表内有自增ID，用哪种语句可以将自增的ID一起删掉。意思就是，用delete删除ID为3的，新增会从4接着往下排。我想删除id为3的之后，新增的会从3往下排。用哪种语句？
------解决方案--------------------
自增ID直接删会导致跳号，重置ID可以用把数据插入一个表，然后truncate 源表，再插回去，或者
DBCC CHECKIDENT(表名,RESEED,0)
但是这两种都很麻烦，如果ID是否连续不是很重要的话，不要改动好一点
------解决方案--------------------
利用触发器实现标识列连续。(支持批量插入)
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[ttt]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[ttt]
GO
/****** Object: Table [dbo].[ttt] Script Date: 2008-12-15 17:11:26 ******/
CREATE TABLE [dbo].[ttt] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[name] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[time] [datetime] NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[ttt] ADD
CONSTRAINT [PK_ttt] PRIMARY KEY CLUSTERED
(
[id]
) ON [PRIMARY]
GO
insert into ttt(name,time) values('logan',getdate());
insert into ttt(name,time) values('peter',getdate());
insert into ttt(name,time) values('man',getdate());
insert into ttt(name,time) values('lida',getdate());
insert into ttt(name,time) values('fcuandy',getdate());
select * from ttt
/*
1 logan 2008-12-15 17:36:37.780
2 peter 2008-12-15 17:36:37.780
3 man 2008-12-15 17:36:37.780
4 lida 2008-12-15 17:36:37.780
5 fcuandy 2008-12-15 17:36:37.793
*/
GO
CREATE TRIGGER tr ON ttt
INSTEAD OF INSERT
AS
SET IDENTITY_INSERT ttt ON
DECLARE @n INT
SELECT @n=MAX(id) FROM ttt
;WITH fc AS
(
SELECT n=1
UNION ALL
SELECT nn=n+1 FROM fc WHERE n<@n
),fc1 AS
(
SELECT n FROM fc a
LEFT JOIN ttt b
ON a.n = b.id
WHERE b.id IS NULL
)
INSERT ttt(id,name,time) SELECT n,name,time
FROM
(SELECT ROW_NUMBER() OVER (ORDER BY GETDATE()) idx,n FROM fc1) a
INNER JOIN
(
SELECT idx=ROW_NUMBER() OVER (ORDER BY GETDATE()),name,time FROM inserted
) b
ON a.idx=b.idx
DECLARE @r INT
SELECT @r=@@ROWCOUNT
SET IDENTITY_INSERT ttt OFF
INSERT ttt(name,time) SELECT name,time FROM
(
SELECT idx=ROW_NUMBER() OVER (ORDER BY GETDATE()),name,time FROM inserted
) x
WHERE idx>@r
GO
DELETE FROM ttt WHERE name = 'peter' OR name='lida'
GO
INSERT ttt SELECT 'xxx',getdate()
INSERT ttt SELECT 'yyy',GETDATE()
GO
SELECT * FROM ttt
/*
1 logan 2008-12-15 17:37:20.967
2 xxx 2008-12-15 17:37:21.013
3 man 2008-12-15 17:37:20.967
4 yyy 2008-12-15 17:37:21.030
5 fcuandy 2008-12-15 17:37:20.967
*/
DELETE FROM ttt WHERE name ='xxx' OR name='yyy'
INSERT ttt SELECT 'roy_88',GETDATE() UNION ALL SELECT 'limpire',GETDATE() UNION ALL SELECT '熊',GETDATE()
SELECT * FROM ttt
/*
1 logan 2008-12-15 17:38:29.450
2 roy_88 2008-12-15 17:38:29.530
3 man 2008-12-15 17:38:29.467
4 limpire 2008-12-15 17:38:29.530