MySQL Query to find friends and number of mutual friends

Question

I have looked through the questions but I cant find anything that does exactly what I need and I can\'t figure out how to do it myself.

I have 2 tables, a user table

Answer 1

This query lists anyone who's not friend with user 1 and whose surname matches '%bloggs%':

SELECT
  users.user_id,
  users.first_name,
  users.surname,
  Sum(IF(users.user_id = friend_links_1.friend_id, 1, 0)) As mutual
FROM
  users inner join
    (friend_links INNER JOIN friend_links friend_links_1
     ON friend_links.friend_id = friend_links_1.user_id)
  ON friend_links.user_id=1 AND users.user_id<>1
WHERE
  users.surname LIKE '%bloggs%'
GROUP BY
  users.user_id, users.first_name, users.surname
HAVING
  Sum(IF(users.user_id = friend_links.friend_id, 1, 0))=0

just change the user id on the ON clause, and the surname on the WHERE clause. I think it should work correctly now!