|Re: HowTo sum (accumulate) aggregate values in chart BIRT Eclipse [message #1009494 is a reply to message #1009297]
||Fri, 15 February 2013 08:28
| Alberto Morando
Registered: February 2013
Thank you for the info.
I will try to explain step by step what I did and attach the chart I have got.
I have a table with Date, ID (2 columns). I use it in the chart (i.e. Select Data field is "USe Report Item" and I choose the table with the 2 columns).
I create the chart and:
1) In the 'Select Data' screen of your chart, for Category (X) Series select the DATE field
2) right of 'fx' you can select the X axis grouping : at this step I have choosen:
- Data Sorting: Ascending
- Grouping: Enabled
- Type: DateTime
- Unit: Month
- Interval: 1
- Aggregation Expression: Count
3) In the Value (Y) Series field, put ID: In this case I have put row._rownum (number of items in a month)
4) To the left of the Value (Y) Series field, in the dropdowm menu I choose "Count" as you suggested.
The result is attached picture.
AS you can see we have the number of items for each month. (e.g. 04/2011, 1; 06/2011, 2; 07/2011, 3; and so on).
BUT what I would like to achieve is to have a sum of them (accumulated per month) (e.g. for the example above I would like to have a chart showing : 04/2011, 1; 06/2011, 3; 07/2011, 6; and so on).
Could you please help me on achieving this? I think I miss the little final step to get it.
I really appreciate your help.
|Re: HowTo sum (accumulate) aggregate values in chart BIRT Eclipse [message #1010941 is a reply to message #1010779]
||Mon, 18 February 2013 14:16
Registered: February 2013
Okay, I wasn't aware of that the running count is not available in earlier BIRT versions.|
I created a scripted version of the running count by adding a computed column to the dataset. Of course this adds some redundant data to the processing, but that's what comes to my mind and which works... I will attach the report but in case you are not able to view it, here are the steps:
- make sure your data is retrieved ordered by date (add "ORDER BY DATE" to your sql query)
- add a computed column to your dataset, name it "running_count", set type to integer, and expression to 0. click ok to save
- while the dataset is selected, click the script button to open scripting for that dataset
- in "before open", type:
- in "onFetch", type:
row["running_count"] = i;
- in your chart, for Value (Y) Series, select the row["running_count"]
(it will not appear in the data selection, so you have to edit your data bindings or re-select the datasource or recreate the chart with the updated dataset)
- as aggregate function for Value (Y) Series, select MAXIMUM or LAST
Finally I hope that BIRT 2.2.1 supports the aggregate function MAXIMUM or LAST... if not then I don't know anymore :S
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