Mutual friends sql with join (Mysql)

Question

I have two tables

users table:

id|name

user_relationships

id | user_id | friend_id

and want to ge

Answer 1

SELECT id, name
FROM users
WHERE id IN (
  SELECT friend_id
  FROM user_relationships
  WHERE user_id IN ( 1, 2 )
  GROUP BY friend_id
  HAVING COUNT(friend_id) >= 2
)

or with one join:

SELECT friend_id, name
FROM user_relationships r
  INNER JOIN users u ON r.friend_id = u.id
WHERE user_id IN ( 1, 2 )
GROUP BY friend_id
HAVING COUNT(friend_id) >= 2