将您的表复制到没有标识列的新表。

    select columns into newtable from yourtable

用new seed添加一个标识列到newtable，并将其作为主键

    ALTER TABLE tableName ADD id MEDIUMINT NOT NULL AUTO_INCREMENT KEY

就我所见，有几种方法可以做到这一点。，但在我看来最好和最快的方法是以下一种:

标识列有一个计数器，它不一定与已注册的列相同，您可以使用以下SQL命令查看该计数器的值:

DBCC CHECKIDENT('tableName', NORESEED);

然后，如果你想编辑标识列，你将不能，但我建议在重新播种计数器到你需要的数字后，做一个新的寄存器。要重新播种计数器，使用以下命令:

DBCC CHECKIDENT('tableName', RESEED, desiredNumber);

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

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

尝试使用DBCC CHECKIDENT:

DBCC CHECKIDENT ('YourTable', RESEED, 1);

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;