sum() in group in sql reporting services

I create two group in a report, for example in group1(ID) 110116, the data
items are like the following:

110116 (group1)

      1               (1)

      1.5      (1.5)

      1.5            (1.2)

I need a sum 1 + 1.5 + 1.5 = 4 , but I always get 8 when I use sum(fields,
scope) in reporting services.

Is there any way to implement it ? Appreciate for any comments and

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SQL computes the sum on all the rows returned by your query :

Sum(Column2)   1+1+1.5+1.5+1.5+1.5=8

If you want 1+1.5+1.5, you need filter your tuples returned ... you can try to sum a formula like this (for Oracle):

Select Column1,sum(Decode(Column3,null,Column2,0))

Hi Lisa
I am not sure if got your question correctly.
Seems that u need to select one symbol (such as maximum) of each group
and calculate the sum.
if so this shall help u.

Select Sum(X) from
(Select Id, Max(Col1) X
from Table
Where Condition
Group by Id)

Good luck.

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lisayanAuthor Commented:
Hi guys,

I have resolved my problem. Although the method is not the same as yours, I still give points to you two.  My solution is:  

1. use select sum(column) as counter from ....    get counter number for each row.

2. use sum(fields!column_value/field!counter)    get all sum()

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