Stop duplicate rows in dynamic drop down - php

Question

I have two tables, users and lifts.
On my UI (php webpage), I have two drop downs (as well as others, irrelevant), one drop down is [userlastname, userfirstname], and the other is [destination]
the query i am using is this:
SELECT * FROM lifts l JOIN users u ON l.user_id=u.uid GROUP BY l.id;
which gives me the list of usernames in users (correctly)
[Harvey Fletcher]
[Ronald McDonald]
[Harvey Fletcher]
and also a list of all destinations
[Destination 1]
[Destination 2]
[Destination 3]
But as you can see from the usernames list, [Harvey Fletcher] has appeared twice. How can I stop this from happening? Table structure below.
Users:
+---------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------------+--------------+------+-----+---------+----------------+
| uid | int(10) | NO | PRI | NULL | auto_increment |
| title | varchar(10) | NO | | NULL | |
| firstname | varchar(100) | NO | | NULL | |
| lastname | varchar(100) | NO | | NULL | |
| email | varchar(500) | NO | | NULL | |
| password | varchar(500) | NO | | NULL | |
| reg_no | varchar(10) | YES | | NULL | |
| vehicle_make | varchar(50) | YES | | NULL | |
| vehicle_colour | varchar(25) | YES | | NULL | |
| licence_no | varchar(50) | YES | | NULL | |
| address_line1 | varchar(75) | NO | | NULL | |
| address_line2 | varchar(75) | NO | | NULL | |
| town_city | varchar(75) | NO | | NULL | |
| postcode | varchar(10) | NO | | NULL | |
| reputation_positive | int(10) | YES | | 0 | |
| reputation_negative | int(10) | YES | | 0 | |
| telephone_number | char(11) | NO | | NULL | |
+---------------------+--------------+------+-----+---------+----------------+
Lifts:
+-----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+----------------+
| id | int(10) | NO | PRI | NULL | auto_increment |
| user_id | int(10) | NO | | NULL | |
| lift_to | varchar(50) | NO | | NULL | |
| lift_from | varchar(50) | NO | | NULL | |
| quote_price | varchar(50) | NO | | NULL | |
| available_seats | int(2) | YES | | 1 | |
| depart_date | varchar(20) | NO | | NULL | |
| depart_time | varchar(10) | NO | | NULL | |
| pickup_location | varchar(100) | NO | | NULL | |
+-----------------+--------------+------+-----+---------+----------------+
Info:
Harvey Fletcher is only in users table once
Harvey Fletcher has two 'lifts', which is why it appears twice.
Ronald McDonald only has one, so only appears once, but if I added a second lift, would be displayed 2 times.

Answer 1

Group your query to users instead of lifts:
SELECT * FROM lifts l JOIN users u ON l.user_id=u.uid GROUP BY u.uid;