Reorder with just a single Query?

Question

If I have a table like
ID | Desc | Sortorder
1 One 3
4 Two 2
6 Three 1
Is there a way I can use a single query to change the Sortorder to 1,2,3 based on my ORDER BY ID without having to write a script?

Answer 1

and a complete example
SQL> create table   x as
  2  (
  3  select 1 id, 'One' descr,  3 sortorder from dual union all
  4  select 4 id, 'Two' descr,  2 sortorder from dual union all
  5  select 6 id, 'Three' descr,  1 sortorder from dual
  6  )
  7  /
Table created.
SQL> select *
  2    from x
  3  /
        ID DESCR  SORTORDER
         1 One            3
         4 Two            2
         6 Three          1
SQL> merge into x
  2  using (
  3  select id
  4       , row_number() over (order by id
  5                           ) rn
  6       , rowid rid
  7    from x) x_orig
  8   on (x.rowid = x_orig.rid)
  9   when matched then
10   update set sortorder = x_orig.rn
11  /
3 rows merged.
SQL> select *
  2    from x
  3  /
        ID DESCR  SORTORDER
         1 One            1
         4 Two            2
         6 Three          3