I am working on a database that control a fuel tank.
Every record show the input or output of litres that is done on the tank.
I have done a form to quick access and entry data.
But i would like to add on that form a field that show the real amoun...
I mean, i have a fuel tank. It only have a counter that shows the total of litres that have been extracted from the tank.
First day , i fill it with 1000 litres (for example).
After this, i have a web form where my users fill it with the data of e...