This IS Self-join Friday, Isn't It?

Hi all...I'm still trying to figure out a query related to the topic I posted yesterday about the table scan...got past that...it was smoke and mirrors...

Now...I have a table that looks like (essentially) this:
BegDate (smalldatetime)
EndDate (smalldatetime)
PortfolioID (int)
WklyPerPriceChg (float)

I am trying to come up with a query that returns a table that looks like this:
BegDate, EndDate, WklyPerPriceChg for PortfolioID1, WklyPerPriceChg for PortfolioID2, WklyPerPriceChg for PortfolioID3, WklyPerPriceChg for PortfolioID4

Here is my select:SELECT TOP 100 PERCENT
T.BegDate as StartDate,
T.EndDate as EndDate,
SP.WklyPerPriceChg as Sandp,
WR.WklyPerPriceChg as WeekRvw,
NA.WklyPerPriceChg as NewAm,
T.WklyPerPriceChg as T100
FROMdbo.WeeklyPortfolioIndex T (nolock) INNER JOIN
dbo.WeeklyPortfolioIndex WR (nolock) ON T.BegDate = WR.BegDate INNER JOIN
dbo.WeeklyPortfolioIndex NA (nolock) ON T.BegDate = NA.BegDate INNER JOIN
dbo.WeeklyPortfolioIndex SP (nolock) ON T.BegDate = SP.BegDate
WHERE((T.BegDate >= @FirstBegDate) AND
(T.EndDate <= @LastEndDate)) AND
SP.PortfolioID = 2 AND
WR.PortfolioID = 67 AND
NA.PortfolioID = 11 AND
T.PortfolioID = 90
ORDER BY T.BegDate DESC

I think you can disregard the date stuff that seems to be working.

What I am finding though, is that the self-join only returns rows for dates that have ALL FOUR of the target portfolioID's. What I want is a row for any day that has AT LEAST ONE of the portfolios, and would like NULL or zero returned in the columns for any portfolioID that does NOT have a row present in the table for that date(range).

I thought I would try a FULL OUTER join rather than the inner one (which I would expect to return an output row if ALL portfolio rows were present for that day)...but that returns more of a cartesian product type thang rather than what I am looking for.

I further thought I need something like a GROUP BY T.BegDate, for example, but then it complains that my select columns are not aggregates.

I know this should be fairly easy...I'm just missing the boat by mere inches, I think...

And missing by "mere inches" is still enough to leave me all wet ;)
Thoughts?
Thanks!