Question

i have this table

+------+--------+-------------------------+
|  id  | amount | start_date | end_date   |
|   10 |     10 | 2012-01-15 | 2012-01-20 |
|   10 |     12 | 2012-01-14 | 2012-01-15 |
|   10 |     22 | 2012-01-15 | 2012-01-16 |
+------+--------+-------------------------+

i’d wish to find the sum between a given interval.

Example:

start date: 2012-01-13
end date: 2012-01-18
sum(amount) = 44.

start date: 2012-01-18
end date: 2012-01-21
sum(amount) = 10

is that possible with a single query?
is that possible at all?

EDIT
the logic behind is that if the intevarls (given one and inside the table) overlaps, i should get the row.

Answer 1

SELECT SUM(amount)
FROM TableX
WHERE start_date <= @EndDate
  AND @StartDate <= end_date

where @StartDate and @EndDate are the dates you want to check between.