Question

我有一张如下表格

 Board Component Cost

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

我应该给出输入以从表中获取值，比如......

如果输入为20％

输出应为

 Board Component Cost

    b1      c1      5
    b1      c2     10
    b2      c3     15

如果输入为50％

输出应为

 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

Answer 1

首先，由于我们需要对先前的值进行分组和求和，因此您需要一个Identity来实现它。我希望你能想出一个。我创建了这个表来模拟你的情况：

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。这是主要的一个，但是，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：

如果你不想这样，你可以根据上面选择的id在主表上运行一个选择：

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：

Answer 2

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)

Answer 3

试一试

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

Answer 4

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;

应该有效

Answer 5

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

Sql Query根据输入的百分比获取值

5 个答案: