SELECT users who have downvoted but never upvoted - php

Question

So, I thought I was getting pretty good at MySQL until I ran into this idea:
I have a table logging "votes" (aptly named votes) with these fields:
id: The vote's unique ID.
user: Unique User ID of the person who voted
item: ID of item they're voting on
vote: The vote they cast SET('up','down')
Now, I'm trying to come up with an SQL way to find users whose only votes are downvotes. I know of a way to write it procedurally in php after querying most of the data out of the table but it seems really, really inefficient to do that way when only a few queries could find this out.
Ideally I want my result to just be a list of users who have 0 upvotes (as being in the table means they have voted, so they only downvote) and maybe the number of downvotes they've cast.
Any ideas on how I should approach this?

Answer 1

SELECT user, SUM(IF(vote='down',1,0)) AS numDownVotes
FROM votes
GROUP BY user
HAVING SUM(IF(vote='up',1,0))=0 -- 0 upvotes
AND SUM(IF(vote='down',1,0))>0 -- at least 1 downvotes
I can't help but feel there's a neat GROUP BY user, vote way to do this though.

Answer 2

I haven't checked the syntax or anything, but this comes to mind...
SELECT user
FROM votes
GROUP BY user
HAVING SUM(IF(vote = 'up', 1, 0)) = 0
AND SUM(IF(vote = 'down', 1, 0)) > 0

Answer 3

select user, count(user)
from votes
where user not in (
select distinct user
from votes
where votes = 'up')

Answer 4

select v.user from votes v where
0=(select count(a.vote) from votes a where a.user=v.user and a.vote='up' group by user) u
and
0 <(select count(a.vote) from votes a where a.user=v.user and a.vote='down' group by user) d
group by user;

Answer 5

Anything wrong with doing it on the database call? Something like:
$query = "SELECT id FROM votes WHERE vote = 'down'";
$result = mysql_query($query);
while ($rows = mysql_fetch_assoc($result))
{
$curID = $rows['id'];
}

Answer 6

<?php
// Make a MySQL Connection
$query = "SELECT user, COUNT(user) FROM votes where vote == 'down' GROUP BY user";
$result = mysql_query($query) or die(mysql_error());
// Print out result
while($row = mysql_fetch_array($result)){
echo "User : ". $row['type'] ." has ". $row['COUNT(user)'] ." downvote/s.";
echo "<br />";
}
?>