Answer Posted / ajaz ahmad

TRIGGER:- when button_pressed

declare
cursor c1 is select colum-name from table-name;
sum table-name%rowtype;
begin
sum := 0;

for z in c1 loop
if z.column-name < 0 then
null;
else
sum := NVL( sum + nvl(z.column-name),0);
end if;
end loop;
message('Sum of +ve Values is ='|| sum);
end;

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