Problem in query in sql server 2008 - sql-server

Question

I have a table called album with the following columns:
Album_Id, User_Id, Report_Id, PhotoName
There are different Photoname on a User_Id and Report_Id combination
Like:
Album_Id User_Id Report_Id PhotoName
1 1 16 A.jpg
2 1 16 B.jpg
3 2 17 C.jpg
4 2 17 D.jpg
I just want to retrieve data in format
User_Id Report_Id PhotoName1 PhotoName2
1 16 A.jpg B.jpg
2 17 C.jpg D.jpg
Max Photos are 4...

Answer 1

WITH cte
AS ( SELECT * ,
ROW_NUMBER() OVER ( PARTITION BY User_Id, Report_Id ORDER BY Album_Id ) AS RN
FROM T
)
SELECT User_Id ,
Report_Id ,
MAX(CASE WHEN RN = 1 THEN PhotoName
END) AS PhotoName1 ,
MAX(CASE WHEN RN = 2 THEN PhotoName
END) AS PhotoName2 ,
MAX(CASE WHEN RN = 3 THEN PhotoName
END) AS PhotoName3 ,
MAX(CASE WHEN RN = 4 THEN PhotoName
END) AS PhotoName4
FROM cte
GROUP BY User_Id ,
Report_Id

Answer 2

SELECT a.User_Id, a.Report_Id, a.PhotoName as 'PhotoName1', a2.PhotoName as 'PhotoName2', a3.PhotoName as 'PhotoName3', a4.PhotoName as 'PhotoName4'
FROM album a
LEFT JOIN album a2 on a2.User_Id = a.User_Id and a2.Report_Id = a.Report_Id AND a2.Album_Id != a.Album_Id
LEFT JOIN album a3 on a3.User_Id = a.User_Id and a3.Report_Id = a.Report_Id AND a3.Album_id NOT IN (a.Album_Id, a2.Album_Id)
LEFT JOIN album a4 on a4.User_Id = a.User_Id and a4.Report_Id = a.Report_Id AND a4.Album_id NOT IN (a.Album_Id, a2.Album_Id, a3.Album_Id)
ORDER BY a.User_Id, a.Report_Id ASC;