Question

I’m working on a “Possible Friends” feature. where i need to show all the friends of friends who’s not my friend and also not send me or not having my pending request

FRIENDSHIPS
user_id
friend_id
status  (0 = pending, 1 = approved) 

For each friendship I make two records. Say users 1 and 2 become friends… I would make a record where user_id=1,friend_id=2 and another where user_id=2, friend_id=1 in the friendships table.

when first user send request, set status to 0 and when friend accept request then I would update both row with 1

How would I make a sql query that suggests “possible friends” based on friends of my friends ?

Answer 1

Here you go… simple join

SELECT F2.friend_id
FROM FRIENDSHIPS F
JOIN FRIENDSHIPS F2 ON F.friend_id = F2.user_id
WHERE F2.friend_id NOT IN (SELECT friend_ID FROM FRIENDSHIPS WHERE user_id = @user_id)
  AND F.user_id = @user_id