按指定id顺序查询

   SELECT a.p,*
  FROM tb1 t,(
    SELECT 5  as id, 1 as p union
    SELECT 9  as id, 2 as p union
    SELECT 2  as id, 3 as p union
    SELECT 1  as id, 4 as p union
    SELECT 10 as id, 5 as p
  ) a
  where t.id=a.id
  order by a.p