Question

I have two table like following ones:

users
-----
id | name
_________
 1 | mert
 2 | ersin
 3 | faruk

friends
-------
id | follower | following
_________________________
1  |    2     |    3     |
2  |    3     |    1     |
__________________________

I want to find people who don’t follow the selected person.

For example:

get_people_not_follow(2) // "ersin"
Result: array(array(1, 'mert'), array(3, 'faruk'));

get_people_not_follow(1) // "mert"
Result: array(array(2, 'ersin'));

Thanks for your help.

Answer 1

SELECT users.id, name
FROM users LEFT JOIN friends ON (following = users.id AND follower = ##)
WHERE friends.id IS NULL

Where ## is the ID you are interested in.