Add column data from one row to another

I have a two tables Products and BusinessDates

Products
ProductCode
BusDate datetime
ID int
ItemsSold int

BusinessDates
BusDate datetime

I would like to add the ItemsSold for all the Products whose date is not in BusinessDates
to the next business date for a given Product and ID
Example

BusinessDates
06/14/2013
06/17/2013
06/18/2013


Products
XYZ
06/14/2013
123
3

XYZ
06/15/2013
123
10

XYZ
06/16/2013
123
5

XYZ
06/17/2013
123
12

Final result set
XYZ
06/14/2013
123
3

XYZ
06/17/2013
123
27
LVL 1
countrymeisterAsked:
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DOSLoverConnect With a Mentor Commented:
countrymeister,
Here is a Select query - I have added a column that shows what will be NewTotalOfItemsSoldForTheDay. If this looks fine, this can easily be changed to an update query.
 
SELECT a.Product, a.ProductId, a.BusDate, a.ItemsSold
          ,a.ItemsSold + (select sum(ItemsSold) 
              from Products b 
            where b.Product = a.Product 
                and b.ProductId=a.ProductId 
                and b.Busdate < a.BusDate
                and b.Busdate > (Select Max(BusDate) from BusDates c where c.BusDate < a.BusDate)
             ) AS NewTotalOfItemsSoldForTheDay
FROM Products a
 where exists (Select BusDate from BusDates d where d.BusDate = a.BusDate)
Order by 1,2,3

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0
 
alpmoonConnect With a Mentor Commented:
I haven't tested, but I think you need something like below

update Products
  from Products P1
   set ItemsSold + (select sum(P2.ItemSold) from Products P2
                     where P2.BusDate is not in (select BusDate from BusinessDates)
                       and P2.Busdate > (select max(B.BusDate) from BusinessDates B
                                          where B.BusDate < P1.BusDate)
                       and P2.Busdate < P1.Busdate)
                            )
0
 
countrymeisterAuthor Commented:
My question was incorrect. Going to post again
0
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