Calculating total hours worked?

I am trying to calculate the total hours worked per individual but I'm unsure how to do this with a query.

For instance, Table 1 may look like this:

ID         EmployeeID             DTStart                                DTEnd                                 Total Hours?
1          1234                      15/08/2010 11:30:00            15/08/2010 18:45:00
2          5678                      16/08/2010 08:45:00            16/08/2010 18:45:00
3          5678                      16/08/2010 22:10:00            17/08/2010 02:30:00
4          3456                      16/08/2010 22:00:00            16/08/2010 23:30:00
5          5678                      18/08/2010 18:00:00            19/08/2010 01:30:00


If for example I wanted to know the total hours for employee 5678, how could I work this out in an access query?  I need two results, the first, total hours each instance, and the second total hours combined for each employeeID?

Any ideas would be greatly appreciated thanks,

Jon
JonB1984Asked:
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Patrick MatthewsCommented:
Assuming DTStart and DTEnd are both using date/time data type, in Access:
SELECT EmployeeID, Sum(DTEnd - DTStart) * 24 AS HrsWorked
FROM [Table 1]
GROUP BY EmployeeID

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JonB1984Author Commented:
This works brilliantly for the first part of my question and I can get the rest sorted myself now.

Thanks,

Jon
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