sql - ORA-01722: invalid number PLSQL IMPLICIT CURSOR - 


begin    v_region_rec in (select region_name, c.country_name                          regions r                          join countries c                            on r.region_id = c.country_id)   loop     dbms_output.put_line (v_region_rec.region_name || '  |  ' ||  v_region_rec.country_name );   end loop; end;

ran plsql statement can't tell why giving me ora-01722: invalid number


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