@jacob

DBCC CHECKIDENT ('[TestTable]', RESEED,0)
DBCC CHECKIDENT ('[TestTable]', RESEED)

对我来说，我只需要先从表中清除所有条目，然后在删除后的触发点中添加上面的条目。现在每当我删除一个条目时，它就从那里被取出。

第一个:标识规范只是:“No”>>保存数据库执行项目

之后:身份规范只是:“是”>>保存数据库执行项目

您的数据库ID, PK从1 >>开始

对于一个完整的DELETE行和重置IDENTITY计数，我使用这个(SQL Server 2008 R2)

USE mydb

-- ##################################################################################################################
-- DANGEROUS!!!! USE WITH CARE
-- ##################################################################################################################

DECLARE
  db_cursor CURSOR FOR
    SELECT TABLE_NAME
      FROM INFORMATION_SCHEMA.TABLES
     WHERE TABLE_TYPE = 'BASE TABLE'
       AND TABLE_CATALOG = 'mydb'

DECLARE @tblname VARCHAR(50)
SET @tblname = ''

OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @tblname

WHILE @@FETCH_STATUS = 0
BEGIN
  IF CHARINDEX('mycommonwordforalltablesIwanttodothisto', @tblname) > 0
    BEGIN
      EXEC('DELETE FROM ' + @tblname)
      DBCC CHECKIDENT (@tblname, RESEED, 0)
    END

  FETCH NEXT FROM db_cursor INTO @tblname
END

CLOSE db_cursor
DEALLOCATE db_cursor
GO

这里的大多数回复似乎都假定表为空，Identity值需要重置。 然而，我如何阅读这个问题是@xorpower现在有一个记录1,2,3,5,6,7,12,13,14等的表…并需要一个方法将其返回到一个连续列表。(1、2、3、4、5、6、7、8、9等…)

但是由于我必须从表中删除一些记录， 恕我直言，这里有个神奇的词。

AFAIK在MSSQL中没有这样的东西;在最坏的情况下，您确实可以将现有的记录表转储到一个新表中，然后从那里开始。我的问题是:你为什么要这样做?IDENTITY列是最好的方法吗?

Anyway,the solutions provided here that do care about existing data are mostly about copying everything in a temp-table, TRUNCATEing the existing table; reseeding the table and then copying everything back again. I'm sure that works but if you have a lot of data then this is a pretty heavy operation. Personally I would rather go with creating an identical table, copying the data in that new table (maybe in batches?) and then finally SWITCHing the data to the original table and dropping the newly created table again. You're likely to need to do a CHECKIDENT after the SWITCH. This way you only need to move the data from one table to another once. To save space you could even DELETE the relevant records from the original table after a batch is copied.

PS:是的，我知道这是一个老问题，但考虑到它的高得分，它仍然出现在类似问题的顶部，因为没有人提到SWITCH，它似乎值得添加。

你可以CHECKIDENT重置种子

DBCC CHECKIDENT
 (
    table_name
        [ , { NORESEED | { RESEED [ , new_reseed_value ] } } ]
)
[ WITH NO_INFOMSGS ]

例子

 DBCC CHECKIDENT ('TAble', reseed,0)

-- 示例查询

您可以用以下代码插入基本数据

向表中插入数据后，先创建一个表

步骤到步骤i显示数据和删除数据显示细节理解代码

结果代码:创建带有rest种子Id的表 我用的是车管局系统。Identity_columns表具有标识

--Create Table 
DROP TABLE IF EXISTS  ExampleTable
create table ExampleTable (Id Bigint identity(1,1), Name nvarchar(10))

--Insert to ExampleTable and Delete and Show identity 
insert into ExampleTable (Name) 
select 'Test1' as NAme union all select 'Test2' as NAme

select * from ExampleTable

| Id       | Name |
| -------- | -----|
| 1        |Test1 |
| 2        |Test2 |

delete from ExampleTable

insert into ExampleTable (Name) select 'Test3' as NAme

select * from ExampleTable

| Id       | Name |
| -------- | -----|
| 3        |Test3 |

delete from ExampleTable

首次检查数据 如果表中没有数据使用种子表

如果表中有数据，使用最大id

之后用CHECKIDENT改变种子

--Find seedTable
declare @reseed int=0

if(not exists( select top 1 * from ExampleTable))
begin

    
     SELECT 
        @reseed=cast( seed_value as int)
    FROM sys.tables tables 
        JOIN sys.identity_columns identity_columns 
    ON tables.object_id=identity_columns.object_id
    where 
        tables.name='ExampleTable' 
    and OBJECT_SCHEMA_NAME(tables.object_id, db_id())='dbo'
 
      set @reseed=@reseed -1

 end
 else
 begin
   --if Table Has Data and use Max id For  seed
    set @reseed=(select top 1 id from ExampleTable order by id desc)

 end


  DBCC CHECKIDENT ('ExampleTable', reseed,@reseed)


insert into ExampleTable
(Name)
select 'Test4' as NAme


select * from ExampleTable


| Id       | Name |
| -------- | -----|
| 1        |Test4 |
 

GO

我使用下面的脚本来做到这一点。只有一种情况下，它会产生一个“错误”，即如果你已经删除了表中的所有行，而IDENT_CURRENT当前设置为1，即表中只有一行开始。

DECLARE @maxID int = (SELECT MAX(ID) FROM dbo.Tbl)
;

IF @maxID IS NULL
    IF (SELECT IDENT_CURRENT('dbo.Tbl')) > 1
        DBCC CHECKIDENT ('dbo.Tbl', RESEED, 0)
    ELSE
        DBCC CHECKIDENT ('dbo.Tbl', RESEED, 1)
    ;
ELSE
    DBCC CHECKIDENT ('dbo.Tbl', RESEED, @maxID)
;