I want to automate the sas code for every month - sas

Question

I am calculating around 12 metrics (Say Sales for each month individually for latest 12 months). Every month I need to go manually and change the month everywhere. If there is any way to automate it, it would be very helpful. My code is
proc sql;
create table inter.calls as
select a.district_name,
sum(01JAN2016,01FEB2016,01MAR2016)/terr_count as q1_workingdays,
sum(01APR2016,01JUN2016,01MAY2016)/terr_count as q2_workingdays,
sum(01AUG2016,01SEP2016,01JUL2016)/terr_count as q3_workingdays,
sum(01NOV2016,01DEC2016,01OCT2016)/terr_count as q4_workingdays
from inter.calls_made_bymon_reg3 a left join inter.territory_count b
on a.district_name=b.district_name;
quit;
Now when I refresh for JAN2017, I need to change from FEB2016 to JAN2017 for latest 12months. Every time it is difficult to change the code manually.
I will be very thankful if I get any help!!

Answer 1

It's difficult to understand your problem completely, because as Reeza mentioned the arguments in your sum() functions are invalid (the names begin with a number).
However, I do understand the desire not to manually change dates all over the place. You might find a macro like the below helpful:
%macro prev_month(n);
%let latest_date = %sysfunc(intnx(month,%sysfunc(inputn(&latest_month.,monyy7.)),-&n.));
days_%sysfunc(putn(&latest_date.,monyy7.))
%mend prev_month;
And you would then use it in your query like so:
%let latest_month = JAN2017;
proc sql;
create table inter.calls as
select a.district_name,
sum(%prev_month(11),%prev_month(10),%prev_month(9))/terr_count as q1_workingdays,
sum(%prev_month(8) ,%prev_month(7) ,%prev_month(6))/terr_count as q2_workingdays,
sum(%prev_month(5) ,%prev_month(4) ,%prev_month(3))/terr_count as q3_workingdays,
sum(%prev_month(2) ,%prev_month(1) ,%prev_month(0))/terr_count as q4_workingdays
from inter.calls_made_bymon_reg3 a left join inter.territory_count b
on a.district_name=b.district_name;
quit;
Hope it helps.