I want to sort data by styleid and rank_no
I want this result
but using my program I obtain
as if the data is sorted only by styleid
input rank_no$ styleid$;
proc sort data=have;
by styleid rank_no ; run;
You get exactly what you told proc sort to do.
According to your expected result, you need to change the order of variables in the by:
proc sort data=have; by rank_no styleid; run;
The result from that is
rank_no styleid 1 3 1 4 2 1 2 2 3 2
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