for xml path group by

select a.prodid,stuff((select '/'+pc.name from Product_ProductChannel ppc(nolock)
inner join ProductChannel pc(nolock) on ppc.productchannelid=pc.id where ppc.prodid=a.prodid for xml path('')),1,1,'')
from Product_ProductChannel a(nolock)
inner join ProductChannel b(nolock) on a.productchannelid=b.id
group by a.prodid