SQL疑难问题---请高手帮忙
大家好:
sql菜鸟遇到这样一个问题,就是在表#t1中每一个fcardnumber对应多条记录,其中每条记录的funitnumber不同。
现在想出这样的结果:每个fcardnumber一条记录,按照ftime排序,将最近的两条记录的funitnumber列出。
--drop table #t1
create table #t1
(
fid int identity(1,1),
fcardnumber varchar(10),
funitnumber varchar(10),
ftime datetime not null
)
go
insert into #t1 select 'Card001','Unit003','2012-04-05 08:03:12.350'
insert into #t1 select 'Card001','Unit002','2012-03-15 08:13:15.730'
insert into #t1 select 'Card001','Unit001','2012-02-25 08:15:18.130'
insert into #t1 select 'Card002','Unit005','2012-04-05 08:03:12.350'
insert into #t1 select 'Card002','Unit003','2012-03-15 08:13:15.730'
insert into #t1 select 'Card002','Unit002','2012-02-25 08:15:18.130'
insert into #t1 select 'Card002','Unit004','2012-01-25 08:15:18.130'
希望最终的结果是这样的:
Card001 Unit003 Unit002
Card002 Unit005 Unit003
恳请帮忙,谢谢~~~
[解决办法]
create table #t1(fid int identity(1,1),fcardnumber varchar(10),funitnumber varchar(10),ftime datetime not null)goinsert into #t1 select 'Card001','Unit003','2012-04-05 08:03:12.350'insert into #t1 select 'Card001','Unit002','2012-03-15 08:13:15.730'insert into #t1 select 'Card001','Unit001','2012-02-25 08:15:18.130'insert into #t1 select 'Card002','Unit005','2012-04-05 08:03:12.350'insert into #t1 select 'Card002','Unit003','2012-03-15 08:13:15.730'insert into #t1 select 'Card002','Unit002','2012-02-25 08:15:18.130'insert into #t1 select 'Card002','Unit004','2012-01-25 08:15:18.130';with tas(select fcardnumber,funitnumber from(select *,ROW_NUMBER()over(partition by fcardnumber order by ftime desc) as row_numfrom #t1)a where row_num<=2)select fcardnumber,REPLACE(funitnumber,'<',' ') as funitnumber from(SELECT *FROM (SELECT DISTINCT fcardnumber FROM t)AOUTER APPLY( SELECT funitnumber= STUFF(REPLACE(REPLACE( ( SELECT funitnumber FROM t N WHERE fcardnumber = A.fcardnumber FOR XML AUTO ), '_x0023_t1 funitnumber="', ''), '"/>', ''), 1, 1, ''))N)a/*fcardnumber funitnumberCard001 Unit003 Unit002Card002 Unit005 Unit003*/
[解决办法]
你的 库版本估计不是 SQL 2008 或2005.如果是的话,执行是没有问题的。