Question

I have posts table. Each post has topic_id field which corresponds to the appropriate id field in topics table.

I need to sort topics by the date_created field in posts table.

Also, each topic has forum_id and I need to show and sort only topics with particular forum_id.

I tried something like this:

SELECT 
   topics.id, topics.title 
FROM 
   topics RIGHT JOIN posts ON topics.id = posts.topic_id
WHERE 
   topics.forum_id = 1 
ORDER BY 
   posts.date_created DESC

However not every topic has posts associated with it. Those that do not have any posts are not returned.

How to fix it?

Answer 1

Try using LEFT JOIN instead of RIGHT JOIN