SQLServer存储过程中的输出参数的使用

if (exists(select * from  sys.objects where name='GetUser'))
      drop proc GetUser
  go 
  create proc GetUser
      @id int output,
      @name varchar(20) out
  as 
  begin 
      select @id=Id,@name=Name from UserInfo where Id=@id
 end
 go 
 declare 
 @name varchar(20),
 @id int;
 set @id=3;
 exec dbo.GetUser @id,@name out;
 select @id,@name;
 print Cast(@id as varchar(10))+'-'+@name;