openvk/Web/Models/sql/get-online-friends.tsql

  (SELECT DISTINCT(follower) AS __id FROM
    (SELECT follower FROM subscriptions WHERE target=? AND model="openvk\\Web\\Models\\Entities\\User") u0
    INNER JOIN
    (SELECT target FROM subscriptions WHERE follower=? AND model="openvk\\Web\\Models\\Entities\\User") u1
  ON u0.follower = u1.target) u2
INNER JOIN profiles ON profiles.id = u2.__id WHERE online > (UNIX_TIMESTAMP() - 300)