Question

Using mysql

DB design:

Users:
- userId
- userName

Posts:
- postId
- text

UserPosts (many-many):
- userId (FK)
- postId (FK)

I want to retrieve all the posts made by all the users. This is what I need:

- userName
- text

I’m not quite sure how to write this query. How do I do this 3 way join ??

Answer 1

SELECT 
      u.userName, 
      p.Text
FROM 
      UserPosts up 
INNER JOIN
      Users u 
ON  
      u.userID = up.userID
INNER JOIN 
      Posts p ON p.postID = up.postID