Can't select command field which type is memo

Question

I'm working on a crystal report and I want to insert a pie chart that shows percentages. I have a view that contains the field that I'm interested in : Descr(descrtiption) (NVARCHAR), I successfully added a command that gets the number of occurences of each Description. The problem is that when I try to add that field to the chart I can't see it,

here is the query that gets the values

here is the chart expert window I get

and as you can see the field is not checked in the field explorer

Answer 1

You will need to shorten the memo field to be able to use it in this manner. Try:

CAST(Desc AS NVARCHAR(2000))

Answer 2

Use Having clause instead of where condition in query.

Select count(*) as NBoccurrence,descr 
From tbl_nm
Group by descr 
Having your condition