SCCM report list collections with no deployments

The following SQL query can be used to query the list of collections that doesn't have any deployments. you can review the number of collections with no deployments and you can further extend the query to exclude certain folders where you use these exception collections for troubleshooting or other purpose.

select Col.Name,
col.CollectionID,
case when col.CollectionType='2' then 'Device Based' 
when col.CollectionType='1' then 'Used Based' 
Else 'Others' end as 'Collection Type',
col.MemberCount,
coll.ObjectPath from dbo.v_Collection Col
inner join v_Collections coll on coll.SiteID=col.CollectionID
Where Col.CollectionID not in (select CollectionID from dbo.v_Advertisement)
order by Col.Name