获取日期范围内第一个和最后一个度量值之间的差异-MDX

Question

I want to get the first value and last value of a selected measure between a specified date range. Example: If I have a query that returns values between 10 Nov and 17 Nov, I want to subtract the value at 17 Nov from the value at 10 Nov. I tried using tail() and head() functions but it still not working.

Answer 1

SELECT MAX(t.Col) - MIN(t.Col)
FROM yourTable t

The statement returns the difference between max and min values on column Col. The statement can be further used as a subquery in various clauses such as where or select. If the column Col is a date-related one then the difference computed will reflect the number of days between min an max.