Pivot Dynamic row to Column with output parameter? - sql

Question

There is no problem for me to pivot statistic columns in my query e.g Column 1 , Column 2 , Column 3.... and so on.
But i would like to do this dynamic instead.
My data looks like this:
i want to be able to EXECUTE a store procedure to get the output result:
Exec sp_output 1 (from another window where '1' represents the PoolID (#AppPool)) to look like this:
This is my SP:
create PROCEDURE [dbo].[sp_test]
#Query as nvarchar(100) -- OUTPUT?,
#AppPool AS nvarchar(50)
AS
SELECT #Query = Attribute FROM [dbo].[Vy_UserAccess] WHERE PoolID = #AppPool
SELECT [Users],'+ #Query +' FROM
(SELECT [Pool],[Users],[RecNum],[Attribute],[Values] FROM [dbo].[Vy_UserAccess] ) AS T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ #Query +')) AS T2
Is this possible to achieve by just fine tuning my code or do i have to go on another direction?

Answer 1

You can do It in following:
QUERY
CREATE PROCEDURE [dbo].[sp_test]
#AppPool AS NVARCHAR(60)
AS
DECLARE #cols AS NVARCHAR(MAX) = '',
#sql AS NVARCHAR(MAX)
SELECT #cols += QUOTENAME([Name]) + ','
FROM (SELECT DISTINCT Attribute as Name
FROM [dbo].[Vy_UserAccess]
WHERE PoolID = #AppPool
) a
ORDER BY Name DESC
SET #cols = LEFT(#cols, LEN(#cols) - 1)
SET #sql = 'SELECT Users, ' + #cols + ' FROM
(
SELECT [Pool],[Users],[RecNum],[Attribute],[Values]
FROM [dbo].[Vy_UserAccess]
) AS T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ #cols +')) AS T2'
EXEC sp_executesql #sql, N'#AppPool NVARCHAR(60)', #AppPool
EXECUTION
Exec sp_test 1
QUERY WITH SAMPLE DATA
CREATE PROCEDURE sp_test
#AppPool AS NVARCHAR(60)
AS
CREATE TABLE #test
(
PoolId NVARCHAR(60),
Pool NVARCHAR(40),
Users NVARCHAR(60),
RecNum INT,
Attribute NVARCHAR(40),
[Values] NVARCHAR(20)
)
INSERT INTO #test VALUES
('1', 'FINANCE', 'User1', 2, 'DIVISION', '010'),
('1', 'FINANCE', 'User1', 1, 'COMPANY', '1'),
('1', 'FINANCE', 'User1', 1, 'DIVISION', '050')
DECLARE #cols AS NVARCHAR(MAX) = '',
#sql AS NVARCHAR(MAX)
SELECT #cols += QUOTENAME([Name]) + ','
FROM (SELECT DISTINCT Attribute as Name
FROM #test
WHERE PoolID = #AppPool
) a
ORDER BY Name DESC
SET #cols = LEFT(#cols, LEN(#cols) - 1)
SET #sql = 'SELECT Users, ' + #cols + ' FROM
(
SELECT [Pool],[Users],[RecNum],[Attribute],[Values]
FROM #test
) AS T1
PIVOT (MAX([Values]) FOR [ATTRIBUTE] IN ('+ #cols +')) AS T2'
EXEC Sp_executesql #sql, N'#AppPool NVARCHAR(60)', #AppPool
DROP TABLE #test
OUTPUT
Users DIVISION COMPANY
User1 050 1
User1 010 NULL