Mysql joining derived tables - mysql

Question

This is one where I'm not sure if there is a better approach or not. maybe I just have a syntax error that I'm not seeing. either way here's the issue.
I am trying to get the number of my "friends" (defined by me following them and them following me ,join 1 creating a derived table) that are also following the object I'm looking at in the database. (join 2). this is in a custom function not a stored procedure so I can reuse it in several places. the only pertinant columns are profile_id and follower_profile_id. profile_id is the profile being followed, follower_profile_id is the one doing the following.
here is the query:
set followsThatCorrelate =
(
Select count(id)
from
(
select * from followers as shouldFollow
join
(
(select *
from followers
where followers.profile_id = authUserId
) as followingMe
join
(select *
from followers
where followers.follower_profile_id = authUserId
) as myFollows
on myFollows.profile_id = followingMe.follower_profile_id
) as friends1
on shouldFollow.follower_profile_id = friends1.follower_profile_id
where shouldFollow.profile_id = otherId
)
);
it says my syntax error is after I alias the derived table friends. no matter what I put after that it always throws the exception.

Answer 1

CREATE TABLE followers (
profile_id NVARCHAR(5),
follower_profile_id NVARCHAR(5)
);
INSERT INTO followers
VALUES ('Tom','Dick'),('Dick','Tom'),('Carry', 'Tom'),('Tom','Carry'),('John','Tom');
SET #authUserID = 'Tom';
SELECT followsme.follower_profile_id as followerID
FROM followers followsme
-- Join back to the followers table
INNER JOIN followers ifollow
-- get all of your followers followers
ON followsme.follower_profile_id = ifollow.profile_id
-- filter your followers followers to only you.
AND ifollow.follower_profile_id = #authUserId
-- this restricts the original set to only your followers
WHERE followsme.profile_id = #authUserId