mysql friendlist table structure - php

Question

I created an app and I want to add the feature that users can add other users to their "friend list".
I dont know how to create a mysql table to store this data, is this a good structure:
A table with 2 rows, one unique row "user" and one "friends", and in the friends row I will add the usernames of the friends like "John, Thomas, Sam, Peter".
And when I want to display the friend list, I will just search for the "user" and display all entries from "friends" row.

Answer 1

The best solution would be to make two tables.
CREATE TABLE IF NOT EXISTS `users` (
`user_id` int(10) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
CREATE TABLE IF NOT EXISTS `friends` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`user_id` int(10) NOT NULL,
`friend_id` int(10) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
If you want to add a friend just add the unique user id from users table and the person who you want to be friends with on the friends table.
If you want to get all the friends:
SELECT `users`.`username` FROM `friends` LEFT JOIN `users` ON `friends`.`friend_id` = `users`.`user_id` WHERE `friends`.`user_id` = '1' // with specific user id
It will return the friends of user_id 1
$rs=$conn->query("SELECT `users`.`username` FROM `friends` LEFT JOIN `users` ON `friends`.`friend_id` = `users`.`user_id` WHERE `friends`.`user_id` = '1'");
$arr = $rs->fetch_all(MYSQLI_ASSOC);
foreach($arr as $row) {
echo $row['username'];
}