引用邹建的:
--创建测试表
CREATE TABLE t1(ID int IDENTITY,A int)
GO
--插入记录
INSERT t1 VALUES(1)
GO--1. 将IDENTITY(标识)列变为普通列
ALTER TABLE t1 ADD ID_temp int
GOUPDATE t1 SET ID_temp=ID
ALTER TABLE t1 DROP COLUMN ID
EXEC sp_rename N't1.ID_temp',N'ID',N'COLUMN'
INSERT t1 VALUES(100,9)
GO--2. 将普通列变为标识列
CREATE TABLE t1_temp(ID int,A int IDENTITY)
SET IDENTITY_INSERT t1_temp ON
INSERT t1_temp(ID,A) SELECT * FROM t1
SET IDENTITY_INSERT t1_temp OFF
DROP TABLE T1
GOEXEC sp_rename N't1_temp',N't1'
INSERT t1 VALUES(109999)
GO--显示处理结果
SELECT * FROM t1
/*--结果:
ID A
----------------- -----------
1 1
100 9
109999 10
--*/
--创建测试表
CREATE TABLE t1(ID int IDENTITY,A int)
GO
--插入记录
INSERT t1 VALUES(1)
GO--1. 将IDENTITY(标识)列变为普通列
ALTER TABLE t1 ADD ID_temp int
GOUPDATE t1 SET ID_temp=ID
ALTER TABLE t1 DROP COLUMN ID
EXEC sp_rename N't1.ID_temp',N'ID',N'COLUMN'
INSERT t1 VALUES(100,9)
GO--2. 将普通列变为标识列
CREATE TABLE t1_temp(ID int,A int IDENTITY)
SET IDENTITY_INSERT t1_temp ON
INSERT t1_temp(ID,A) SELECT * FROM t1
SET IDENTITY_INSERT t1_temp OFF
DROP TABLE T1
GOEXEC sp_rename N't1_temp',N't1'
INSERT t1 VALUES(109999)
GO--显示处理结果
SELECT * FROM t1
/*--结果:
ID A
----------------- -----------
1 1
100 9
109999 10
--*/
alter table tb alter column id int identity(1,1)
但自增量不能用上述方法改为自增量,楼主只有到企业管理器里手工改了.
GO
RECONFIGURE WITH OVERRIDE
GO
UPDATE syscolumns
SET typestat = 1, colstat = 1
WHERE name = 'i' and id = OBJECT_ID('b')
GO
sp_configure 'allow updates', 0
GO
RECONFIGURE WITH OVERRIDE
GO
b=tablename
SET IDENTITY_INSERT 表名 ON --关闭自动增长标识SET IDENTITY_INSERT 表名 Off --打开自动增长标识