Question

Table: FooData

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

I want to fetch the record that sum of Count column is greater than a certain percentage like 90.

For this example, the sum of all the records is 189, and 90% of it is 170.1, we can see the sum from ID 1 to 6 is 179, and it is greater than 170.1 so the record ID 6 should be returned.

btw, temporary table is not allowed because I need to do it in a function.

Answer 1

Try this:

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)

But also be aware of the potential performance issue with triangular joins in running totals.