SQL Server克隆树表

如何解决SQL Server克隆树表

我有一个表Orgs（Id标识，Name，parent_id和country_id） 我需要在sql Server中使用CTE将树从country_id复制到另一个Country_id。 我写了这个SP。 有谁有更好的解决方案？

Create procedure sp_clone_sub_orgs(@from_country_id as int,@to_country_id as int )
as 
declare @to_name as varchar(200) ;
declare @max as int ;
select @to_name = name from Countries where id = @to_country_id;
select @max =   MAX(ID) FROM orgs;
delete orgs where country_id= @to_country_id;
set identity_insert orgs on ;
SELECT
        row_number() over(order by id asc) as rn,ID,parent_id,name
INTO @Q
FROM orgs where country_id =@from_country_id

Insert into orgs (id,name,country_id)
Select 
        rn + @max as id,Isnull((select @max + rn from #Q q_temp where q_temp.id =q.parent_id),0),Case When parent_id = 0 then @to_name else name end,@to_country_id as country_id
From #Q q;
set identity_insert orgs off ;
Drop Table @Q;
GO

谢谢。