Question : Microsoft Access DSum over Multiple Criteria

I am trying to get a running total using the DSum function in Microsoft Access.

My table and what I want the RunSum to look like is this:
SchedID EmpNum  SchedDate  Hrs  RunSum
11600    100          08/01/07      8     8
11601    100          08/02/07      8     16
11602    100          08/03/07      8     24
11603    200          08/01/07      8     8
11604    200          08/02/07      8     16
11605    200          08/03/07      0     16
11606    200          08/04/07      8     24

I have been trying to use the following query:
UPDATE tblTimeCombined SET tblTimeCombined.HrsTot = DSum("Hrs","tblTimeCombined","[EmpNum]<= '" & [EmpNum] & "' AND [SchedID]<= " & [SchedID] & "");

This is what it does:
SchedID EmpNum  SchedDate  Hrs  RunSum
11600    100          08/01/07      8     8
11601    100          08/02/07      8     16
11602    100          08/03/07      8     24
11603    200          08/01/07      8     32
11604    200          08/02/07      8     40
11605    200          08/03/07      0     40
11606    200          08/04/07      8     48

All it does is keep the running sum going.  I want a running sum for each record of the EmpNum.

SchedID is the primary key of tblTimeCombined

Any idea on how I can do this?

Thanks.

Answer : Microsoft Access DSum over Multiple Criteria

In your original query, use this criteria:

    "[EmpNum] = '" & [EmpNum] & "' AND...

= and not <=

Cheers!
(°v°)