运行总计最大限制

Question

我有一个简单的问题，但对我来说有点难解决。我想总结一个特定的列，直到它达到极限并自行重置。 (SQL 2012)

假设限制为 50

 - List item
 - Value    Total
 - 10        10
 - 20        30
 - 30        60
 - 40        50   (60-limit) + the current row value
 - 2         2
 - 3         5
 - 10        15
 - 25        40
 - 15        55
 - 5         10 (55-limit) + the current row value

非常感谢。

Answer 1

如果您有 SQL Server 2012 或更高版本，应该这样做：

DECLARE @Table TABLE (Id INT, ListItem INT);
INSERT INTO @Table VALUES (1, 10);
INSERT INTO @Table VALUES (2, 20);
INSERT INTO @Table VALUES (3, 30);
INSERT INTO @Table VALUES (4, 40);
INSERT INTO @Table VALUES (5, 2);
INSERT INTO @Table VALUES (6, 3);
INSERT INTO @Table VALUES (7, 10);
INSERT INTO @Table VALUES (8, 25);
INSERT INTO @Table VALUES (9, 15);
INSERT INTO @Table VALUES (10, 5);
WITH RunningTotal AS (
SELECT Id, ListItem, SUM(ListItem) OVER (ORDER BY Id) % 50 AS RT FROM @Table)
SELECT
    rt.Id,
    rt.ListItem,
    CASE WHEN rt.RT < rt2.RT THEN rt.RT + 50 ELSE rt.RT END AS RunningTotal
FROM
    RunningTotal rt
    LEFT JOIN RunningTotal rt2 ON rt2.Id = rt.Id - 1
ORDER BY
    rt.Id;

棘手的一点是允许数字一次溢出 50，否则这将是微不足道的。

结果是：

Id  LI  RunningTotal
1   10  10
2   20  30
3   30  60
4   40  50
5   2   2
6   3   5
7   10  15
8   25  40
9   15  55
10  5   10

Answer 2

create table running_totals
(
    id  int identity(1,1),
    val int

)

insert into     running_totals

select 1    union all
select 20   union all
select 10   union all
select 30   union all
select 50   union all
select 10   union all
select 11   union all
select 22   union all
select 40   union all
select 60   union all
select 20   union all
select 10   union all
select 15

declare cur_run_tot cursor for select id,val from running_totals order by id asc
declare @id int ,@val int,@runtot int
open cur_run_tot
create table #RunTot
(
    id int,val int, runtot int
)

fetch next from cur_run_tot into @id,@val

while @@FETCH_STATUS = 0
begin 


    if @runtot is null or @runtot+@val > 50 
        set @runtot = @val
    else 
        set @runtot = @runtot+ @val

    insert into #RunTot
    select @id,@val,@runtot

    fetch next from cur_run_tot into @id,@val   
end

select id as ID, val as Current_Value, runtot as Running_Total from #RunTot

drop table #RunTot
deallocate cur_run_tot

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运行总计最大限制