Report Usage (show those that are not used)

Question

How do I identify which reports haven't been accessed in the last 12 months?
Below is the script to show the current report usage... but i need to know which ones haven't been accessed
select c.name,
e.userName,
e.format,
e.parameters,
e.timeStart,
e.status
from REPORTSERVER.DBO.EXECUTIONLOG e
left outer join charon.reportserver.dbo.catalog c on e.reportID = c.itemID
where
e.timeStart >= dateAdd(mm,-6,getDate())
order by timestart desc

Answer 1

select *from charon.reportserver.dbo.catalog cwhere c.itemid not in (select c.itemid
from REPORTSERVER.DBO.EXECUTIONLOG e
left outer join charon.reportserver.dbo.catalog c on e.reportID = c.itemID
where
e.timeStart >= dateAdd(mm,-6,getDate())
Andrew Sears, T4G Limited, http://www.performancepointing.com