Question

Let’s say I have:

   SELECT bloggers.*, 
          COUNT(post_id) AS post_count
     FROM bloggers 
LEFT JOIN blogger_posts ON bloggers.blogger_id = blogger_posts.blogger_id
 GROUP BY bloggers.blogger_id
 ORDER BY post_count

That returns all bloggers ordered by their post count.
What if I want just some bloggers but still ordered by the same criteria (for example those whose AUX field is equal to 3)?

Answer 1

The WHERE clause should come immediately before the GROUP BY clause. When in doubt about something as straightforward as syntax, the place to look is the manual.

MySQL Manual :: SELECT Syntax

   SELECT bloggers.*, 
          COUNT(post_id) AS post_count
     FROM bloggers 
LEFT JOIN blogger_posts ON bloggers.blogger_id = blogger_posts.blogger_id
    WHERE bloggers.AUX = 3
 GROUP BY bloggers.blogger_id
 ORDER BY post_count