Sql to obtain top N records satisfying given summary values

 1 declare @ivt table(Qty int,Code nvarchar(10))
 2 insert into @ivt(Qty,Code)
 3 select 7,'a' union
 4 select 3,'b' union
 5 select 4,'c' 
 6 select * from @ivt order by code 
 7 
 8 declare @tb table(Id int ,Qty int,Code nvarchar(10))
 9 insert into @tb(Id,Qty,Code)
10 select 1, 1,'a' union
11 select 2,2,'b' union
12 select 3,3,'c' union
13 select 4,2,'a' union
14 select 5,1,'b' union
15 select 6,3,'a' union
16 select 7,1,'c' union
17 select 8,3,'a' union
18 select 9,2,'c' union
19 select 10,4,'a' 
20 select * from @tb order by id
21 
22 select a.Id,a.Qty,a.Code from @tb a join @tb b on b.id<=a.Id and a.Code=b.Code
23 join @ivt c on c.Code=a.Code
24 group by a.Id,a.Code,a.Qty,c.Qty
25 having sum(b.qty)<=c.Qty

 

https://dba.stackexchange.com/questions/74846/sql-select-top-x-rows-having-sum-limit

DECLARE @Limit FLOAT
SELECT @Limit = 30

SELECT
    o1.Id
    , o1.Cost
    , o1.Category
FROM
    MyOrders o1
    -- Join all orders with same category and inferior ID
    INNER JOIN MyOrders o2 ON o2.ID <= o1.ID AND o1.Category = o2.Category
GROUP BY
    o1.Id
    , o1.Cost
    , o1.Category
HAVING
    SUM(o2.Cost) < @Limit
ORDER BY
    ID