identity(seed,numIncrement)
--創建測試表
CREATE TABLE t1(ID int IDENTITY,A int)
GO
--插入記錄
INSERT t1 VALUES(1)
GO
--1. 將IDENTITY(標識)列變爲普通列
ALTER TABLE t1 ADD ID_temp int
GO
UPDATE 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. 將普通列變爲標識列
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
GO
EXEC sp_rename N't1_temp',N't1'
INSERT t1 VALUES(109999)