SQL Rank does not work as expected - sql-server

Question

Im trying to use SQL function Rank() to get a list the top records of several groups. Here is what im tring that does not work :
select hc.hId, hc.DpId, hc.Rank
from (
select d.hId, DpId, Rank()
OVER (Partition by DpId ORDER BY d.hId) AS Rank
FROM CurDp d
INNER JOIN HostList h on d.DpId = h.hId
INNER JOIN Coll_hList pch on d.hId = pch.hId
where h.Model = 'PRIMARY'
) hc where hc.Rank <= 10
I get the top 10 records as follows :
HId | DpId | Rank
-------x------x------
7 | 590 | 1
18 | 590 | 2
23 | 590 | 3
24 | 590 | 4
26 | 590 | 5
36 | 590 | 6
63 | 590 | 7
80 | 590 | 8
84 | 590 | 9
88 | 590 | 10
But when I use CROSS APPLY, which the function I need because i have to get that kind of records on different models, I use this code :
select pch.hId, cc.DpId, cc.Rank from from Coll_hList pch
cross apply
(
select hc.hId, hc.DpId, hc.Rank
from (
select d.hId, DpId, Rank()
OVER (Partition by DpId ORDER BY d.hId) AS Rank
FROM CurrDp d
INNER JOIN HostList h on d.DpId = h.hId
where h.Model = 'PRIMARY' and d.hId = pch.hId
) hc where hc.Rank <= 10
) cc
Here, I get always rank 1, and it doesn't filter anything (not showing the whole result) :
HId | DpId | Rank
-------x------x------
7 590 1
18 590 1
23 590 1
24 590 1
26 590 1
36 590 1
63 590 1
80 590 1
84 590 1
88 590 1
124 590 1
125 590 1
133 590 1
Am I doing it wrong ? Is it because of CROSS APPLY ?
I also used dense_rank() instead of rank(), but it shows the same result.
Any help to achieve this request with CROSS APPLY would be greatly appreciated.
Thanks

Answer 1

In the first case, you join on Coll_hList and get a result set of more than 10 entries which then are ranked.
In the second case, in your apply-sub-select, you only create a one-entry result set. Ranking of that results in rank one.
Your ranking has to be done in the outer statement:
select pch.hId, cc.DpId, Rank()
OVER (Partition by cc.DpId ORDER BY cc.hId) AS Rank
from Coll_hList pch
cross apply
(
select d.hId, DpId
FROM CurrDp d
INNER JOIN HostList h on d.DpId = h.hId
where h.Model = 'PRIMARY' and d.hId = pch.hId
) cc