求sql：得到所占份额及累计份额

[吃饱饱吖]

求sql：得到所占份额及累计份额

create table t_sum_abc(num int,material varchar(20),amount numeric(9,2))

insert t_sum_abc
select ROW_NUMBER() over(order by amount desc) num ,material,amount
from(
	select 'DM0000000001' material,100 amount
	union all
	select 'DM0000000002',25
	union all
	select 'DM0000000003',80
	union all
	select 'DM0000000004',200
	union all
	select 'DM0000000005',250
	union all
	select 'DM0000000006',50
	union all
	select 'DM0000000007',75
	union all
	select 'DM0000000008',60
	union all
	select 'DM0000000009',80
) _a

希望得到结果：
num material amount 金额所占份额 金额累计份额
1 DM0000000005 250.00 27.17% 27.17%
2 DM0000000004 200.00 21.74% 48.91%
3 DM0000000001 100.00 10.87% 59.78%
4 DM0000000009 80.00 8.70% 68.48%
5 DM0000000003 80.00 8.70% 77.18%
6 DM0000000007 75.00 8.15% 85.33%
7 DM0000000008 60.00 6.52% 91.85%
8 DM0000000006 50.00 5.43% 97.28%
9 DM0000000002 25.00 2.72% 100.00%

[liangCK]

create table t_sum_abc(num int,material varchar(20),amount numeric(9,2))

insert t_sum_abc
select ROW_NUMBER() over(order by amount desc) num ,material,amount
from(
    select 'DM0000000001' material,100 amount
    union all
    select 'DM0000000002',25
    union all
    select 'DM0000000003',80
    union all
    select 'DM0000000004',200
    union all
    select 'DM0000000005',250
    union all
    select 'DM0000000006',50
    union all
    select 'DM0000000007',75
    union all
    select 'DM0000000008',60
    union all
    select 'DM0000000009',80
) a

select *,CAST(amount*100./(select sum(amount) from t_sum_abc) AS numeric(10,2)) as 金额所占份额,
    CAST((SELECT SUM(amount) FROM t_sum_abc WHERE num<=A.num)*100./(select sum(amount) from t_sum_abc) AS numeric(10,2)) AS 金额累计份额
from t_sum_abc AS A

drop table t_sum_abc

[SQLCenter]

with t1 as
(
select ROW_NUMBER() over(order by amount desc) num ,material,amount, total=sum(amount)over(partition by getdate())
from(
	select 'DM0000000001' material,convert(float,100) amount
	union all
	select 'DM0000000002',25
	union all
	select 'DM0000000003',80
	union all
	select 'DM0000000004',200
	union all
	select 'DM0000000005',250
	union all
	select 'DM0000000006',50
	union all
	select 'DM0000000007',75
	union all
	select 'DM0000000008',60
	union all
	select 'DM0000000009',80
	) a
),
t2 as
(
	select *, total1=(select sum(amount) from t1 where num<=t.num) from t1 t
)
select num, material, amount, ltrim(convert(numeric(5,2),amount*100/total))+'%', ltrim(convert(numeric(5,2),total1*100/total))+'%' from t2

[sql_bd]

select *,
金额所占份额=ltrim(cast(amount*100.0/(select sum(amount) from t_sum_abc) as dec(18,2)))+'%',
金额累计份额=ltrim(cast((select sum(amount) from t_sum_abc where num<=t.num)*100.0/(select sum(amount) from t_sum_abc) as dec(18,2)))+'%'
from t_sum_abc t

[SQL2088]

select 
	num ,
	material,
	amount,
	金额所占份额=ltrim(cast(amount*100.0/(select sum(amount) from t_sum_abc)as decimal(18,2)))+'%',
	金额累计份额=ltrim(cast((select sum(amount) from t_sum_abc where num<=t.num)*100.0/(select sum(amount) from t_sum_abc)as decimal(18,2)))+'%'
from t_sum_abc t

num         material             amount                                  金额所占份额                                     金额累计份额
----------- -------------------- --------------------------------------- ------------------------------------------ ------------------------------------------
1           DM0000000005         250.00                                  27.17%                                     27.17%
2           DM0000000004         200.00                                  21.74%                                     48.91%
3           DM0000000001         100.00                                  10.87%                                     59.78%
4           DM0000000009         80.00                                   8.70%                                      68.48%
5           DM0000000003         80.00                                   8.70%                                      77.17%
6           DM0000000007         75.00                                   8.15%                                      85.33%
7           DM0000000008         60.00                                   6.52%                                      91.85%
8           DM0000000006         50.00                                   5.43%                                      97.28%
9           DM0000000002         25.00                                   2.72%                                      100.00%

(9 行受影响)
drop table t_sum_abc

[coleling]

我习惯用联接解决问题：（似乎效率要高一点点）

select a.num, a.material, a.amount, cast(cast(a.amount/c.totalamount*100 as numeric(10,2)) as varchar(10))+'%' as 金额所占份额, cast(cast(b.sumamount/c.totalamount*100 as numeric(10,2)) as varchar(10))+'%'  AS 金额累计份额
from t_sum_abc a
join 
(
	select a.num, sum(b.amount) as sumamount
	from t_sum_abc a
	join t_sum_abc b on a.num >= b.num
	group by a.num
) b on a.num = b.num
cross join 
(
	select sum(amount) as totalamount from t_sum_abc
) c