sql-server - SQLクエリの内部結合とcase文にpartition byとrow_number()を適用する方法

Question

SQLクエリがあります

select b.logtime,
       b.beam_current,
       b.beam_energy,
       case when a.st2_vs2_bag1_onoff=0 then c.st2_vs2_bag1_rb ELSE 0 END
         as st2_vs2_bag1_rb,
       CASE when a.st2_vs2_bag8_onoff=0 then c.st2_vs2_bag8_rb else '0' END
         as st2_vs2_bag8_rb,
       CASE when a.st2_vs2_bag9_onoff=0  then c.st2_vs2_bag9_rb else '0' END
         as st2_vs2_bag9_rb 
from   INDUS2_BDS.dbo.DCCT b
       INNER JOIN (
         INDUS2_VACUUM.dbo.main_vacuum_analog c
         inner join INDUS2_VACUUM.dbo.main_vacuum_status a
           on c.logtime=a.logtime
       )
       ON a.LOGTIME = b.LOGTIME
         and (b.beam_current like '%9.96' etc)
         and b.logtime between '2014-08-09 00:00:00' and '2014-08-09 23:59:59'
         and b.beam_current in('10.01', '20.02', etc)
         and ( b.beam_energy between '550' and '551' )
order by b.logtime 

現在、指定された logtime で、単一の beam_current 値が異なる logtime で複数回来ています。それを適用する方法。