--x<=30,3060
declare @t table(id int primary key,col decimal(10,2))
insert into @t select 1,26
union all select 2,88
union all select 3,4
union all select 4,76
union all select 5,58
union all select 6,18
union all select 7,84
--第一種方法
select des,cou = count(cou),num = cast(count(cou) as decimal(10,2))/b.cout from(
select
cou = case when a.col <= 30 then 1
when a.col > 30 and a.col <= 60 then 2
else 3 end,
des = case when a.col <= 30 then 'col<=30'
when a.col > 30 and a.col <= 60 then '3060' end
from @t a ) a cross join (select cout = count(1) from @t ) b group by des,b.cout
--第二種方法
select a.des,cou=count(1),num = cast(count(1) as decimal(10,2))/c.cout from
(select sid = 1,leftnum = null,rightnum = 30,des = 'col<=30'
union all select sid = 2,leftnum = 30,rightnum =60,des = '3060'
) a left join @t b on (b.col <= a.rightnum or a.rightnum is null) and (b.col > a.leftnum or a.leftnum is null)
cross join (select cout = count(1) from @t ) c
group by a.des,c.cout
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