Correct way to do update?

Hi 

I'm trying to accomplish the following update. What is the correct and most efficient way to do this?

• I want to update #tmp2 with the price in #tmp
• Where the date in #tmp is equal to the date in #tmp2
• If there is no date then use the latest date from #tmp.

the two tables join on #tmp.pkiProdId = #tmp2.fkiProdID

create table #tmp (pkiProd int,dteDate datetime,numPrice decimal (18,2))
insert into #tmp select 1,'2013-01-01',1
union all
select 1,'2013-01-02',1.5
union all 
select 1,'2013-01-03',1.7
union all 
select 1,'2013-01-04',1.9
union all 
select 1,'2013-01-05',2
union all 
select 1,'2013-01-06',2.4
union all 
select 1,'2013-01-07',3.4


create table #tmp2 (pkiTransID int identity, fkiProdID int,dteDate DATETIME,numPrice DECIMAL (18,2))
insert into #tmp2 (fkiProdID,dteDate)
select 1,'2013-01-02'
union all
select 1,'2013-01-05'
union all 
select 1,'2013-01-09'

update #tmp2
set numPrice = #tmp.numPrice
from #tmp inner join #tmp2 on (#tmp.pkiProd = #tmp2.fkiProdID)
where #tmp2.dteDate = #tmp.dteDate or #tmp.dteDate < #tmp2.dteDate --?

select *from #tmp2

drop table #tmp
drop table #tmp2