1.Create a macro variable that contains a list of all variables that exist in a SAS dataset
/* Sample data */
data one;
input x y;
datalines;
1 2
;
/*data步宏*/
%macro lst(dsn);
%local dsid cnt rc;
%global x;
%let x=;
/* Open the data set */
%let dsid=%sysfunc(open(&dsn));
/* The variable CNT will contain the number of variables that are in the */
/* data set that is passed in. */
%let cnt=%sysfunc(attrn(&dsid,nvars));
/* Create a macro variable that contains all dataset variables */
%do i = 1 %to &cnt;
%let x=&x %sysfunc(varname(&dsid,&i));
%end;
/* Close the data set */
%let rc=%sysfunc(close(&dsid));
%mend lst;
/* Pass in the name of the data set */
%lst(one)
%put macro variable x = &x;
/*proc sql宏变量，dictionary.columns*/
proc sql noprint;
select distinct name
into : varlist separated by ' '
from dictionary.columns
where libname='WORK' and memname='ONE';
quit;
2 Dynamically rename multiple variables in a SAS data set
/* Create a sample data set. Note the naming pattern of COL1-COL5 is */
/* incomplete. Since COL4 is missing, a numbered range list can not */
/* used for this rename. */
data a;
col1=1;
col2=2;
col3=3;
col5=5;
x=123;
run;
/* Use SQL to create the macro variable VARLIST by retrieving the */
/* variable names from DICTIONARY.COLUMNS. Verify the LIBNAME and */
/* MEMNAME values match your existing data set. Note the values */
/* must be specified in upper case. 'NEW' will replace 'COL' for */
/* the appropriate variables. */
proc sql noprint;
select trim(name)||'=NEW'||substr(name,4)
into :varlist separated by ' '
from DICTIONARY.COLUMNS
WHERE LIBNAME EQ "WORK" and MEMNAME EQ "A"
and upcase(name) like 'COL%';
quit;
/* Use PROC DATASETS to do the rename. Again, verify the libref and */
/* member name match your data set. */
proc datasets library=work nolist;
modify a;
rename &varlist;
quit;
/* Confirm changes with a PROC CONTENTS */
proc contents data=a;
run;
3 Placing a list of values into a series of macro variables
%macro varlist(lib,dsn);
proc sql noprint;
select distinct name
into :varname1-:varname999
from dictionary.columns
where(libname=upcase("&lib") &
memname=upcase("&DSN"));
quit;
%do i=1 %to &sqlobs;
%put &i &&varname&i;
%end;
%mend varlist
资料来源
http://support.sas.com/kb/25/083.html
http://support.sas.com/kb/26/009.html