如何去掉部分字段重复数据？

--0. 定义表变量及初始数据
set nocount on
declare @t table(
	mobile varchar(11),
	loadTime datetime
)
--1   单条　
--2,3 两条，号码和时间完全相同
--4,5 两条，号码同，时间不同
insert into @t (mobile, loadTime) values('13212345670','2014-04-05')
insert into @t (mobile, loadTime) values('13212345671','2014-03-02')
insert into @t (mobile, loadTime) values('13212345671','2014-03-02')
insert into @t (mobile, loadTime) values('13212345672','2014-02-03')
insert into @t (mobile, loadTime) values('13212345672','2014-03-04')

--1. row_number 同一号码，无论时间是否相同 rid都不会重复
select row_number() over(partition by mobile order by loadtime) as rid, * from @t ORDER BY mobile,loadTime
/*
                 rid mobile      loadTime
-------------------- ----------- -----------------------
                   1 13212345670 2014-04-05 00:00:00.000
                   1 13212345671 2014-03-02 00:00:00.000
                   2 13212345671 2014-03-02 00:00:00.000
                   1 13212345672 2014-02-03 00:00:00.000
                   2 13212345672 2014-03-04 00:00:00.000
*/
--2. rank 同一号码, 同一时间 rid会重复; 同一号码 不同时间 rid 不会重复
select rank() over(partition by mobile order by loadtime) as rid, * from @t ORDER BY mobile,loadTime
/*
                 rid mobile      loadTime
-------------------- ----------- -----------------------
                   1 13212345670 2014-04-05 00:00:00.000
                   1 13212345671 2014-03-02 00:00:00.000
                   1 13212345671 2014-03-02 00:00:00.000
                   1 13212345672 2014-02-03 00:00:00.000
                   2 13212345672 2014-03-04 00:00:00.000
*/
--3. 只能选择 row_number 来去重复……
;with t as (
	select row_number() over(partition by mobile order by mobile,loadtime) as rid, * from @t
)
select * from t where rid=1  ORDER BY mobile,loadTime
/*
                 rid mobile      loadTime
-------------------- ----------- -----------------------
                   1 13212345670 2014-04-05 00:00:00.000
                   1 13212345671 2014-03-02 00:00:00.000
                   1 13212345672 2014-02-03 00:00:00.000
*/