MySQL - Get most "liked" users in the past month

Question

I have a "like" system on a community forum. All internal likes are stored in a database called log_like.

CREATE TABLE `log_like` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `id_member` mediumint(8) NOT NULL,
  `id_message` int(10) NOT NULL,
  `id_poster` mediumint(8) NOT NULL DEFAULT '0',
  `time` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  KEY `id_member` (`id_member`),
  KEY `id_message` (`id_message`)
) ENGINE=MyISAM;

I need to get the last month most liked member ID's (id_poster field in the DDL above). So I probably need to GROUP and COUNT how many times the same "id_poster" appears in records of the past month. I want to LIMIT it to the 10 most liked. The field "time" stores the unix time for reference.

Unfortunately, I have no idea how to achieve this. Can anyone help?

Answer 1

So, here is what I ended up with:

SELECT 
  id_poster, 
  COUNT(1) AS like_count
FROM 
  log_like
WHERE 
  time BETWEEN UNIX_TIMESTAMP('2012-11-01') AND UNIX_TIMESTAMP('2012-12-01')
GROUP BY 
  id_poster
ORDER BY 
  like_count 
DESC
LIMIT 10

This way I get the past month (November 2012) top result, instead of the past 30 days from now as suggested before. (Big thanks goes to Barmar for all the work)

Answer 2

select id_poster, count(*) like_count
from log_like
where time > unix_timestamp(date_sub(now(), interval 1 month))
group by id_poster
order by like_count desc
limit 10

It would be best if you had an index on id_poster.

Answer 3

SELECT DISTINCT id, count(*) as '#oflikes' from log_like
WHERE 
  time BETWEEN UNIX_TIMESTAMP('2012-11-01') AND UNIX_TIMESTAMP('2012-12-01')
LIMIT 10;