Question

I have a table called Users in my database. A user can have multiple addresses, but in some cases they won’t have any. My mysql link statement is only returning records which have at least one address:

$query = ' SELECT DISTINCT a.id FROM users as a, addresses as b' ;
$query.= ' WHERE a.id = b.userId ' ;

How can I alter this so that users with no addresses will still be returned?

I’m guessing theres a simple solution to this I’m just missing!

Thanks in advance.

Answer 1

Use LEFT JOIN instead:

SELECT DISTINCT a.id
FROM   Users a LEFT JOIN Addresses b
        on a.ID = b.UserID