I pull from a database that has sum, but not all, variables prefixed with XCBM_
I would like to remove all of these prefixes from the variables name.
Here is what I have tried:
DATA TEST;
SET SASHELP.BWEIGHT;
RUN;
%MACRO RENAME(LIB=,DSN=);
PROC CONTENTS DATA=&LIB..&DSN;
TITLE 'BEFORE';
RUN;
PROC SQL NOPRINT;
SELECT NVAR INTO :NUM_VARS
FROM DICTIONARY.TABLES
WHERE LIBNAME="&LIB" AND MEMNAME="&DSN"
;
SELECT DISTINCT(NAME) INTO :VAR1-:VAR%TRIM(%LEFT(&NUM_VARS))
FROM DICTIONARY.COLUMNS
WHERE LIBNAME="&LIB" AND MEMNAME="&DSN"
;
QUIT;
%PUT &NUM_VARS;
PROC DATASETS LIBRARY = &LIB;
MODIFY &DSN;
RENAME
%DO I = 1 %TO &NUM_VARS.;
%IF %SUBSTR(&&VAR&I,1,2) = 'm_' %THEN %DO;
&&VAR&I = %SUBSTR(&&VAR&I,3);
%END;
%END;
;
RUN;
QUIT;
PROC CONTENTS DATA=&LIB..&DSN.;
TITLE 'AFTER';
RUN;
%MEND RENAME;
%RENAME(LIB=WORK,DSN=TEST)
How many variables do you expect? Can you use a single macro variable for the rename statement or would you expect it to be longer than 62K characters?
Example could be adapted to work with prefixes below:
/********************************************************************
Example : Rename variables based on suffix rather than prefix
********************************************************************/
data sample;
do i=10000 to 12000;
start_date=i;
middle_date=i+3;
end_date=i+5;
date_no_change=start_date;
output;
end;
format start_date end_date middle_date date9.;
run;
proc sql noprint;
select catx("=", name, catt('DT_', tranwrd(upper(name), '_DATE', ' ')))
into :rename_list
separated by " "
from sashelp.vcolumn
where libname='WORK'
and memname='SAMPLE'
and upper(trim(name)) like '%_DATE';
quit;
%put &rename_list;
proc datasets library=work nodetails nolist;
modify sample;
rename &rename_list;
run; quit;
proc print data=sample noobs;
run;
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