I'd like to sort 'date' and make item a group.

[kokodenden52]

I'd like to write the program below

date        item     sale

18/9/1       A       1,000

18/9/1       B       2,000

18/9/1       C       3,000

18/9/2       A       2,000

18/9/2       C       4,000

18/9/3       A       1,000

18/9/3       B       2,500

18/9/3       C       4,100

I'd like to sort 'date' and make item a group.

Please teach me.

[PaigeMiller]

It would appear that your data is already sorted by date.

I don't know what you mean by "make item a group".

[PGStats]

If you would like to sort by date within each item group, sort by item, then date:

proc sort data=myData; by item date; run;