sas - proc sql join in do loop with macro -


i trying join on 15 tables , wrote macro has 2 loops , program wrote way. 

%macro joinnow (year, tno);  %do year=1991 %to 2012;  %do tno=2 % 23;  full join a_&year t&tno on t1.id=t&tno.id %end; %end; %mend;

now run program 

proc sql;  create table new_tab      select t1.*, t2.reg_1991,-----,t23.reg_2012      a_1990 t1     %joinnow;  ;  quit;

i error saying 

error: column reg_2002 not found in table/view identified     correlation name t13.

where reg_2002 present in t13

can see error is?


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