查询同一张表里同一个字段值的和以及状态是2（或1）时，该字段值的和

SQL语句：

select a.sum allLength, b.sum length
          from
          (select 1 as t, SUM(length) as sum from t_base_cabinet) a,
          (select 1 as t, SUM(length) as sum from t_base_cabinet where status=2) b
        where a.t = b.t