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Sum of hrs using a virtual field?


mdav20
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I currently have a calculated field on a details report that sums up the a total hrs field in a table.

This is the current formula and it works perfect...

select sum(hrs_total) from tire_hrs_table where tire_id=target.[@field:tire_id]

 

My problem is the hrs_total is the sum of [hrs_removed] - [hrs_installed] of only completed transactions and not currently open transactions.  Every record has a hrs_installed but open transactions do not have a hrs_removed yet. 

 

I would like to add a virtual field for [current_hrs] to my details report which would allow the user to input the current hours.  Then I need to take the virtual field [current_hrs] and subtract [hrs_installed] from records that do not have [hrs_removed] yet to figure out how many hours are on the open transaction currently and then add that to my formula i already have working. 

 

 

Not sure if I would use a CASE statement or how to use it.

 

Hopefully that kinda makes sense.

 

thanks for any help you guys can give

 

 

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