I need to find top 5 Transaction_Due_Date in Proc sql - sas

Question

This code works for top value but I need top 5 values
proc sql;
create table cash.gO5 as
select * , max(Transaction_Due_Date) as max1 format = date9.
from cash.Orders_Dim65
group by Customer_Name;
quit;

Answer 1

PROC SQL does not support order analytical functions such as rank() as found in other flavors of SQL; however, there are numerous ways in which you can get a rank by group. Here are a few options you can use.
Option 1: PROC RANK
proc rank does exactly what it sounds like: ranks stuff. Note that your data must be sorted if being used in SAS 9 or SPRE.
proc rank data=sashelp.cars
out=want(where=(msrp_rank LE 5))
descending;
by make;
var msrp; /* Variable to rank */
ranks msrp_rank; /* Name of variable holding ranks */
run;
Option 2: Data Step
You can rank using a data step. Note that your data must be sorted if using SAS 9 or SPRE.
proc sort data=sashelp.cars
out=cars;
by make descending msrp;
run;
data want;
set cars;
by make descending msrp;
if(first.make) then Rank = 0;
Rank+1;
if(Rank LE 5);
run;
Option 3: simple.topK CAS Action
If you have Viya, you can use CAS actions to quickly rank large datasets. This can be used in both SAS and Python with the SWAT package.
/* Load sashelp.cars into CAS */
data casuser.cars;
set sashelp.cars;
run;
proc cas;
simple.topk result=r /
table = {caslib='casuser' name='cars' groupby='make'}
casout = {caslib='casuser' name='cars_top_5' replace=true}
aggregator ='max'
bottomK = 0
topK = 5
inputs = {{name='msrp'}}
;
quit;