sql calculate sum

I need to calculate sum of cars that are less than 12 month old, 12-24 month old , 24+ month old

THe table structure is simple

Car:
carID
dateadded
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erikTsomikSystem Architect, CF programmer Asked:
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Jim HornMicrosoft SQL Server Data DudeCommented:
>I need to calculate sum of cars
By any chance do you mean count of cars? 
Declare @dt datetime = GETDATE()
SELECT 
   SUM(CASE WHEN dateadded >= DATEADD(month, -12, @dt) AND dateadded < @dt THEN 1 ELSE 0 END) as less_than_12_months_old, 
   SUM(CASE WHEN dateadded >= DATEADD(month, -24, @dt) AND dateadded < DATEADD(month, -12, @dt) THEN 1 ELSE 0 END) as between_12_and_24months_old, 
   SUM(CASE WHEN dateadded < DATEADD(month, -24, @dt) THEN 1 ELSE 0 END) as older_than_24_months_old
FROM Car

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This methodology and other things to do with CASE is illustrated in my EE article SQL Server CASE Solutions.
erikTsomikSystem Architect, CF programmer Author Commented:
Yes I Need the total
Jim HornMicrosoft SQL Server Data DudeCommented:
< slight correction to my first post.  To conditionally count using a CASE block it's SUM(WHEN expression THEN 1 ELSE 0 END >
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erikTsomikSystem Architect, CF programmer Author Commented:
I am getting the same number for all 3 ranges 

Declare @dt datetime = GETDATE()


SELECT 
	COUNT (CASE WHEN SM.dateadded >= DATEADD(month, -12, @dt) AND SM.dateadded < @dt THEN 1 ELSE 0 END) as less_than_12_months_old, 
   COUNT (CASE WHEN SM.dateadded >= DATEADD(month, -24, @dt) AND SM.dateadded < DATEADD(month, -12, @dt) THEN 1 ELSE 0 END) as between_12_and_24months_old, 
   COUNT (CASE WHEN SM.dateadded < DATEADD(month, -24, @dt) THEN 1 ELSE 0 END) as older_than_24_months_old
	from SessionMap SM
	inner join orders O on O.orderKey = SM.orderKey
	where (SM.sessionKey = 0 OR  SM.userKey  = 0) and SM.type = 'BW'  
	--and O.orderDate > DATEADD(MONTH,-12,GETDATE())
	AND O.void <> 'Y'

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Jim HornMicrosoft SQL Server Data DudeCommented:
Use SUM instead of COUNT .. corrected my first post.
erikTsomikSystem Architect, CF programmer Author Commented:
can i also segregate by state . The column is availStateKey

if availStateKey = 1 or 3  maryland, availStateKey = 2 -virginia,availstateKey = 4 california

Declare @dt datetime = GETDATE()


SELECT 
	SUM (CASE WHEN SM.dateadded >= DATEADD(month, -12, @dt) AND SM.dateadded < @dt THEN 1 ELSE 0 END) as less_than_12_months_old, 
   SUM (CASE WHEN SM.dateadded >= DATEADD(month, -24, @dt) AND SM.dateadded < DATEADD(month, -12, @dt) THEN 1 ELSE 0 END) as between_12_and_24months_old, 
   SUM (CASE WHEN SM.dateadded < DATEADD(month, -24, @dt) THEN 1 ELSE 0 END) as older_than_24_months_old
   
	from SessionMap SM
	inner join orders O on O.orderKey = SM.orderKey
	where (SM.sessionKey = 0 OR  SM.userKey  = 0) and (SM.type = 'BW' or SM.type = 'SBW')  
	--and O.orderDate > DATEADD(MONTH,-12,GETDATE())
	AND O.void <> 'Y'
	GROUP BY O.availStateKey

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Mike EghtebasDatabase and Application DeveloperCommented:
Also try: 
Select HowOld, count(HowOld) As Qty
From (Select 
	  Case 
	   when datediff(Month, dateadded, getdate()) < 12 then '<12'
	   when datediff(Month, dateadded, getdate()) between 12 and 24 then '12-24'
	   else '>24' End As HowOld
      From #w) As D (HowOld) 
Group By HowOld

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replace #w with your table name.  Revised
erikTsomikSystem Architect, CF programmer Author Commented:
Are there any suggestions how to split the response by state
Mike EghtebasDatabase and Application DeveloperCommented:
please revise this table to include state data. Or, provide a better sample data:
carID  dateAdded
1      2015-10-01
2      2014-06-01
3      2012-08-01
4      2012-08-01


will respond in a few hours unless someone else beats me to it.
Jim HornMicrosoft SQL Server Data DudeCommented:
>Are there any suggestions how to split the response by state
Two responses:

1  We've already answered your question as asked, so now we're answering new requirements as a follow-on question, and there's a limit to how engaged experts will be, especially if we start wondering how many more follow-on questions there are.  For a humorous example see  ​Top 10 Ways to Ask Better Questions, Number Three

2  Subquery to handle the state logic, then build on the first solution for the SUM's. 
Declare @dt datetime = GETDATE()

SELECT a.state_code,  
   SUM (CASE WHEN a.dateadded >= DATEADD(month, -12, @dt) AND a.dateadded < @dt THEN 1 ELSE 0 END) as less_than_12_months_old, 
   SUM (CASE WHEN a.dateadded >= DATEADD(month, -24, @dt) AND a.dateadded < DATEADD(month, -12, @dt) THEN 1 ELSE 0 END) as between_12_and_24months_old, 
   SUM (CASE WHEN a.dateadded < DATEADD(month, -24, @dt) THEN 1 ELSE 0 END) as older_than_24_months_old
 FROM (
   SELECT CASE availStateKey 
      WHEN 1 THEN 'MD' WHEN 2 THEN 'VA' 
      WHEN 3 THEN 'MD' WHEN 4 THEN 'CA' END as state_code, 
   dateadded
   FROM Cars) a
GROUP BY a.state_code
ORDER BY a.state_code

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erikTsomikSystem Architect, CF programmer Author Commented:
Great. Thank you
PortletPaulEE Topic AdvisorCommented:
I would just like to clarify something.

If you want to count something conditionally you can use COUNT()

This would be accurate:
COUNT (
      CASE
            WHEN SM.dateadded >= DATEADD(month, -12, @dt) AND SM.dateadded < @dt
            THEN 1
      END
) as less_than_12_months_old

This however would NOT be accurate:
COUNT (
      CASE
            WHEN SM.dateadded >= DATEADD(month, -12, @dt) AND SM.dateadded < @dt
            THEN 1
            ELSE 0
      END
) as less_than_12_months_old

The aggregate function COUNT() increments for EVERY NON-NULL value.

So, when using COUNT()
do NOT include "else some-value-here"
Jim HornMicrosoft SQL Server Data DudeCommented:
Correct.  Good catch Paul.  -Jim
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