&& opening stock table create cursor open_stock (dates d(8),codes c(4),products c(15),qty n(3),sold n(3),rate n(8,2),amount n(9,2)) insert into open_stock values({^2010-07-01},'1401','Hard Disk',1,0,1100,0) replace all amount with qty*rate && purchase table create cursor purchase (dates d(8),codes c(4),products c(15),qty n(3),sold n(3),rate n(8,2),amount n(9,2)) insert into purchase values({^2010-07-01},'1401','Hard Disk',2,0,1200,0) insert into purchase values({^2010-07-02},'1401','Hard Disk',3,0,1300,0) insert into purchase values({^2010-07-03},'1401','Hard Disk',4,0,1400,0) insert into purchase values({^2010-07-03},'1401','Hard Disk',8,0,1500,0) replace all amount with qty*rate && sale table create cursor sales (dates d(8),codes c(4),products c(15),qty n(3)) insert into sales values({^2010-07-01},'1401','Hard Disk',2) insert into sales values({^2010-07-04},'1401','Hard Disk',5)It display following result as figure 1