SQL Count Query

[eluser]underskor[/eluser]
I am trying to retrieve all categories, and the number of posts in each category.

Code:

SELECT COUNT(blog_entries.post_id) AS post_count,
blog_categories.category_id, blog_categories.category_title, blog_categories.category_desc
FROM blog_categories, blog_posts
WHERE blog_posts.category_id = blog_categories.category_id
GROUP BY blog_categories.category_title

This works, but it only fetches the rows of categories which have posts under them. How do I return the categories which are empty as well?

Thanks