合并相同id的字符串.sql

SQL语言常用的一些命令各代码

ID    COTENT
--------------------
1  , "aaa"
1  , "bbb"
1  , "ccc"
2  , "aa "
2  , "bb"  
如何写sql语句让相同的id的content合并 

就是结果变成
ID  Cotent
-------------------------
1 ,"aaabbbccc"
2 ,"aabb" 


declare @a table(id int ,cotent varchar(10))
insert into @a select 1,'"aaa"'
union all     select 1,'"bbb"'
union all     select 1,'"ccc"'
union all     select 2,'"aa"'
union all     select 2,'"bb"'
declare @b table (autoid int identity(1,1),id int,cotent varchar(10))
insert into @b select * from @a
declare @aa int,@bb int,@cc  varchar(20)
select @aa=(select min(id) from @b)
select @bb=1
while @aa<=(select max(id) from @b)
 begin
    select @cc=(select replace(cotent,'"','') from @b where id=@aa and autoid=@bb)
    declare @c table(autoid int identity(1,1),id int,cotent varchar(20))
    while @bb<=(select max(autoid) from @b where id=@aa)
      begin
      insert into @c select @aa,@cc
      select @bb=@bb+1
      select @cc=@cc+(select replace(cotent,'"','') from @b where id=@aa and autoid=@bb)
      end
 select @aa=(select min(id) from @b where id>@aa)
 end
select id,'"'+cotent+'"'as Cotent from @c where autoid in (select autoid from (select id,max(autoid)as autoid from @c  group by id)a)