将一个表中个某一列修改为自动增长的方法

/**************** 准备环境********************/

--判断是否存在test表
if object_id(Ntest,NU) is not null
drop table test

--创建test表
create table test
(
id int not null,
name varchar(20) not null
)

--插入临时数据
insert into test values (1,成龙)
insert into test values (3,章子怡)
insert into test values (4,刘若英)
insert into test values (8,王菲)

select * from test



/**************** 实现更改自动增长列********************/

begin transaction

create table test_tmp
(
id int not null identity(1,1),
name varchar(20) not null
)
go

set identity_insert test_tmp on
go

if exists(select * from test)
exec( insert into test_tmp(id, name ) select id, name from test with(holdlock tablockx))
go

set identity_insert test_tmp off
go

drop table test
go

exec sp_rename Ntest_tmp ,Ntest , OBJECT
go

commit

GO

/****************验证结果*****************/
insert into test values (张曼)
select * from test