Subject how to calculate 2 records of the same column of a grid? From Dirk <dirk.cardoen1@gmail.com> Date Tue, 12 Jan 2021 21:00:55 +0100 Newsgroups dbase.getting-started Goodday, 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 Dirk