many to many mysql with tricky condition - mysql

Question

Please, check my tables below
users
id name
1 John
2 Peter
3 Predator
phones
id name
1 apple
2 nexus
3 nokva
phones_users
phone_id user_id
1 1
2 1
2 2
3 3
sqlfiddle
Ok, I want to get a result like this:
phone_id phone_name user_id user_name
1 apple 1 John
2 nexus 1 John
2 nexus 2 Peter
I tried one request, but it doesn't work expectedly
select `phones`.`name` as `phone_name`, `phones`.`created_at`, `phones`.`id`, `users`.`name` as `user_name`, `users`.`id` as `user_id` from `phones` left join `phones_users` on (`phones`.`id` = `phones_users`.`phone_id` and `phones_users`.`user_id` = 1) left join `users` on `phones_users`.`phone_id` = `phones`.`id` where `users`.`name` is not null;
I want to get all the phones that have the user with ID = 1, and all users who have phones that belonged to him..
For example, John has apple and nexus and Peter has nexus, I want to get a table with apple, nexus, John, Peter.
THANKS

Answer 1

I attached a copy of phones_users and used IF to distinguish, whether the phone belongs to the same person or not. Based upon that I output the user name and id.
SELECT
`phones_users`.`phone_id`,
`phones`.`name` AS phone_name,
IF(`users`.`id` = `users2`.`id`, `users`.`id`, `users2`.`id`)
AS `user_id`,
IF(`users`.`id` = `users2`.`id`, `users`.`name`, `users2`.`name`)
AS `user_name`
FROM
phones_users
INNER JOIN
phones
ON
phones_users.phone_id=phones.id
INNER JOIN
users
ON
phones_users.user_id=users.id
INNER JOIN -- here I attach the copy of the table
phones_users AS phones_users2
ON
phones_users.phone_id=phones_users2.phone_id
INNER JOIN
users AS users2
ON
phones_users2.user_id=users2.id
WHERE
phones_users.user_id=1;
Output:
+----------+--------------+---------+-----------+
| phone_id | phone_name | user_id | user_name |
+----------+--------------+---------+-----------+
| 1 | apple iphone | 1 | John |
| 2 | nexus | 1 | John |
| 2 | nexus | 2 | Peter |
+----------+--------------+---------+-----------+

Answer 2

-- We know the user details for this part of the query, so just hard-code them instead of query for them
SELECT phone_id, (SELECT name FROM phones WHERE id = pu.phone_id) AS phone_name, 1 AS user_id, "John" AS user_name
FROM phones_users pu
WHERE phone_id IN (SELECT phone_id
FROM phones_users
WHERE user_id = 1)
UNION ALL
SELECT p.id AS phone_id, p.name AS phone_name, u.id AS user_id, u.name AS user_name
FROM phones p, user u
WHERE u.id IN (SELECT user_id
FROM phones_users
WHERE user_id != 1
AND phone_id IN (SELECT phone_id FROM phones_users WHERE user_id = 1))
AND u.id = (SELECT user_id
FROM phones_users
WHERE phone_id = p.id)
Transcribed to English:
Select the phone_id from the table phones_users where this id is in the list of ids of phones used by John and the name of the phone with this id and the values 1 (the ID of John) and his name, "John".
Then, append to that (here it starts to get even more complicated):
the phone id and name and user id and name from the rows resulting from joining the tables phones and users, but only on the rows satisfying the following constraints:
The user id of the row is in the list of user ids of users whose phone's id is the same as the id of the phone John (the user with id 1) uses, i.e. this user is not John but uses the same phone as John,
and the user id is in the list of user ids that are in the table phones_users in the same row as the phone id of the joined row, i.e. this user does indeed use this phone (joining the tables phones and users will give all possible combinations, so we have to remove the rows in which people are with phones they don't use).
I hope you can understand the transcription and the query, if not feel free to leave a comment.
DISCLAIMER: I didn't test the query, it may not work.