1

我有一张如下表

 Board Component Cost

    b1     c1       5
    b1     c2       10
    b2     c3       15
    b3     c4       20
    b3     c5       25
    b4     C6       25
  ---------------------
                  100%

我应该提供输入以从表中获取值，例如...

如果输入为 20%

输出应该是

 Board Component Cost

    b1      c1      5
    b1      c2     10
    b2      c3     15

如果输入为 50%

输出应该是

 Board Component Cost

    b1      c1      5
    b1      c2     10
    b2      c3     15
    b3      c4     20

等等

如何在sql server中编写查询

4

5 回答 5

1

首先，由于我们需要对以前的值进行分组和求和，因此您需要一个身份来实现这一点。我希望你能想出一个。我创建了这张表来模拟你的情况：

create table mySUM(
id int identity(1,1),
id2 varchar(50),
cost int)

insert into mySUM values
('c1',  5),   ('b1', 10),    ('b2',15),    ('b3',20),    ('b3',25),    ('b4',25)

我有两个选择给你。这是主要的，但由于我们正在分组和求和，它将导致最后一列的总和：

select a.Id, a.id2, sum(b.cost) as totalCost
from mySUM a cross join mySUM b
where b.Id <= a.Id
group by a.Id,a.id2
having sum(b.cost)<=50
order by  a.Id

结果：

1   c1  5
2   b1  15
3   b2  30
4   b3  50

如果您不希望这样，您可以根据上述选择的 id 在主表上运行选择：

select * from mySUM where id in(
    select a.Id
    from mySUM a cross join mySUM b
    where b.Id <= a.Id
    group by a.Id,a.id2
    having sum(b.cost)<=50
)

结果：

1   c1  5
2   b1  10
3   b2  15
4   b3  20
于 2012-05-22T09:14:35.463 回答
1 
DECLARE @T TABLE (Col1 VARCHAR(10), Col2 VARCHAR(10), Col3 INT, SumValue Int)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b1','c1',5)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b1','c2',10)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b2','c3',15)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b3','c4',20)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b3','c5',25)

INSERT INTO @T(Col1, Col2, Col3)
VALUES ('b4','C6',25) 

DECLARE @SumValue INT

UPDATE @T
SET @SumValue=SumValue = ISNULL(@SumValue,0)+ Col3
FROM @T T

SELECT *
FROM @T
WHERE SumValue <= (
    SELECT TOP 1 SumValue
    FROM @T AS T
    WHERE T.SumValue>=40
    ORDER BY SumValue)
于 2012-05-22T11:21:07.930 回答
0

试试这个

SELECT  t.* ,
        rt.runningTotal
FROM    Test t
        CROSS APPLY ( SELECT    SUM(cost) AS runningTotal
                      FROM      Test
                      WHERE     Board <= t.Board
                                AND Component <= t.Component
                    ) AS rt
WHERE   runningTotal <= 50
ORDER BY t.Board
于 2012-05-22T09:22:01.580 回答
0

试试这个：

with CTE (Board, Component ,Cost, rownum)
as
(
SELECT Board,Component, Cost,
ROW_NUMBER() OVER(order by Cost asc, Board asc, Component asc) rownum
  FROM yourTable t0
  where Cost > 0
)
select
t1.Board,t1.Component, t1.Cost, t1.rownum, sum(t2.Cost)
from 
CTE t1 join CTE t2 on t1.rownum >= t2.rownum
group by t1.Board,t1.Component, t1. Cost, t1.rownum
having sum(t2.Cost) < 50
order by t1.rownum;

应该管用

于 2012-05-22T10:12:25.920 回答
0 
create table #per(
Board varchar(10),
Component varchar(max),
Cost int)

create proc out_per (
@desire_per int)
as begin

declare @sum int, @count int;
declare @board varchar(max), @component varchar(max);
declare @cost int;
declare per_cursor cursor for
select Board,Component,Cost from per
open per_cursor
fetch next from per_cursor into @Board, @component, @cost
while(@@fetch_status=0)
    begin
        insert into #per values (@Board, @component, @cost);
        set @sum=(select sum(cost) from #per)
        if(@sum>=@desire_per)
        begin
            break;
        end
        fetch next from per_cursor into @Board, @component, @cost
    end
    close per_cursor
    deallocate per_cursor
    select * from #per
    truncate table #per
end

exec out_per @desire_per=30
于 2012-05-22T12:45:51.250 回答