step to use in other operations, here are different ways to do that.
******************************************************;
*Add average value to a dataset;
*Solution 1 - PROC MEANS + Data step;
******************************************************;
proc means data=sashelp.class noprint;
output out=avg_values mean(height)=avg_height;
run;
data class_data;
set sashelp.class;
if _n_=1 then
set avg_values;
run;
proc print data=class;
run;
*Solution 2 - PROC SQL - note the warning in the log;
PROC SQL;
Create table class_sql as
select *, mean(height) as avg_height
from sashelp.class;
quit;
******************************************************;
*Add average value to a dataset - with grouping variables;
*Solution 1 - PROC MEANS + Data step;
******************************************************;
proc means data=sashelp.class noprint nway;
class sex;
output out=avg_values mean(height)=avg_height;
run;
*sort data before merge;
proc sort data=sashelp.class out=class;
by sex;
run;
data class_data;
merge class avg_values;
by sex;
run;
proc print data=class_data;
run;
*Solution 2 - PROC SQL - note the warning in the log;
PROC SQL;
Create table class_sql as
select *, mean(height) as avg_height
from sashelp.class
group by sex;
quit;
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