随机选取sum(列)=5的记录
表 a
Id Count
1 2
2 2
3 1
4 1
5 2
6 2
7 1
8 2
9 1
10 2

我想从上表中随机选取几条记录，这几条记录的sum(Count) = 5

sql应如何写？
多谢！！

[解决办法]
drop table a
CREATE TABLE a (Id int, Count int)
insert a
select 1 , 2
union all select 2 , 2
union all select 3 , 1
union all select 4 , 1
union all select 5 , 2
union all select 6 , 2
union all select 7 , 1
union all select 8 , 2
union all select 9 , 1
union all select 10 , 2

declare @tb table(num varchar(50),id int,Count int)
insert @tb
select newid(),* from a

select * from @tb c where 5> =(select sum(count) from @tb t where c.num> =t.num)