Calculating Time Difference From The Record Above

Nov 12, 2007

I need help to calculate time difference from the record above where ID is same. I have attached an example in excel with this request where I have if statement doing exacly what I want to do in Access. I have a table in Access that has three columns - as below

ID, Reg, TimeDiff
66646, 14/06/2007 21:33,
66646, 15/06/2007 06:03, 8:30:00
66646, 15/06/2007 12:20, 6:17:00
66646, 15/06/2007 15:08, 2:43:00
67844, 14/06/2007 04:39,
67844, 14/06/2007 09:05, 4:26:00
67844, 14/06/2007 09:08, 0:03:00
67844, 14/06/2007 16:27, 4:09:00

If ID is equal to the ID in record above then TimeDiff is equal to reg minus reg in the above recored, else blank.

Hope someone can help me with this.

Thanks, GS

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Hi, I wonder if someone can help me with the following problem:

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