Maybe I do not understand SQL well enough, but I have a problem.
I have a table for fuel that I buy as well as the odometer reading 
when it is bought. I would like to calculate the fuel economy 
(quantity of fuel divided by the distance traveled). How do I 
subtract the odometer readings from adjacent rows to get the distance 
traveled? I have a few other databases which require subtracting one 
row of a field from other row.

Dan

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