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

在可能的情况下使用TRUNCATE总是比删除所有记录更好，因为它也不使用日志空间。

如果我们需要删除和重置种子，请记住，如果表从未被填充，并且您使用DBCC CHECKIDENT('tablenem'，RESEED,0) 那么第一条记录将得到identity = 0 如MSDN文档所述

在您的情况下，只重建索引，而不用担心丢失 级数恒等式这样的情况很常见。

需要注意的是，如果所有的数据都是通过DELETE从表中删除的(即没有WHERE子句)，那么只要a)权限允许，b)没有fk引用表(这里似乎就是这种情况)，使用TRUNCATE table将是首选，因为它可以更有效地DELETE并同时重置IDENTITY种子。以下细节取自TRUNCATE TABLE的MSDN页面:

Compared to the DELETE statement, TRUNCATE TABLE has the following advantages: Less transaction log space is used. The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table data and records only the page deallocations in the transaction log. Fewer locks are typically used. When the DELETE statement is executed using a row lock, each row in the table is locked for deletion. TRUNCATE TABLE always locks the table (including a schema (SCH-M) lock) and page but not each row. Without exception, zero pages are left in the table. After a DELETE statement is executed, the table can still contain empty pages. For example, empty pages in a heap cannot be deallocated without at least an exclusive (LCK_M_X) table lock. If the delete operation does not use a table lock, the table (heap) will contain many empty pages. For indexes, the delete operation can leave empty pages behind, although these pages will be deallocated quickly by a background cleanup process. If the table contains an identity column, the counter for that column is reset to the seed value defined for the column. If no seed was defined, the default value 1 is used. To retain the identity counter, use DELETE instead.

下面是:

DELETE FROM [MyTable];
DBCC CHECKIDENT ('[MyTable]', RESEED, 0);

变成:

TRUNCATE TABLE [MyTable];

请参阅TRUNCATE TABLE文档(上面有链接)以获得有关限制等的其他信息。

我尝试了@anil shahs的答案，它重置了身份。但是当插入新的行时，它得到了恒等式= 2。所以我把语法改为:

DELETE FROM [TestTable]

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

那么第一行将得到恒等式= 1。

运行此脚本重置标识列。您需要做两个更改。用需要更新的表替换tableXYZ。此外，标识列的名称需要从临时表中删除。这在一个有35000行和3列的表上是瞬时的。显然，备份表并首先在测试环境中尝试这一点。

select * 
into #temp
From tableXYZ

set identity_insert tableXYZ ON

truncate table tableXYZ

alter table #temp drop column (nameOfIdentityColumn)

set identity_insert tableXYZ OFF

insert into tableXYZ
select * from #temp

使用这个存储过程:

IF (object_id('[dbo].[pResetIdentityField]') IS NULL)
  BEGIN
    EXEC('CREATE PROCEDURE [dbo].[pResetIdentityField] AS SELECT 1 FROM DUMMY');
  END
GO

SET  ANSI_NULLS ON
GO
SET  QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[pResetIdentityField]
  @pSchemaName NVARCHAR(1000)
, @pTableName NVARCHAR(1000) AS
DECLARE @max   INT;
DECLARE @fullTableName   NVARCHAR(2000) = @pSchemaName + '.' + @pTableName;

DECLARE @identityColumn   NVARCHAR(1000);

SELECT @identityColumn = c.[name]
FROM sys.tables t
     INNER JOIN sys.schemas s ON t.[schema_id] = s.[schema_id]
     INNER JOIN sys.columns c ON c.[object_id] = t.[object_id]
WHERE     c.is_identity = 1
      AND t.name = @pTableName
      AND s.[name] = @pSchemaName

IF @identityColumn IS NULL
  BEGIN
    RAISERROR(
      'One of the following is true: 1. the table you specified doesn''t have an identity field, 2. you specified an invalid schema, 3. you specified an invalid table'
    , 16
    , 1);
    RETURN;
  END;

DECLARE @sqlString   NVARCHAR(MAX) = N'SELECT @maxOut = max(' + @identityColumn + ') FROM ' + @fullTableName;

EXECUTE sp_executesql @stmt = @sqlString, @params = N'@maxOut int OUTPUT', @maxOut = @max OUTPUT

IF @max IS NULL
  SET @max = 0

print(@max)

DBCC CHECKIDENT (@fullTableName, RESEED, @max)
go

--exec pResetIdentityField 'dbo', 'Table'

回顾一下我的答案。我在sql server 2008 r2中遇到了一个奇怪的行为，你应该知道。

drop table test01

create table test01 (Id int identity(1,1), descr nvarchar(10))

execute pResetIdentityField 'dbo', 'test01'

insert into test01 (descr) values('Item 1')

select * from test01

delete from test01

execute pResetIdentityField 'dbo', 'test01'

insert into test01 (descr) values('Item 1')

select * from test01

第一个选择生成0,Item 1。

第二个生成1，项目1。如果在表创建后立即执行重置，则下一个值为0。老实说，我并不惊讶微软不能把这些东西做好。我发现它是因为我有一个填充引用表的脚本文件，有时在重新创建表后运行，有时在已经创建表时运行。