how to sum measurement between dates

[#1]

Hi

I have to dates ( from , to)

I want to add a calculate column to a table that , sum the measurement  from date to date

for example :

my table present 04.2013 data

i have to variable (04.2013 and 05.2012)

i want to present column that sum the the measurement for all 12 month .

how do i do it ?

thank you

[#2]

Hey Mohit,

First, thank you for your quick responce. I was looking at your script and would like to understand what were you doing with Sales_ID or Cust_id etc on Main_2 tab. Is this tab is a part of this example?.

Sorry for asking. Since im new and trying to understand your logic.

[#3]

Again Thank you for your smoking fast responce.

[#4]

hi

but how it know to select 12 months