Question

Basically,

I have two tables, one with Some posts on and another for comments, what I am trying to do is create a page with the most popular posts, I will render popular posts depending on how many comments it has.

Here’s the query I have so far

mysql_query("SELECT * FROM posts JOIN comments ON posts.id = comments.content_id ORDER BY count('comments.id') LIMIT 10");

But the count() is messing it up, could anyone help me? THANKS!

Answer 1

If you have an aggregate function, such as COUNT(*), you should include a GROUP BY clause:

Also, since you want to return posts with the most comments, you’ll want to sort by the count in descending order (highest to lowest).

SELECT 
    posts.id, 
    COUNT(comments.content_id) as post_comments 
FROM 
    posts 
    LEFT JOIN comments 
        ON posts.id = comments.content_id 
GROUP BY posts.id
ORDER BY post_comments DESC
LIMIT 10