topic Re: loop column names using macro in SAS Programming

loop column names using macro

radha009 — Mon, 16 Apr 2018 20:57:06 GMT

i have column names like below, if data missing in that column insert null else insert App_id

proc contents data=patch.Windows_patch out=patch.contents noprint; run;

proc sql ;
select name into :varlist separated by ' '
from patch.contents where name like '%CHG%';
%let n=&obs;
quit;

data work;

set have;

do i = 1 to &n ;
   if &Patch {i} =' ' then
       &patch{i}=' '
   else
       &patch{i}=App_ID;
end;
run;

Re: loop column names using macro

Reeza — Mon, 16 Apr 2018 21:00:42 GMT

Use a data step and an array instead. SQL doesn't lend itself well to variable lists and multiple variables well and then you can avoid using a macro entirely.

@radha009 wrote:

i have column names like below, if data missing in that column insert null else insert App_id

proc contents data=patch.Windows_patch out=patch.contents noprint; run;

proc sql ;
   select name into :varlist separated by ' '
from patch.contents where name like '%CHG%';
%let n=&obs;
quit;

data work;

set have;

do i = 1 to &n ;
   if &Patch {i} =' ' then
       &patch{i}=' '
   else
       &patch{i}=App_ID;
end;
run;

Re: loop column names using macro

Reeza — Mon, 16 Apr 2018 21:30:07 GMT

Sorry, must have misread your question. You have everything you need to do this and you don't need macros.

If the variables were listed side by side you could also use:

array PATCH(*) FirstVarName -- LastVarName;

data work;

set have;
array Patch (*) &varList.;

do i = 1 to dim(Patch) ;
    if not missing(patch(i)) then patch(i) = APP_ID;
end;


run;

Re: loop column names using macro

Kurt_Bremser — Tue, 17 Apr 2018 04:58:19 GMT

And make the creation of varlist simpler:

proc sql noprint ;
select name into :varlist separated by ' '
from dictionary.columns
where
  libname = "PATCH" and
  memname = "WINDOWS_PATCH" and
  name like '%CHG%';
quit;

No proc contents needed.