SQL Server: Round values of dynamic columns

Question

I have a question relating to round values from dynamic columns.

I am dynamically (Over past X days) creating a list of player with their daily score and I would like to round these scores with this kind of format ROUND(Score, 2). Here is my query:

DECLARE @Column AS NVARCHAR(MAX),
        @SQL    AS NVARCHAR(MAX)

SELECT  [Player], [Start], [Average]
INTO #DbTemp1
FROM [PlayerScoreByWeek]
WHERE [Start] >= DateAdd(DAY, -7, GETDATE())

SELECT @Column = STUFF((SELECT ',' + QUOTENAME([Start])
                    FROM        #DbTemp1
                    GROUP BY    [Start]
                    ORDER BY    [Start] FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')

SET @SQL = 'SELECT [Player],' + @Column + '
                INTO #DbTemp2
                FROM
                (
                    SELECT [Player], [Start], [Average]
                    FROM #DbTemp1
                ) AS SourceTable
                PIVOT
                (
                    AVG([Average])
                    FOR [Start] IN (' + @Column + ')
                ) AS PivotTable
                ORDER BY Len([Player]), Player
                SELECT * FROM #DbTemp2'
EXECUTE(@SQL)

The current output is as follows:

Player    2014-02-24    2014-02-25    2014-02-26    2014-02-27    2014-02-28    2014-03-01    2014-03-02 
------    ----------    ----------    ----------    ----------    ----------    ----------    ----------
Carl       26.21654      55.1542       12.29612      29.16546       32.4556      21.1485        48.3652
Gene       46.13444      29.3298       16.31642      12.86592       65.6235      52.8525        31.5915
Kim        25.69554      39.5986       32.23184      34.55685       59.2125      12.2316        29.1242         

And this is the desired output:

Player    2014-02-24    2014-02-25    2014-02-26    2014-02-27    2014-02-28    2014-03-01    2014-03-02 
------    ----------    ----------    ----------    ----------    ----------    ----------    ----------
Carl        26.22          55.15        12.30         29.17          32.46         21.14        48.37
Gene        46.13          29.33        16.32         12.87          65.62         52.85        31.59
Kim         25.70          39.60        32.23         34.56          59.21         12.23        29.12  

Given that the columns are created dynamically it is not possible to use the round function inside the '@SQL' query. Thanks for your help !

Answer 1

Create another variable for your outputs - eg:

DECLARE @Column AS NVARCHAR(MAX), @Output nvarchar(max), @SQL    AS NVARCHAR(MAX)

SELECT  [Player], [Start], [Average] INTO #DbTemp1 FROM [PlayerScoreByWeek] 
WHERE [Start] >= DateAdd(DAY, -7, GETDATE())

SELECT @Column = STUFF((SELECT ','+ QUOTENAME([Start])
                FROM        #DbTemp1
                GROUP BY    [Start]
                ORDER BY    [Start] FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,''),
       @Output = STUFF((SELECT ', round('+ QUOTENAME([Start])+',2) as ' + QUOTENAME([Start])
                FROM        #DbTemp1
                GROUP BY    [Start]
                ORDER BY    [Start] FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'),1,1,'')


SET @SQL = 'SELECT [Player],' + @Output + '
            INTO #dbTemp2            
            FROM
            (
                SELECT [Player], [Start], [Average]
                FROM #DbTemp1
            ) AS SourceTable
            PIVOT
            (
                AVG([Average])
                FOR [Start] IN (' + @Column + ')
            ) AS PivotTable
            ORDER BY Len([Player]), Player;
            select * from #DbTemp2'
 EXECUTE(@SQL)