Question

我是新的SQL世界我既不想重建整个表，也不想添加新列。

Answer 1

如果要更改现有的表列，可以尝试：用tmp_yourtablename替换Tmp_example1 用yourtablename替换example1 用你的列名替换eid

BEGIN TRANSACTION
SET QUOTED_IDENTIFIER ON
SET ARITHABORT ON
SET NUMERIC_ROUNDABORT OFF
SET CONCAT_NULL_YIELDS_NULL ON
SET ANSI_NULLS ON
SET ANSI_PADDING ON
SET ANSI_WARNINGS ON
COMMIT
BEGIN TRANSACTION
GO
CREATE TABLE dbo.Tmp_example1
(
eid INT NOT NULL IDENTITY (1, 1)
) ON [PRIMARY] GO
SET IDENTITY_INSERT dbo.Tmp_example1 ON
GO
IF EXISTS(SELECT * FROM dbo.example1)
EXEC('INSERT INTO dbo.Tmp_example1 (eid)
SELECT eid FROM dbo.example1 WITH (HOLDLOCK TABLOCKX)')
GO
SET IDENTITY_INSERT dbo.Tmp_example1 OFF
GO
DROP TABLE dbo.example1
GO
EXECUTE sp_rename N'dbo.Tmp_example1', N'example1', 'OBJECT'
GO
COMMIT

Answer 2

//删除列

Alter TABLE [dbo].[t_name]
    drop column [columnname]

//使用标识和以前的列名创建一个新列

Alter TABLE [dbo].[t_name]

add  [columnname] [int] IDENTITY(1,1) NOT NULL

如何在创建的表上设置Identity（1,1）

2 个答案: