i have two tables like the one below i want the table to show what is in table 1 and not in table 2 only. the table value changes always so i can not just write down 1 as the result

id number
1 4
2 4
3 5
4 1
5 5

table 2
id number
1 4
2 4
3 4
4 5
5 5


what i am trying to do is to creat PEOPLE YOU MAY KNOW script like facebook, i have been able to get a user-A friend list, and friends of friend of user-A list as well, so now i want to remove user-A friend list from Friends of friend user-A list so that it does not show me people that are aleady my friend.
for those that does not understand please just solve the question above for me i think i can figure out the rest or if you have already made script, it would be very appreaciated

thank you in advance