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SQL> with table1 as(
  2  select 10 id from dual union all
  3  select 1001 from dual union all
  4  select 1002 from dual union all
  5  select 1003 from dual union all
  6  select 1004 from dual union all
  7  select 20 from dual union all
  8  select 2001 from dual union all
  9  select 2002 from dual union all
10  select 2003 from dual
11  )
12  select id from table1 order by substr(id,0,1),length(id) desc,substr(id,length(id),1);

        ID
----------
      1001
      1002
      1003
      1004
        10
      2001
      2002
      2003
        20

9 rows selected

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