---方法1
select decode(deptno,10,'财务部',20,'研发部',30,'销售部','未知部门') dept,round(avg(sal),0),round(avg(nvl(comm,0)),0),case
when avg(nvl(comm,0))>300 then '奖金不错'
when avg(nvl(comm,0))>100 and avg(nvl(comm,0))<300 then '奖金一般'
when avg(nvl(comm,0))<100 then '几乎没奖金'
end status
from emp
group by deptno
order by deptno desc,avg(sal) desc;
---方法2
select decode(deptno,10,'财务部',20,'研发部',30,'销售部','未知部门') dept,round(avg(sal),0),round(avg(nvl(comm,0)),0),
decode(
sign(round(avg(nvl(comm,0)),0)-300),
1,'奖金不错',
0,'奖金不错',
-1,decode(
sign(round(avg(nvl(comm,0)),0)-100),
1,'奖金一般',
0,'奖金一般',
-1,'几乎没有奖金'
)
)
as status from emp
group by deptno
order by deptno desc,avg(sal) desc;