sql server cross join - sql-server-2008

Question

I have the following query:
select
tt.ItemOrder, tt.DisplayVal as Task, tt.Responsible as ResParty,
tt.DaysDue,
ActualDate = (select convert(varchar(10), cnfmdate, 101) from ProSer where PId = #PID), PDate = #PDate
from
tblTimeline tt
where
tt.ID = 1
What I need to do is to put it in a view such that I can call the view simply using the PID.
I came up with the following and used the cross join:
create view view1 as
select
ps.PID, tt.ID, tt.ItemOrder, tt.DisplayVal as Task,
tt.Responsible as ResParty, tt.DaysDue,
ps.cnfmdate As ActualDate, ProgStartDate as ProgramDate
from
tblTimeline tt
cross join
ProSer ps
where
tt.ID = 1 and ps.cancelled = 0
Notice now, I can do the following
select *
from view1
where PID = '34343'
and then I can retrieve it from the view.
Now, I am not sure how to do similiarly with the following in which case I need to put it in a cross join similarly to how I did above.
Notice how actual date is somehat more involved. I need to use the cross table similarly to how I did it above but not as you can see, it is somewhat more involved.
(notice for this part, I will simly join to the view1 that I have above with UNION
select
tt.ItemOrder, tt.DisplayVal as Task, tt.Responsible as ResParty,
ActualDate = (
CASE
WHEN
NOT EXISTS(SELECT * FROM Spls WHERE RequestRcvd = 1 AND PID = #PID)
THEN
'N/A'
WHEN EXISTS (SELECT * FROM spls WHERE RequestRcvd = 1 AND RequestRcvdDate IS NOT NULL)
THEN
(SELECT CONVERT(VARCHAR(10),MAX(RequestRcvdDate),101) from spls WHERE RequestRcvd = 1 AND PID = #PID)
END
)
from
tblTimeline tt
where
tt.ID = 9
I need to know how I can create this in a cross join (which will be inside of a view) such that I can do the following similarly to how I did the above one
select *
from view1
where PID = '34343'
and then I can retrieve it from the view.

Answer 1

There might be a way to simplify the query, but the following should work:
select p.pid, tt.ItemOrder, tt.DisplayVal as Task,
tt.Responsible as ResParty,
ActualDate = (CASE WHEN NOT EXISTS(SELECT * FROM Spls WHERE RequestRcvd = 1 AND spls.PID = p.PID)
THEN 'N/A'
WHEN EXISTS (SELECT * FROM spls WHERE RequestRcvd = 1 AND RequestRcvdDate IS NOT NULL)
THEN (SELECT CONVERT(VARCHAR(10),MAX(RequestRcvdDate),101) from spls WHERE RequestRcvd = 1 AND spls.PID = p.PID)
END)
from tblTimeline tt cross join
poser p
where tt.ID = 9
All I did was add the cross join to poser and replace #PID with p.pid. The results is a subquery that contains a reference to a table at an outer level. Such a subquery is called a correlated subquery.