Make comma separates list from database table

select distinct se.guid, spt.respid
into #tempSUBLOS
from dbo.Static_Pivot_Table spt inner join dbo.tblSaratogaExtract se on spt.respid=se.respid
where spt.sublos is null


DECLARE @listStr VARCHAR(MAX)
SELECT @listStr = COALESCE(@listStr+',' ,'') + se.[GUID]
from #tempSUBLOS se
SELECT @listStr

drop table #tempSUBLOS
GO