Subject how to calculate 2 records of the same column of a grid?
From Dirk <>
Date Tue, 12 Jan 2021 21:00:55 +0100
Newsgroups dbase.getting-started

i am trying to calculate 2 records of the same  column as excel, make a
sum in a calculated fields, by clicking on the grid cell

means want to know the consume of solar electricty in a certain period

i can of course use 2 colums , 2  fields : 1 begin and 1 end

but begin of column 1 day x, should be end of column end day - 15

day is date field i put the info into

so, to avoid a column i trying to find out a way as excel

thanks for a helping hand

best regards