Answer:
timer interrupt
Explanation:
A timer is an interrupt that is generated by the PC's system timer.When this interrupt occurs, the ROM BIOS interrupt handler is called and it increments a count in the ROM BIOS.It interrupts the system 18.2 times per second.It is used for multitasking.Hence we conclude that timer interrupt is the answer.
Answer:
SQL injection is a form of hacking that uses user input fields.
Explanation:
SQL injection is when a piece of code or entire algorithm is input where a program prompts for user input. They can be used to change or access data. To prevent this, a programmer should scrub inputs. Scrubbing data removes slashes and arrows, which or commonly used in code.
Answer:
The trigger code is given below
create trigger F1_Del
after delete on Friend
for each row
when exists (select * from Friend
where ID1 = Old.ID2 and ID2 = Old.ID1)
begin
delete from Friend
where (ID1 = Old.ID2 and ID2 = Old.ID1);
end
create trigger F1_Insert
after insert on Friend
for each row
when not exists (select * from Friend
where ID1 = New.ID2 and ID2 = New.ID1)
begin
insert into Friend values (New.ID2, New.ID1);
end
