如何总结 rdlc 报告中每组中列的最后一行值？

Question

I want to add only the last row value of any column of each group in a rdlc report, so, iam having an rdlc group report, which has a balance column, so what i want is to add the last balance value of each group in the report,here is how my table looks like '

Customer   Balance
  Mark       1500
  Mark       2500
-----------------------
  Steve     4500
  Steve     5600
-----------------------
 Alex      10000
 Alex      24000

'.and i want to add the last balance value of each Customer, which is 2500+5600+24000, here is the rdlc expression i have tried before and which did not work:

'=SUM(LAST(fields!balance.value),"mygroup")'

I would be glad if someone provides me the solution of fixing this problem.

Answer 1

As you may have realised, you can't use FIRST, LAST etc in an outer aggregate but there is away to get around it.

First I replicated your data, but I also added a sort column. I assume you will have a column to sort on already (an invoice number of date etc).

The trick is to sum only if the sort value is the same as the maximum sort value for the group, it will be clearer with an example.

Here's the sample data I produced.

DECLARE @t TABLE (Customer varchar(50), sort int, Amount int)
  INSERT INTO @t VALUES
    ('Mark', 1, 1500),
    ('Mark', 2, 2500),
    ('Steve', 1, 4500),
    ('Steve', 2, 5600),
    ('Alex', 1, 10000),
    ('Alex', 2, 24000)

  SELECT * FROM @t 

Next I created a new report, added the above query as a dataset query and added simple table to the report.

I added a Row Group to group by Customer and sorted that group by sort .

I then added a final row outside the groups and set the expression to give the results you require.

Here's the simple report layout.

Here's the expression I used.

=Sum(
    IIF(
        Fields!sort.Value = MAX(Fields!sort.Value, "Customer"),
        Fields!Amount.Value,
        0
        )
    )

Note: The "Customer" string refers to the Row Group name (highlighted in the image), not the dataset column.

Here is the final output