How to include the nulls??

Question

Hi, I have the following query stored:
SELECT     dbo.OrderDetails_Retail.ProductID, dbo.OrderDetails_Retail.ProductName, SUM(dbo.OrderDetails_Retail.Quantity) AS ProdQtyPerWeek, DATEPART(wk,
                      dbo.Orders_Retail.OrderDate) AS SalesWeek, YEAR(dbo.Orders_Retail.OrderDate) AS SalesYear
FROM         dbo.OrderDetails_Retail INNER JOIN
                      dbo.Orders_Retail ON dbo.OrderDetails_Retail.OrderID = dbo.Orders_Retail.OrderID
WHERE     (dbo.Orders_Retail.account = @Account) AND (dbo.Orders_Retail.OrderStatus <> 'Deleted') AND (dbo.Orders_Retail.PayStatus <> 'Pending') AND
                      (dbo.Orders_Retail.OrderStatus <> 'Refunded') AND (DATEDIFF(d, dbo.Orders_Retail.OrderDate, @StartDate) <= 0) AND (DATEDIFF(d,
                      dbo.Orders_Retail.OrderDate, @EndDate) >= 0)
GROUP BY YEAR(dbo.Orders_Retail.OrderDate), DATEPART(wk, dbo.Orders_Retail.OrderDate), dbo.OrderDetails_Retail.ProductID,
                      dbo.OrderDetails_Retail.ProductName
ORDER BY dbo.OrderDetails_Retail.ProductID, dbo.OrderDetails_Retail.ProductName, YEAR(dbo.Orders_Retail.OrderDate), DATEPART(wk,
                      dbo.Orders_Retail.OrderDate)
Basically, it will return a load of results grouped by product for how much qty of that product was sold per week during a date range...
As my client wants to select multiple products at once to compare rather than do it in my application (I'm building something in ASP), I thought I might be able to do it on the database side.
The problem with the above is that.. lets say I select a date range that has weeks 1-4 in it.
Product 1 only sold qty's for weeks 1-2, product 2 sold for only week 3 and product  4 sold in all four weeks.
I'd get
Prod | Qty | Week
1          23     1
1          12     2
2          10     3
3          22      1
3          15       2
3          12       3
3          4         4
Although this looks fine - what I actually need is:
1          23     1
1           12      2
1          0        3
1         0         3
2          0         1
2          0         2
2          10     3
2          0         4
3          22      1
3          15       2
3          12       3
3          4         4
Does that make sense?
Any ideas on how to do this?

Answer 1

ok I'm getting somewhere with this now.. however I have another problem.. here's the current query
SELECT     dbo.Products.ProductID, dbo.Products.ProductName, dbo.Products.ProductBrand, SUM(dbo.OrderDetails_Retail.Quantity) AS Qty, DATEPART(wk,
                      dbo.Orders_Retail.OrderDate) AS SalesWeek, YEAR(dbo.Orders_Retail.OrderDate) AS SalesYear
FROM         dbo.Orders_Retail INNER JOIN
                      dbo.OrderDetails_Retail ON dbo.Orders_Retail.OrderID = dbo.OrderDetails_Retail.OrderID INNER JOIN
                      dbo.Calendar ON CONVERT(datetime, CONVERT(Nvarchar, dbo.Orders_Retail.OrderDate, 102), 102) = CONVERT(datetime, CONVERT(Nvarchar,
                      dbo.Calendar.dt, 102), 102) RIGHT OUTER JOIN
                      dbo.Products ON dbo.OrderDetails_Retail.ProductID = dbo.Products.ProductID
WHERE     (dbo.Orders_Retail.account = @Account) AND (dbo.Orders_Retail.OrderStatus <> '
                       Deleted ') AND
                      (dbo.Orders_Retail.PayStatus <> ' Pending ') AND (dbo.Orders_Retail.OrderStatus <> ' Refunded ') AND (DATEDIFF(d, dbo.Orders_Retail.OrderDate,
                      @StartDate) <= 0) AND (DATEDIFF(d, dbo.Orders_Retail.OrderDate, @EndDate) >= 0)
GROUP BY YEAR(dbo.Orders_Retail.OrderDate), DATEPART(wk, dbo.Orders_Retail.OrderDate), dbo.Products.ProductID, dbo.Products.ProductName,
                      dbo.Products.ProductBrand
ORDER BY YEAR(dbo.Orders_Retail.OrderDate), DATEPART(wk, dbo.Orders_Retail.OrderDate), dbo.Products.ProductBrand, dbo.Products.ProductName
What this does is first get the products tbl, join that the orders_detail tbl, joins that the orders tbl which is finally joined to the calendar tbl.
What I'm finding is although it's working as intended, it's still not returning the product that haven't been bought..
I've narrowed this down to the following:
It I just to a Outer join on the products tbl to the order details tbl with no WHERE queries.. this returned what I want,, however as soon as I add the WHERE clause, it loses all the products and only shows the ones that have been purchased.
I would have thoughy my Outer join on the products tbl would get round this problem?