Please help to select data by my condition?

Question

Hi everybody,
I have a problem that I cannot resolved it, so I want to helped to write SQL.
I have a records set as following:
No. |     Name     |     Quantity     | GroupId
1.      John          5          1
2.      Henry          3          1
3.     Mary          6          1
4.     Paul          1          1
5.     Thanh          12          1
6.     Thao          8          1
7.     Dat          4          2
8.     Luan          7          2
9.     Loan          9          2
10.     Nhuan          9          2
11.     Huong          2          3
12.     Cau          1          3
13.     Huu Anh          2          3
14.     Hieu          5          3
15.     Hung          17          3
16.     A          3          4
17.     B          1          4
18.     C          2          4
...and so on (about 15 million records)
I want to get records of each groupid (1 record/group) that sum of first records of each group must be greater than or equal to 10.
For example:
- Group 1: 5 + 3 + 6 = 14 > 10 => Result: No. 3 (Mary)
- Group 2: 4 + 7 = 11 > 10 => Result: No. 8 (Luan)
- Group 3: 2 + 1 + 2 + 5 = 10 >= 10 => Result: No. 14 (Hieu)
- Group 4: 3 + 1 + 2 < 10     => No record returned.
But I don't known how to select it. Can anybody help me?
Thanks in advance!
Edited by: xi`tin on 21:25 04-05-2012

Answer 1

create table hutest (
  no number,
  name varchar2(50),
  quantity number,
  groupid number);
insert into hutest values(1,  'John', 5, 1);
insert into hutest values(2,  'Henry', 3, 1);
insert into hutest values(3,  'Mary', 6, 1);
insert into hutest values(4,  'Paul', 1, 1);
insert into hutest values(5,  'Thanh', 12, 1);
insert into hutest values(6,  'Thao', 8, 1);
insert into hutest values(7,  'Dat', 4, 2);
insert into hutest values(8,  'Luan', 7, 2);
insert into hutest values(9,  'Loan', 9, 2);
insert into hutest values(10, 'Nhuan', 9, 2);
insert into hutest values(11, 'Huong', 2, 3);
insert into hutest values(12, 'Cau', 1, 3);
insert into hutest values(13, 'Huu Anh', 2, 3);
insert into hutest values(14, 'Hieu', 5, 3);
insert into hutest values(15, 'Hung', 17, 3);
insert into hutest values(16, 'A', 3, 4);
insert into hutest values(17, 'B', 1, 4);
insert into hutest values(18, 'C', 2, 4);
commit;
select no,name from (
  select no,name,
         row_number() over (partition by groupid order by groupsumrunning) rn
    from (
      select no,name,groupid,
             sum(quantity) over (partition by groupid order by no) groupsumrunning
      from hutest)
   where groupsumrunning >= 10)
where rn = 1;