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

Give this a shot...

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

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

--==========================================================

DECLARE 
    @PivotColumns NVARCHAR(4000),
    @sql NVARCHAR(4000),
    @DeBug BIT = 0;

SELECT 
    @PivotColumns = CONCAT(@PivotColumns, N',
    ', QUOTENAME(td.Model), N' = SUM(CASE WHEN td.Model = ', QUOTENAME(td.Model, ''''), N' THEN td.SomeCount END)') 
FROM
    #TestData td
GROUP BY
    td.Model
-- ORDER BY ??? if you want the columns in a specific ordinal position.
;

SET @sql = CONCAT(N'
SELECT 
    td.[Site]',
    @PivotColumns, N'
FROM
    #TestData td
GROUP BY
    td.[Site];');

IF @DeBug = 1
BEGIN 
    PRINT (@sql);
END;
ELSE 
BEGIN 
    EXEC sys.sp_executesql @sql;
END;

Results...

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