三种方法：增加一个自动增长的列

--eg1:表里增加字段
CREATE TABLE t7(id int IDENTITY(100,1));

--eg2:
--自动增长的函数
 create   function   iden()   
  returns   int   
  as   
  begin   
      declare   @a1   int   
      set   @a1   =   1   
      while   exists(select   *   from   table_name   where   id=@a1)   
          set   @a1   =   @a1   +   1   
      return   @a1   
  end 

--eg3: 虚拟表
select   identity(int,1,1)   kk,*   into   #t   from   T 
select   #t

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