Let’s say that you have a column named some_id in an outer-joined table that will return a value if a record exists and will return null if a record doesn’t exist…
- Add an image item to a table cell.
- Add two embedded images to the report; a check mark and a blank white square the same size. Let’s call the image files Check.png and Blank.png (or JPG, GIF, BMP, TIF, etc.)
- For the Value property of the image report item, use an expression like:
=IIF(IsNothing(Fields!some_id.Value), “Blank”, “Check”)
In the table or group footer, use a COUNT function with the same field: =COUNT(Fields!some_id.Value)
This will only count the existing values.