Oracle 按指定順序排序

select *
  from (select 'Nick' as item
          from dual
        union all
        select 'Viki' as item
          from dual
        union all
        select 'Glen' as item
          from dual
        union all
        select 'Robin' as item
          from dual
        union all
        select 'Total' as item from dual) pre_tab
 order by decode(item, 'Viki', 1, 'Glen', 2, 'Robin', 3, 'Nick', 4);