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Paulo_IntelFab
Contributor III
Contributor III

How to update a column on a previous row?

Hi, guys. 
 I need to set the downtime value of a machine according to the time where the machine stop occurred. 
 My table is something like this:

Shift Interval Interval Downtime
1 12 07:34:34 0
2 1234 14:12:12 398


In this case, I need to split the downtime between Shifts 1 and 2 (because most of time stopped was on Shift 1). 
The expected values are something like this:

Shift Interval Interval Downtime
1 12 07:34:34 386
2 1234 14:12:12 12

 

How can I, detecting this change of Shift (using Previous(Shift), update the last row of the Shift 1? 
I appreciate any help. 

This is the same question I posted in other forum (but here it looks more suitable). 

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