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Posted on 2016-07-26
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I have a table with 3 columns

I prefer to do this with a pivit query if possible?

I need a count of individuals by month by for each CustIDl
There are 1.5 Million records and growing (25k per year) in the table

Example
CustID   Jan   Feb   etc...
1             10     11   ....
0
Question by:lrbrister

LVL 27

Accepted Solution

Shaun Kline earned 2000 total points
ID: 41729692
Here is a sample query:
``````DECLARE @Test TABLE
(
CustID INT,
IndividualID INT,
)

INSERT INTO @Test ( CustID, IndividualID, DateAdded )
VALUES ( 1, 1, '2016-01-01'),
( 1, 2, '2016-01-15'),
( 1, 3, '2016-02-01'),
( 1, 4, '2016-02-15'),
( 1, 5, '2016-02-28'),
( 1, 6, '2016-03-04'),
( 1, 7, '2016-03-12'),
( 1, 8, '2016-03-16'),
( 1, 9, '2016-03-31'),
( 1, 10, '2016-04-04'),
( 1, 21, '2015-12-25'),
( 1, 22, '2015-11-30'),
( 2, 11, '2016-01-03'),
( 2, 12, '2016-02-02'),
( 2, 13, '2016-02-05'),
( 2, 14, '2016-02-15'),
( 2, 15, '2016-02-21'),
( 2, 16, '2016-02-24'),
( 2, 17, '2016-03-12'),
( 2, 18, '2016-03-16'),
( 2, 19, '2016-03-31'),
( 2, 20, '2016-04-04'),
( 2, 23, '2014-10-31'),
( 2, 24, '2013-09-09')

SELECT CustID, [1] Jan, [2] Feb, [3] Mar, [4] Apr
FROM (
FROM @Test
) Data
PIVOT (COUNT(IndividualID) FOR MonthAdded IN ([1], [2], [3], [4])) Pvt
``````

It is only putting out the first four months, but you should be able to extend it to your needs.

One concern is the performance of PIVOT on the volume of data in your table. You may be better off using this PIVOT type query:
``````SELECT CustID,
SUM(CASE WHEN MONTH(DateAdded) = 1 THEN 1 ELSE 0 END) Jan,
SUM(CASE WHEN MONTH(DateAdded) = 2 THEN 1 ELSE 0 END) Feb,
SUM(CASE WHEN MONTH(DateAdded) = 3 THEN 1 ELSE 0 END) Mar,
SUM(CASE WHEN MONTH(DateAdded) = 4 THEN 1 ELSE 0 END) Apr
FROM @Test
GROUP BY CustID
``````
0

Author Closing Comment

ID: 41729718
Because I am filtering on a Type code thie Pivot works very well.
There will never be an all "everything" select on this.

Here is my final code... thanks

;
WITH    cte
AS ( SELECT   OriginID ,
[1] Jan ,
[2] Feb ,
[3] Mar ,
[4] Apr ,
[5] May ,
[6] Jun ,
[7] Jul ,
[8] Aug ,
[9] Sept ,
[10] Oct ,
[11] Nov ,
[12] Dec
FROM     ( SELECT    o.OriginID ,
i.IndividualID ,
FROM      Individuals i
JOIN dbo.IndividualOrigins o ON o.IndividualID = i.IndividualID
JOIN Origins og ON og.OriginID = o.OriginID
AND i.DateAdded < GETDATE() + 1
AND o.OriginID IN ( 7867, 8907, 10100,
10130, 10132, 10146,
10151, 10157, 12271 )
) Data PIVOT ( COUNT(IndividualID) FOR MonthAdded IN ( [1],
[2], [3], [4],
[5], [6], [7],
[8], [9], [10],
[11], [12] ) ) Pvt
)
SELECT  o.OriginName ,c.*
FROM    cte c
JOIN Origins o ON o.OriginID = c.OriginID
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