The other thing this community will agree on @OwenAuger's solutions definitely do not fall in the "dime a dozen" category!
BTW Owen's sample file above includes Marcel's solution as well @MarcelBeug
@brett_waltonyou can create the Device table in Owen's solution in the Query Editor
Duplicate the table that has ALL Devices (right-click the table)
Remove All Other Columns
Remove Duplicates (right-click the column)
Close and Apply
Thank you .. Will give it a try but for point of clarity of what I am looking for the second one is Rob . The transaction was at 10:13 and he logged into the device at 10:00 so it was he who posted it not SAM .
Date Time Device
Example : 1/1/17 08:10:53 RFGN3550
1/1/17 10:13:40 RFGN3560
I have a device Log table that says who was logged into that device
Log in Date Time Device Person
Example: 1/1/17 08:00:00 RFGN3550 BOB
1/1/17 09:00:00 RFGN3550 MARY
1/1/17 09:00:00 RFGN3560 SAM
1/1/17 10:00:00 RFGN3550 ROB
Sam is the only one logged in device 3560!
Maybe you meant to have Rob log in device 3560 - but as you've written it the second should be Sam
Thank you Owen, that worked well. I perferred the DAX solution over M as I actaully understand what you did. (work for a smaller company so I am not a full time data person) .
One other huddle I need to cross
If I have a transaction at 1/27/17 @ 00:10:00 AM AND the log in record am looking for is 1/26/17 22:40:00 (so they logged in the previous day) - is there another condition I can add to this to account for that ?
Thank You Again
I suspect you've modified @OwenAuger's formula to only look at your Time columns!
Note that he checks a Date/Time column.
So to address this create a Date-Time Column in both tables like this
Date-Time = [Date]&" "&[Time]
Both of these columns will default to Text - so you need to convert them to Data Type - Date/Time - again in both tables.
This should resolve it!