Single SQL query on many to many relationship

Question

I have a simple database with few tables (and some sample columns):

Posts (ID, Title, Content)

Categories (ID, Title)

PostCategories (ID, ID_Post, ID_Category)

Is there a way to create single SQL query which will return posts with categories that are assigned to each post?

Answer 1

Simple joins work well.

SELECT posts.id, posts.title, categories.id, categories.title
FROM posts
JOIN posts_categories ON posts.id = posts_categories.post_id
JOIN categories ON posts_categories.category_id = categories.id

Answer 2

You can use the GROUP_CONCAT function

select p.*, group_concat(DISTINCT c.title ORDER BY c.title DESC SEPARATOR ', ')
from Posts p
inner join PostCategories pc on p.ID = pc.ID_Post
inner join Categories c on pc.ID_Category = c.ID
group by p.id, p.title, p.content