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Occupancy with two dates

Hi all,

I'm try to calculate the occupancy of a car park each hour of the day.  I can calculate the information easily enough in Excel as it is just Entries before time X less Exits before time X.  I get the results as below.


The data I'm using has the following headers, VRM, DurationSeconds, EntryTime, ExitTime.

To calculate the occupancy in Qlik I was trying to use Hour(EntryTime) as my dimension and count(EntryTime) - count (ExitTime) as my measure but the results always show as 0 for obvious reasons.

Does anyone know of a solution?