SQL Server: Rows to Columns with Case - sql

Question

I have a table with 2 columns:
CREATE TABLE Prop_Cl
(
Id int,
ClId int
);
INSERT INTO Prop_Cl
(Id, ClId)
VALUES
(1, 1111111),
(1, 1111112),
(1, 1111113),
(2, 2222221),
(3, 3333331),
(3, 3333332);
ID CLID
1 1111111
1 1111112
1 1111113
2 2222221
3 3333331
3 3333332
I'm trying to show this table in that way:
ID CLIENT 1 CLIENT 2 CLIENT 3 CLIENT 4
1 1111111 1111112 1111113 0
2 2222221 0 0 0
3 3333331 3333332 0 0
with this statement:
SELECT p.Id,
CASE WHEN (ROW_NUMBER() OVER(PARTITION BY p.Id ORDER BY p.Id)) = 1 THEN p.ClId ELSE 0 END AS 'Client 1',
CASE WHEN (ROW_NUMBER() OVER(PARTITION BY p.Id ORDER BY p.Id)) = 2 THEN p.ClId ELSE 0 END AS 'Client 2',
CASE WHEN (ROW_NUMBER() OVER(PARTITION BY p.Id ORDER BY p.Id)) = 3 THEN p.ClId ELSE 0 END AS 'Client 3',
CASE WHEN (ROW_NUMBER() OVER(PARTITION BY p.Id ORDER BY p.Id)) = 4 THEN p.ClId ELSE 0 END AS 'Client 4'
FROM Prop_Cl p
But I get this result:
ID CLIENT 1 CLIENT 2 CLIENT 3 CLIENT 4
1 1111111 0 0 0
1 0 1111112 0 0
1 0 0 1111113 0
2 2222221 0 0 0
3 3333331 0 0 0
3 0 3333332 0 0
I can't use PIVOT function because of my Sql Server realisation.
There are maximum 4 clients in each ID.
Any ideas?
SQL Fiddle

Answer 1

I would change the syntax slightly to use an aggregate function and a subquery similar to:
select id,
max(case when seq = 1 then ClId else 0 end) Client1,
max(case when seq = 2 then ClId else 0 end) Client2,
max(case when seq = 3 then ClId else 0 end) Client3,
max(case when seq = 4 then ClId else 0 end) Client4
from
(
select Id, ClId,
ROW_NUMBER() OVER(PARTITION BY Id ORDER BY Id) seq
from Prop_Cl
) s
group by id;
See SQL Fiddle with Demo