SQL query to compare product sales by month

Question

I have a Monthly Status database view I need to build a report based on. The data in the view looks something like this:

Category | Revenue  |  Yearh  |  Month
B         


        

Answer 1

Using pivot and Dynamic Sql we can achieve this result

SET NOCOUNT ON
IF OBJECT_ID('TEMPDB..#TEMP') IS NOT NULL
DROP TABLE #TEMP

;With cte(Category , Revenue  ,  Yearh  ,  [Month])
AS
(
SELECT 'Bikes', 10000, 2008,1 UNION ALL
SELECT 'Bikes', 12000, 2008,2 UNION ALL
SELECT 'Bikes', 12000, 2008,3 UNION ALL
SELECT 'Bikes', 15000, 2008,1 UNION ALL
SELECT 'Bikes', 11000, 2007,2 UNION ALL
SELECT 'Bikes', 11500, 2007,3 UNION ALL
SELECT 'Bikes', 15400, 2007,4
)
SELECT * INTO #Temp FROM cte

Declare @Column nvarchar(max),
        @Column2 nvarchar(max),
        @Sql nvarchar(max)


SELECT @Column=STUFF((SELECT DISTINCT ','+ 'ISNULL('+QUOTENAME(CAST(Yearh AS VArchar(10)))+','+'''0'''+')'+ 'AS '+ QUOTENAME(CAST(Yearh AS VArchar(10)))
FROM #Temp order by 1 desc FOR XML PATH ('')),1,1,'')

SELECT @Column2=STUFF((SELECT DISTINCT ','+ QUOTENAME(CAST(Yearh AS VArchar(10)))
FROM #Temp FOR XML PATH ('')),1,1,'')

SET @Sql= N'SELECT Category,[Month],'+ @Column +'FRom #Temp
            PIVOT
            (MIN(Revenue) FOR yearh IN ('+@Column2+')
            ) AS Pvt

            '
EXEC(@Sql)
Print @Sql

Result

Category    Month   2008    2007
----------------------------------
Bikes       1       10000   0
Bikes       2       12000   11000
Bikes       3       12000   11500
Bikes       4       0       15400