Use a macro instead of 25 proc sql steps? - sas

Question

I have a SAS code (SQL) that has to repeat for 25 times; for each month/year combination (see code below). How can I use a macro in this code?
proc sql;
create table hh_oud_AUG_17 as
select hh_key
,sum(RG_count) as RG_count_aug_17
,case when sum(RG_count) >=2 then 1 else 0 end as loyabo_recht_aug_17
from basis_RG_oud
where valid_from_dt <= "01AUG2017"d <= valid_to_dt
group by hh_key
order by hh_key
;
quit;
proc sql;
create table hh_oud_SEP_17 as
select hh_key
,sum(RG_count) as RG_count_sep_17
,case when sum(RG_count) >=2 then 1 else 0 end as loyabo_recht_sep_17
from basis_RG_oud
where valid_from_dt <= "01SEP2017"d <= valid_to_dt
group by hh_key
order by hh_key
;
quit;

Answer 1

If you use a data step to do this, you can put all the desired columns in the same output dataset rather than using a macro to create 25 separate datasets:
/*Generate lists of variable names*/
data _null_;
stem1 = "RG_count_";
stem2 = "loyabo_recht_";
month = '01aug2017'd;
length suffix $4 vlist1 vlist2 $1000;
do i = 0 to 24;
suffix = put(intnx('month', month, i, 's'), yymmn4.);
vlist1 = catx(' ', vlist1, cats(stem1,suffix));
vlist2 = catx(' ', vlist2, cats(stem2,suffix));
end;
call symput("vlist1",vlist1);
call symput("vlist2",vlist2);
run;
%put vlist1 = &vlist1;
%put vlist2 = &vlist2;
/*Produce output table*/
data want;
if 0 then set have;
start_month = '01aug2017'd;
array rg_count[2, 0:24] &vlist1 &vlist2;
do _n_ = 1 by 1 until(last.hh_key);
set basis_RG_oud;
by hh_key;
do i = 0 to hbound2(rg_count);
if valid_from_dt <= intnx('month', start_month, i, 's') <= valid_to_dt
then rg_count[1,i] = sum(rg_count[1,i],1);
end;
end;
do _n_ = 1 to _n_;
set basis_RG_oud;
do i = 0 to hbound2(rg_count);
rg_count[2,i] = rg_count[1,i] >= 2;
end;
end;
run;

Answer 2

Create a second data set that enumerates (is a list of) the months to be examined. Cross Join the original data to that second data set. Create a single output table (or view) that contains the month as a categorical variable and aggregates based on that. You will be able to by-group process, classify or subset based on the month variable.
data months;
do month = '01jan2017'd to '31dec2018'd;
output;
month = intnx ('month', month, 0, 'E');
end;
format month monyy7.;
run;
proc sql;
create table want as
select
month, hh_key,
sum(RG_count) as RG_count,
case when sum(RG_count) >=2 then 1 else 0 end as loyabo_recht
from
basis_RG_oud
cross join
months
where
valid_from_dt <= month <= valid_to_dt
group
by month, hh_key
order
by month, hh_key
;
…
/* Some analysis */
BY MONTH;
…
/* Some tabulation */
CLASS MONTH;
TABLE … MONTH …
WHERE year(month) = 2018;