SQL Query with Dynamic Columns Using Pivot

Question

I know this topic is everywhere but I couldn\'t get it to work properly. It\'s probably something very simple.

Here is a sample of the data after a basic query:

Answer 1

Using Dynamic Sql

IF OBJECT_ID('tempdb..#TempData', 'U') IS NOT NULL 
DROP TABLE #TempData;

CREATE TABLE #TempData (
    [Site] CHAR(3) NOT NULL,
    Model VARCHAR(30) NOT NULL,
    SomeCount INT NOT NULL DEFAULT(0)
    );
INSERT #TempData (Site, Model, SomeCount) VALUES
    ('AAA', 'ProLiant DL380 G7', 1), 
    ('AAA', 'OptiPlex 790', 500), 
    ('BBB', 'OptiPlex 780', 80),
    ('CCC', 'OptiPlex 790', 23);

Declare @DynamicCol nvarchar(max),@DynamicColNull nvarchar(max)
        ,@Sql nvarchar(max)

SELECT @DynamicColNull=STUFF((SELECT DISTINCT ', '+'ISNULL('+QUOTENAME(Model),','+'''0'''+') As '+QUOTENAME(Model)
                        FROM #TempData FOR XML PATH ('')),1,2,'')

SELECT @DynamicCol=STUFF((SELECT DISTINCT ', '+QUOTENAME(Model) FROM #TempData FOR XML PATH ('')),1,2,'')

SET @Sql='SELECT [Site], '+@DynamicColNull+' From
            (   
            SELECT * from #TempData
            )
            AS Src
            PIVOT
            (
            MAX(SomeCount) FOR [Model] IN ('+@DynamicCol+')
            )AS Pvt'
PRINT @Sql
EXEC(@Sql)

Result

Site    OptiPlex 780    OptiPlex 790    ProLiant DL380 G7
AAA         0               500             1
BBB         80              0               0
CCC         0               23              0