獲取一定的記錄，而以前的記錄的總和大於SQL Server中的百分比

Question

表：FooData

ID   Count
1    54
2    42
3    33
4    25
5    16
6    9
8    5
9    3
10   2

我想獲取Count列的總和大於某個百分比（如90）的記錄。

對於此示例，所有記錄的總和為189，其中90％為170.1，我們可以看到ID 1到6的總和為179，並且它大於170.1，因此應返回記錄ID 6。

順便說一句，臨時表是不允許的，因為我需要在函數中執行它。

Answer 1

三角形聯接的另一個版本。

declare @T table(ID int primary key, [Count] int)
insert into @T values (1, 54), (2, 42), (3, 33),(4, 25), (5, 16), (6, 9), (8, 5), (9, 3),(10, 2)

;with R(ID, [Count], Running) as
(
  select T1.ID, 
         T1.[Count],
         cast(T3.[Count] as float)
  from @T as T1
    cross apply (select sum(T2.[Count])
                 from @T as T2
                 where T1.ID >= T2.ID) as T3([Count])
),
T(Total) as
(
  select sum([Count])
  from @T
)
select top 1 R.ID, R.[Count], R.Running
from R
  inner join T
    on R.Running / T.Total > 0.9
order by R.ID

Answer 2

嘗試這個：

SELECT TOP 1 
  t2.id,
  SUM(t1.value) AS runningTotal
FROM FooData t1 
INNER JOIN FooData t2 
  ON t1.id <= t2.id 
GROUP BY t2.id
HAVING SUM(t1.value) * 100. / 
  (SELECT SUM(value) FROM @FooData) > 90
ORDER BY SUM(t1.value)

但也要注意運行總計中三角形連接的潛在性能問題。