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Select dynamic rows as columns?

Hi,

I have a CTE that selects two sets of data. One called Months that will return back the last year worth of months, for example:

2015-07
2015-08
2015-09
2015-10
2015-11
2015-12
2016-01
2016-02
2016-03
2016-04
2016-05
2016-06
2016-07

Another, contains the core data that returns data in the below column format:

ClientID MonthPeriod Spending
0001 2015-7 120.11
0001 2015-9 190.34
0001 2015-10 100.10
0001 2016-2 140.05

How do i query the above to so that it returns in the following format dynamically:

ClientID 2015-7 2015-8 2015-9 2015-10 2015-11 2015-12 2016-01 2016-02
0001 120.11 0.00 190.34 100.10 0.00 0.00 0.00 140.05

SOLUTION

Manuel Marienne-Duchêne

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Dung Dinh

The PIVOT is one of options for you. You can try with below before applying the dynamic PIVOT

WITH Months([Month] ,MonthOrder) As
(
 SELECT '2015-07',1
 UNION
 SELECT '2015-08',2
 UNION
 SELECT '2015-09',3
 UNION
 SELECT '2015-10',4
 UNION 
 SELECT '2015-11',5
 UNION
 SELECT '2015-12',6
 UNION
 SELECT '2016-01',7
 UNION
 SELECT '2016-02',8
 UNION
 SELECT '2016-03',9
 UNION
 SELECT '2016-04',10
 UNION
 SELECT '2016-05',11
 UNION
 SELECT '2016-06',12
 UNION
 SELECT '2016-07',13
)
,Sales(CustomerID,[Month],SalesAmount) AS
(
 SELECT '0001','2015-07',120.11
 UNION
 SELECT '0001','2015-09',190.34
 UNION
 SELECT '0001','2015-10',100.10
 UNION
 SELECT '0001','2016-02',140.05
 UNION
 SELECT '0002','2015-09',150.05 
)
,Report(CustomerID,[Month],SalesAmount) AS
(
   
   SELECT tmp.CustomerID,tmp.Month,ISNULL(s.SalesAmount,0.00) As SalesAmount
   FROM 
   (
       SELECT s.CustomerID,m.Month,0.00  SalesAMount
       FROM (SELECT DISTINCT CustomerID FROM Sales) s
           CROSS JOIN Months m 
   ) tmp
   LEFT JOIN Sales s ON tmp.CustomerID = s.CustomerID AND tmp.Month = s.Month
)
SELECT [CustomerID], [2015-07],[2015-08],[2015-09],[2015-10],[2015-11],[2015-12],[2016-01],
          [2016-02],[2016-03],[2016-04],[2016-05],[2016-06],[2016-07]
FROM Report r
     PIVOT
     (
       SUM(r.SalesAmount)
       FOR r.Month IN ([2015-07],[2015-08],[2015-09],[2015-10],[2015-11],[2015-12],[2016-01],
                       [2016-02],[2016-03],[2016-04],[2016-05],[2016-06],[2016-07])
     ) AS pv;

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ASKER CERTIFIED SOLUTION

Jose Torres

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