将GENERATED ALWAYS colum更改为GENERATED BY DEFAULT标识列 - Sql Server

Question

我需要将已配置为GENERATED ALWAYS的现有表列更改为GENERATED BY DEFAULT。

样本表结构

CREATE TABLE [dbo].[Contact](
    [ContactID] [uniqueidentifier] NOT NULL,
    [ContactNumber] [nvarchar](50) NOT NULL,
    [SequenceID] [int] IDENTITY(1,1) NOT NULL,
    [SysStartTime] [datetime2](0) GENERATED ALWAYS AS ROW START NOT NULL,
    [SysEndTime] [datetime2](0) GENERATED ALWAYS AS ROW END NOT NULL,
 CONSTRAINT [PK_Contact] PRIMARY KEY NONCLUSTERED 
(
    [ContactID] ASC
)WITH (PAD_INDEX = OFF, 
       STATISTICS_NORECOMPUTE = OFF, 
       IGNORE_DUP_KEY = OFF, 
       ALLOW_ROW_LOCKS = ON, 
       ALLOW_PAGE_LOCKS = ON) 
   ON [PRIMARY],
PERIOD FOR SYSTEM_TIME ([SysStartTime], [SysEndTime])
) ON [PRIMARY]
WITH
(
    SYSTEM_VERSIONING = ON (HISTORY_TABLE = [dbo].[ContactHistory],
                            DATA_CONSISTENCY_CHECK = ON )
)

这是我现在已经拥有的表我需要更改列 来自[SysStartTime]

的GENERATED BY DEFAULT到GENERATED ALWAYS

我尝试了以下代码

ALTER TABLE dbo.Contact ALTER column SysStartTime SET GENERATED BY DEFAULT

但它会抛出错误

  

消息156，级别15，状态1，行19关键字附近的语法不正确   'SET'。

请帮助我。