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create or replace procedure myproc(o_str out varchar2) as
v_cur sys_refcursor;
v_no number(4);
begin
open v_cur for
select a,b,c from t;
v_no :=1;
for i in v_cur loop
    o_str := o_str||i.a||v_no||i.b||v_no||i.c||v_no||';';
    v_no :=v_no+1;
end loop;
close v_cur;
end;
/


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