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count number of orders in 6 month intervals

I am trying to create a query\procedure that will show the total number of orders from a selected customer in 6 month intervals. For 6, 12, 18 and 24 months. Please show a step by step.

example if abc company order 6 times from Jan to Jun and 4 times from Jul-Dec then i want the report to show

company    6_Months    12_Months
acbc                   6                  10 <----- Rolling sum

I am using microsoft sql server 14
0
cskehan
Asked:
cskehan
1 Solution
 
Kyle AbrahamsSenior .Net DeveloperCommented:
declare @date = DATEADD(d,0,DATEDIFF(d,0,GETDATE()))   -- today at midnight)

select company, 
-- if order is >= 6 months prior to today, add 1, else don't add anything end
sum (case when order_date >= dateadd(m, -6, @date) then 1 else 0 end) 6_Months,
sum (case when order_date >= dateadd(m, -12, @date) then 1 else 0 end) 12_Months
from 
where company = @company
group by company
<table>

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1
 
cskehanAuthor Commented:
Had to do a little tweaking to code, but you got me in the right directions. Thanks!!
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Olaf DoschkeSoftware DeveloperCommented:
You might also look into my solution of a similar problem at https://www.experts-exchange.com/questions/28963238/SQL-sum-months-quarter-YTD.html#a41756192

Bye, Olaf
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