SQL 合并多条记录成一条记录

update QGJVector..ProjectVector 
set Tag=c.subennmcd 
from QGJVector ..ProjectVector
Left join 
(select distinct pennmcd ,
STUFF ( 
      (select replace('$'+branchennmcd,' ','') from gq_ok ..[0510_swinfo] where pennmcd =a.pennmcd for XML path('') 
      )
          ,1,1,'') as subennmcd
from gq_ok ..[0510_swinfo] a )c
on c.pennmcd=QGJVector ..ProjectVector.Code