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Calculating the Difference Between Numbers in Consecutive Records

I have a report with data similar to this format:

Customer       Mileage
500                 1000
500                 2000
500                 2200
500                 2500

What need help doing is calculating the difference between the mileages, so it would look like this:

Customer       Mileage        Difference
500                 1000              0                 (since there is nothing to subtract from)
500                 2000              1000            (2000 - 1000)    
500                 2200              200               (2200 - 2000)
500                 2500              300               (2500 - 2200)

I can't seem to figure out how to get that difference to calculate.

Thank you for your help!

0
leesmithinc
Asked:
leesmithinc
1 Solution
 
bdreed35Commented:
You can write a formula like this to get the difference:

whileprintingrecords;
if not onfirstrecord
then {table.mileage} - previous({table.mileage})
else 0
0
 
leesmithincAuthor Commented:
That worked great.  Thanks!
0
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