Crystal Report to report Monthly Open Incidents

Question

We currently have an Incident Management System to log our Support issues. Incidents have a Created and Closed Date.
I have been asked to write a report that returns all Opened calls grouped by Month for the last 12 months. What I'm having difficult in is working out how to determine whether an Incident was open in one of those months.
Anyone have any ideas?
I'm trying to set this up as a Cross-Tab report with Months listed across the top and totals on 2nd row
Any help would be greatfully received

Answer 1

Thank you, I've changed the code to what I think reflects my Incident table however I get the error below:
Msg 207, Level 16, State 1, Line 22
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 23
Invalid column name 'daccepted'.
Msg 209, Level 16, State 1, Line 24
Ambiguous column name 'StartDate'.
Msg 207, Level 16, State 1, Line 2
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 2
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 2
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 3
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 3
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 3
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 3
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 4
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 4
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 4
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 5
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 5
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 5
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 5
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 6
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 6
Invalid column name 'daccepted'.
Msg 207, Level 16, State 1, Line 6
Invalid column name 'dcleared'.
Msg 207, Level 16, State 1, Line 6
Invalid column name 'dcleared'.
Msg 209, Level 16, State 1, Line 25
Ambiguous column name 'StartDate'.
My code looks like this:
select ReportedDate, CompletionDate, mm,
sum ( case when daccepted < ReportedDate and ( dcleared >= ReportedDate or dcleared = '1900-01-01') then 1 else 0 end ) as Brought_forward,
sum ( case when daccepted between ReportedDate and CompletionDate then 1 else 0 end ) as Opened, sum ( case when dcleared between  ReportedDate and CompletionDate then 1 else 0 end ) as Closed,
sum ( case when daccepted <= CompletionDate and ( dcleared > CompletionDate or dcleared = '1900-01-01') then 1 else 0 end ) as Carried_forward,
sum ( case when daccepted between ReportedDate and CompletionDate and ( dcleared > CompletionDate or dcleared = '1900-01-01') then 1 else 0 end ) as ThisMonths_Carried_forward,
sum ( case when daccepted between ReportedDate and CompletionDate and dcleared between  ReportedDate and CompletionDate  then 1 else 0 end ) as OpenResolvedThisMonth
from Incidents
cross join (     Select     dateadd( mm, mm * -1 , today - day(today ) ) + 1 as StartDate    , dateadd( mm, ( mm - 1) * -1 , today - day( today )  ) as EndDate    , mm    from        
( select 1 as mm
union all select 2
union all select 3      
union all select 4
union all select 5
union all select 6       
union all select 7
union all select 8
union all select 9      
union all select 10
union all select 11
union all select 12        ) cal
cross join (select convert(datetime,convert(char(10),getdate(),121)) as today) tt) DateRange
where ( dcleared = {ts '1900-01-01 00:00:00'} /* open calls, regardless of when started */
or daccepted >=  dateadd ( yy, -1, getdate() - day(getdate() ) ) /* all calls at least one year */)
group by StartDate, EndDate, mm
order by StartDate Desc
Thank you
Nathan