DO SUM in SQL Server 2005

Hell Experts,

I have a table COMM,


EMpID      COMM        Datetime
------       --------        ----------------
101             10       10/01/2010 12:15 AM
102             10       10/01/2010 12:15 AM
101             50       10/01/2010 12:15 AM
101             10       10/02/2010 11:15 AM
102            50       10/02/2010  10:15 AM
101             10      10/02/2010    08:15 AM

I need SUM of COMM from COMM table for that EMPID and Update in another Table EMP

EMPID    Date                 COMM
-------    --------               ----------
101       10/01/2010           60
102       10/01/2010           10
101       10/02/2010            20
102       10/02/2010            50

Note: I need sum for the whole Day, for each EMPID.

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Muhammad Ahmad ImranDatabase DeveloperCommented:
select empid,sum(comm),datetime
from comm
group by datetime,empid
update E
set Comm =
from emp e
inner join (
select empid, datediff(d,0,datetime) dt, sum(comm) total
from comm
group by datediff(d,0,datetime)) c on c.empid=e.empid and c.dt =

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Microsoft SQL Server 2005

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