%macro bl(var);
proc sql noprint;
select name into :keeplist separated by ' '
from sashelp.vcolumn
where libname='WORK' and memname='A' and name like '&var';
quit;
%mend bl;
%bl(a%_1);
为什么调用这段宏后,提示:
WARNING: 没有解析宏 _1 的调用