Sum the all the above rows of a field on another field in access query

I have an access table with field ID, Item NoofHour this in sequence I like the keep summing the NoofHours
so table Order
id  Item  Hours
1    abc    5
2    ccc    10
3    yyy    2
4   kka     3

I want to make query so result are
id  Item  Hours   Totalhr
1    abc    5             5                
2    ccc    10           15                
3    yyy    2             17
4   kka     3             20

So add the above hours. I will appreciate if somebody can tell me how I can get  sum  of row above.
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Paul NeralichBusiness OwnerCommented:

I think you are describing a "running total". Can you share the query that you have written so far?

- Paul N.
A running total is a trivial process in a report.  You just use the RunningSum() property to create the value.

However, it is much more of a problem in a query and it is also very inefficient and so may be extremely slow.  The most efficient method is to do a self- join and sum all the rows with a PK <= the current one.  This of course only works if you actually have a numeric uniqueID that is ascending.
Gustav BrockCIOCommented:
Here is how:

Select *, 
    (Select Sum(Hours) From [Orders] As T 
    Where T.Id <= [Orders].Id) As TotalHours
From [Order]

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SivasanAuthor Commented:
Hi Gustav Brock,
Thank you very much. This is what I was looking for worked
Thank you
Gustav BrockCIOCommented:
You are welcome!
Thanks for providing the fish Gus just in case the OP couldn't figure out my instructions.
Gustav BrockCIOCommented:
You are welcome!
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