SQL 2005 UPDATE 问题

[yihuaheren010]

有表table，结构如下：
AUTOID AA BB
1 1 aa
2 1 bb
3 1 cc
4 1 dd
5 1 ee
6 1 ff
7 1 gg
8 1 hh
9 2 ii
10 2 jj
11 2 kk
12 2 ll
13 2 mm
14 3 nn
15 3 oo
现在需要把表中AA字段相等的值的行BB值更新为AUTOID最小的BB字段的值，且连续的行不超过3的倍数，超过的更新为第3*N+1的BB字段的值行，更新后，表table的值如下：
AUTOID AA BB
1 1 aa
2 1 aa
3 1 aa
4 1 dd
5 1 dd
6 1 dd
7 1 gg
8 1 gg
9 2 ii
10 2 ii
11 2 ii
12 2 ll
13 2 ll
14 3 nn
15 3 nn
请问SQL语句怎么写呢？

[中国风]

use Tempdb
go
--> --> 
 
if not object_id(N'Tempdb..#T') is null
	drop table #T
Go
Create table #T([AUTOID] int,[AA] int,[BB] nvarchar(2))
Insert #T
select 1,1,N'aa' union all
select 2,1,N'bb' union all
select 3,1,N'cc' union all
select 4,1,N'dd' union all
select 5,1,N'ee' union all
select 6,1,N'ff' union all
select 7,1,N'gg' union all
select 8,1,N'hh' union all
select 9,2,N'ii' union all
select 10,2,N'jj' union all
select 11,2,N'kk' union all
select 12,2,N'll' union all
select 13,2,N'mm' union all
select 14,3,N'nn' union all
select 15,3,N'oo'
Go
;WITH a
as
(
Select 
	*,ROW_NUMBER()OVER(PARTITION BY AA,([AUTOID]-1)%3+1 ORDER BY [AUTOID]) AS row
from #T
)
UPDATE b
SET bb=c.bb
FROM a AS b  
CROSS APPLY
(SELECT TOP 1  [BB] FROM a  WHERE row=b.row AND AA=b.AA ORDER BY [AUTOID]) AS c

GO
SELECT * FROM #T
/*
AUTOID	AA	BB
1	1	aa
2	1	aa
3	1	aa
4	1	dd
5	1	dd
6	1	dd
7	1	gg
8	1	gg
9	2	ii
10	2	ii
11	2	ii
12	2	ll
13	2	ll
14	3	nn
15	3	nn
*/

[-晴天]

create table tb(AUTOID int,AA int,BB varchar(10))
insert into tb select 1,1,'aa'
insert into tb select 2,1,'bb'
insert into tb select 3,1,'cc'
insert into tb select 4,1,'dd'
insert into tb select 5,1,'ee'
insert into tb select 6,1,'ff'
insert into tb select 7,1,'gg'
insert into tb select 8,1,'hh'
insert into tb select 9,2,'ii'
insert into tb select 10,2,'jj'
insert into tb select 11,2,'kk'
insert into tb select 12,2,'ll'
insert into tb select 13,2,'mm'
insert into tb select 14,3,'nn'
insert into tb select 15,3,'oo'
go
update b set BB=a.bb 
from tb a inner join tb b on a.AA=b.AA and a.AUTOID<b.AUTOID and a.AUTOID/3=(b.AUTOID-1)/3 
select * from tb
/*
AUTOID      AA          BB
----------- ----------- ----------
1           1           aa
2           1           aa
3           1           aa
4           1           cc
5           1           cc
6           1           cc
7           1           ff
8           1           ff
9           2           ii
10          2           ii
11          2           ii
12          2           ii
13          2           ll
14          3           nn
15          3           nn

(15 行受影响)

*/
go
drop table tb

[快溜]

update a set BB=(select top 1 BB from tb where AA=a.AA 
                              and (AUTOID-1)%3=(a.AUTOID-1)%3 order by AUTOID)
 from tb a

[中国风]

use Tempdb
go
--> --> 
 
if not object_id(N'Tempdb..#T') is null
	drop table #T
Go
Create table #T([AUTOID] int,[AA] int,[BB] nvarchar(2))
Insert #T
select 1,1,N'aa' union all
select 2,1,N'bb' union all
select 3,1,N'cc' union all
select 4,1,N'dd' union all
select 5,1,N'ee' union all
select 6,1,N'ff' union all
select 7,1,N'gg' union all
select 8,1,N'hh' union all
select 9,2,N'ii' union all
select 10,2,N'jj' union all
select 11,2,N'kk' union all
select 12,2,N'll' union all
select 13,2,N'mm' union all
select 14,3,N'nn' union all
select 15,3,N'oo'
Go
;WITH a
as
(
Select 
	*,
	(ROW_NUMBER()OVER(PARTITION BY [AA] ORDER BY [AUTOID])-1)%3+1 AS row
from #T
)
UPDATE b
SET bb=c.BB
FROM a AS b
INNER JOIN a AS c ON (c.[AUTOID]-c.row)=(b.AUTOID-b.row) AND b.AA=c.AA AND c.row=1

go

SELECT * FROM #T
/*
AUTOID	AA	BB
1	1	aa
2	1	aa
3	1	aa
4	1	dd
5	1	dd
6	1	dd
7	1	gg
8	1	gg
9	2	ii
10	2	ii
11	2	ii
12	2	ll
13	2	ll
14	3	nn
15	3	nn
*/

[-晴天]

呵呵...不行,改一下.

create table tb(AUTOID int,AA int,BB varchar(10))
insert into tb select 1,1,'aa'
insert into tb select 2,1,'bb'
insert into tb select 3,1,'cc'
insert into tb select 4,1,'dd'
insert into tb select 5,1,'ee'
insert into tb select 6,1,'ff'
insert into tb select 7,1,'gg'
insert into tb select 8,1,'hh'
insert into tb select 9,2,'ii'
insert into tb select 10,2,'jj'
insert into tb select 11,2,'kk'
insert into tb select 12,2,'ll'
insert into tb select 13,2,'mm'
insert into tb select 14,3,'nn'
insert into tb select 15,3,'oo'
go
update b set BB=a.bb 
from tb a inner join tb b on a.AA=b.AA and a.AUTOID<b.AUTOID 
inner join (select MIN(autoid)autoid,aa from tb group by AA)c
on c.AA=b.AA and (a.AUTOID-c.autoid)/3=(b.AUTOID-c.autoid)/3
select * from tb
/*
AUTOID      AA          BB
----------- ----------- ----------
1           1           aa
2           1           aa
3           1           aa
4           1           dd
5           1           dd
6           1           dd
7           1           gg
8           1           gg
9           2           ii
10          2           ii
11          2           ii
12          2           ll
13          2           ll
14          3           nn
15          3           nn

(15 行受影响)

*/
go
drop table tb