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Query to return set of rows with aggregate more than

Posted on 2014-01-25
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Last Modified: 2014-01-26
Can we create a query that will return the minimum set of rows, ordered by column A, where sum(column B)>=X ?  So in the following example, with X=4, it should return first and second rows.

create table table1(id int, qty int)
insert into table1 (id,qty) select 1,3
insert into table1 (id,qty) select 2,2
insert into table1 (id,qty) select 3,6
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Question by:Vadim Rapp
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5 Comments
 
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Expert Comment

by:Éric Moreau
ID: 39809313
It is 2 different queries but you can Union them to get a single resultset:

declare @x int
set @x = 4
select top 1 * from table1 order by id
UNION
select * from table1 where qty >= @x
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Author Comment

by:Vadim Rapp
ID: 39809372
Sorry, I don't see how this will return the rows with the sum of qty being >=4
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 39809478
I think you want something like this:
declare @x int
set @x = 4
;with data as (select t.id, t.qty, (select sum(x.qty) from yourtable x where x.id <= t.id ) sum_qty
          from yourtable t
)
select * from data
where sum_qty >= @x
  and sum_qty - qty < @x

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LVL 40

Author Closing Comment

by:Vadim Rapp
ID: 39809499
Thanks; we in fact wanted not only the last row but all rows that make the total, so with little modification:

declare @x int
set @x = 10
;with data as (select t.id, t.qty, (select sum(x.qty) from table1 x where x.id <= t.id ) sum_qty
          from table1 t
)
select * from data
where (
            sum_qty <= @x
            or
            sum_qty - qty < @x
          )

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0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39809969
sorry for that, but I see you solved it.
you can even make the condition simpler:
declare @x int
set @x = 4
;with data as (select t.id, t.qty, (select sum(x.qty) from yourtable x where x.id <= t.id ) sum_qty
          from yourtable t
)
select * from data
where sum_qty - qty < @x

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Glad I could help
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