create table tb(单号 int,条码 varchar(10),送修时间 datetime,维修完成时间 datetime)
insert into tb select 1,'A','2011-10-9','2011-10-10'
insert into tb select 2,'A','2011-10-15','2011-10-31'
insert into tb select 3,'A','2011-12-16','2011-12-30'
insert into tb select 4,'B','2011-9-10','2011-9-15'
insert into tb select 5,'B','2011-11-10','2011-11-20'
insert into tb select 6,'C','2011-12-1','2011-12-3'
insert into tb select 7,'C','2011-12-5','2011-12-6'
go
select row_number()over(partition by 条码 order by 送修时间)序号,* from tb
/*
序号                   单号          条码         送修时间                    维修完成时间
-------------------- ----------- ---------- ----------------------- -----------------------
1                    1           A          2011-10-09 00:00:00.000 2011-10-10 00:00:00.000
2                    2           A          2011-10-15 00:00:00.000 2011-10-31 00:00:00.000
3                    3           A          2011-12-16 00:00:00.000 2011-12-30 00:00:00.000
1                    4           B          2011-09-10 00:00:00.000 2011-09-15 00:00:00.000
2                    5           B          2011-11-10 00:00:00.000 2011-11-20 00:00:00.000
1                    6           C          2011-12-01 00:00:00.000 2011-12-03 00:00:00.000
2                    7           C          2011-12-05 00:00:00.000 2011-12-06 00:00:00.000

(7 行受影响)

*/
go
drop table tb

------解决方案--------------------
SQL code
新增列时

--> --> (Roy)生成測試數據
 
if not object_id('Tempdb..#T') is null
    drop table #T
Go
Create table #T([单号] int,[条码] nvarchar(1),[送修时间] Datetime,[维修完成时间] Datetime)
Insert #T
select 1,N'A','2