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codingbadger/DynamicPivotSQL.sql

Created October 22, 2015 14:02
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  1. codingbadger created this gist Oct 22, 2015.
    77 changes: 77 additions & 0 deletions DynamicPivotSQL.sql
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    Original file line number Diff line number Diff line change
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    Create Table dbo.ProductInfo
    (
    ProductName varchar(10),
    DateOfSale datetime,
    SaleValue int
    );

    Insert Into dbo.ProductInfo
    Values ('a','2011-05-14',2),
    ('b','2011-05-14',4),
    ('c','2011-05-17',3),
    ('a','2011-05-19',6),
    ('a','2011-05-24',4),
    ('a','2011-05-25',7),
    ('a','2011-05-29',6);


    Declare @cols nvarchar(max),
    @SelectCols nvarchar(max),
    @sql nvarchar(max),
    @StartDate Datetime,
    @EndDate DateTime

    -- Set the date range here
    Set @StartDate = '2011-05-01'
    Set @EndDate = '2012-01-01'

    -- Build up the Pivot colummns using the data from the source table
    select @cols = coalesce(@cols + N',', N'') +
    QUOTENAME(Left(Convert(varchar, DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale),120),10))
    From dbo.ProductInfo
    Where DateOfSale >= @StartDate
    And DateOfSale <= @EndDate
    Group By DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale)

    -- Build up the Pivot colummns using the data from the source table
    select @SelectCols = coalesce(@SelectCols + N',', N'') + N'Sum(IsNull(' +
    QUOTENAME(Left(Convert(varchar, DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale),120),10)) +
    ',0)) As [Week beginning ' +
    Cast(DatePart(Month, DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale)) as CHAR(2)) +
    ' / ' +
    Cast(DatePart(day, DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale)) as CHAR(2)) +
    ']'

    From dbo.ProductInfo
    Group By DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale)


    set @sql = N'
    Select ProductName,
    ' + @SelectCols + '
    From
    (
    Select ProductName,
    DATEPART(week, DateOfSale) as WeekNumber,
    DATEPART(Year, DateOfSale) as YearNumber,
    DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale) as [StartOfWeek],
    SUM(SaleValue) as [TotalSales]
    From dbo.ProductInfo
    Group By ProductName,
    DATEPART(week, DateOfSale) ,
    DATEPART(Year, DateOfSale) ,
    DATEADD(dd, -(DATEPART(dw, DateOfSale)-1), DateOfSale)
    )q
    PIVOT (
    Sum(TotalSales) for StartOfWeek in (' + @cols + ')
    )p
    Group By ProductName'

    Execute (@sql)

    Drop Table dbo.ProductInfo