这发生在我身上，因为我做了一个合并，它更新了我正在进行合并的ID。

失败的例子(注意ClownID):

    MERGE ArchitectMain.dbo.BackendClowns AS TGT 
   USING (
    SELECT ClownID
        ,ClownName
        ,Description
        ,Active
        ,EmailSubject
        ,AddedBy
        ,Added
    FROM #temptable1
    ) AS SRC(ClownID, ClownName, Description, Active, EmailSubject, AddedBy, Added)
    ON (TGT.ClownID = SRC.ClownID)
WHEN MATCHED
    THEN
        UPDATE
        SET ClownID = SRC.ClownID
            ,ClownName = SRC.ClownName
            ,Description = SRC.Description
            ,Active = SRC.Active
            ,EmailSubject = SRC.EmailSubject
            ,AddedBy = SRC.AddedBy
            ,Added = SRC.Added;

示例(注意ClownID):

MERGE ArchitectMain.dbo.BackendClowns AS TGT
USING (
    SELECT ClownID
        ,ClownName
        ,Description
        ,Active
        ,EmailSubject
        ,AddedBy
        ,Added
    FROM #temptable1
    ) AS SRC(ClownID, ClownName, Description, Active, EmailSubject, AddedBy, Added)
    ON (TGT.ClownID = SRC.ClownID)
WHEN MATCHED
    THEN
        UPDATE
        SET ClownName = SRC.ClownName
            ,Description = SRC.Description
            ,Active = SRC.Active
            ,EmailSubject = SRC.EmailSubject
            ,AddedBy = SRC.AddedBy
            ,Added = SRC.Added;
            

您还可以使用SET IDENTITY INSERT来允许您将值插入到标识列中。

例子:

SET IDENTITY_INSERT dbo.Tool ON
GO

然后你可以在单位列中插入你需要的值。

我已经解决了这个问题，首先使用DBCC，然后使用插入。例如，如果你的桌子是

首先在表中设置新的当前ID Value为NEW_RESEED_VALUE

MyTable { IDCol, 可乐, colB ｝

    DBCC CHECKIDENT('MyTable', RESEED, NEW_RESEED_VALUE)

然后你可以使用

    insert into MyTable (colA, ColB) select colA, colB from MyTable

这将复制所有记录，但使用新的IDCol值作为NEW_RESEED_VALUE开始。然后，在删除/移动外键引用(如果有)后，可以删除ID值较高的重复行。

您不能更新标识列。 SQL Server不允许更新标识列，这与使用更新语句更新其他列不同。

尽管有一些替代方案可以实现类似的需求。

当需要为新记录更新标识列值时

使用DBCC CHECKIDENT检查表的当前标识值，如果需要，则更改标识值。

DBCC CHECKIDENT('tableName', RESEED, NEW_RESEED_VALUE)

当需要更新现有记录的标识列值时

使用IDENTITY_INSERT，它允许显式的值插入到表的标识列中。

SET IDENTITY_INSERT YourTable {ON|OFF}

例子:

-- Set Identity insert on so that value can be inserted into this column
SET IDENTITY_INSERT YourTable ON
GO
-- Insert the record which you want to update with new value in the identity column
INSERT INTO YourTable(IdentityCol, otherCol) VALUES(13,'myValue')
GO
-- Delete the old row of which you have inserted a copy (above) (make sure about FK's)
DELETE FROM YourTable WHERE ID=3
GO
--Now set the idenetity_insert OFF to back to the previous track
SET IDENTITY_INSERT YourTable OFF

DBCC CHECKIDENT(table_name, RESEED, value)

Table_name =给出要重置的表的值

Value =初始值为0，以1开始单位列

你需要

set identity_insert YourTable ON

然后删除行并重新插入不同的标识。

插入完成后，不要忘记关闭identity_insert

set identity_insert YourTable OFF