Real time ranking in mysql

Hello, I wanted to ask you guys how would you do this…
I have a site, that people can comment a post, each post will be stored in a mysql database and stored with a unix timestamp… (I use php+mysql).

Well, the idea is to create a real time ranking, for example, how could I know which are the most active posts in the last 24 hours? (the query should get the comments in the last 24 hours + order by the number of comments per post.
Database estructure:
24, 1, 2132135435, I like chocolate
24, 2, 2132135648, me too
24, 3, 2132135648, who doesn’t like chocolate??
25, 4, 32153553153, does anyone gone to ny??
25, 5, 3213213553, I have gone to NY!!
It should first extract all the comments in the last 24 hours, and after order by the number of comments per POST_ID and ORDER them in Descendent.

POST_ID: 24 (5 comments)
POST_ID:59 (4 comments)
POST_ID:13(2 comments)
POST_ID:10(1 comment)

Has anyone have any idea of the mysql query I should use?

Thank’s friends!
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Ioannis AnifantakisProgramming InstructorCommented:
select post_id, count(post_id) as totalposts
from mytable
group by post_id
order by count(post_id) desc

that will give you

post_id, totalposts

Just as you asked :)
Ioannis AnifantakisProgramming InstructorCommented:
Also, I forgot you want the today's results
So here it is taking care of the date as well

select post_id, count(post_id) as totalposts
from mytable
where date(unix_timestamp)=current_date
group by post_id
order by count(post_id) desc

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visionariAuthor Commented:
Thank's! works perfect!
Ioannis AnifantakisProgramming InstructorCommented:
no problem mate!
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MySQL Server

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