How to avoid “Using temporary” in many-to-many queries?

Question

This query is very simple, all I want to do, is get all the articles in given category ordered by last_updated field:

SELECT
    `articles`.*
FR         


        

Answer 1

I assume you have made the following in your db:

1) articles -> id is a primary key

2) articles_to_categories -> article_id is a foreign key of articles -> id

3) you can create index on category_id